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TLF, Inc. Project No. 2023-119 Drainage Report for Carmel Clay Schools – Carmel High School Polytechnic Addition and Renovations 520 E. Main Street Carmel, Indiana 46032 September 20, 2023 Prepared by: TLF, Inc. 3901 West 86th Street, Suite 200 Indianapolis, IN 46268 Phone (317) 334-1500 Submitted by: Pete M. Rankovich, PE Herb Windhorst Page 1 of 71 TLF, Inc. Project No. 2023-119 Table of Contents Project Narrative I. Project Location II. Project Description III. Existing Drainage Conditions IV. Proposed Drainage Conditions V. Storm Sewer Design VI. Storm Water Detention VII. Storm Water Quality VIII. Summary and Conclusions Appendices Appendix A - Maps · Site Location Map – Exhibit A.1 · Soils Map and Data – Exhibit A.2 · Flood Insurance Rate Map – Exhibit A.3 Appendix B – Site Drainage Conditions · Existing Drainage Conditions – Exhibit B.1 · Existing Runoff Calculations HydroCAD Model – Exhibit B.2 · Proposed Drainage Conditions – Exhibit B.3 Appendix C - Proposed Storm Sewer Calculations · Rainfall Data – Exhibit C.1 · Inlet Basin Area Map – Exhibit C.2 · Rational Method Storm Sewer Calculations – Exhibit C.3 · Storm Sewer Structure Data Table – Exhibit C.4 · Casting Capacity Calculations – Exhibit C.5 · Hydraulic Grade Line Calculations – Exhibit C.6 Appendix D – Proposed Detention Calculations · Existing HydroCAD Model for Allowable Release Rates – Exhibit D.1 · Proposed HydroCAD Model – Exhibit D.2 · Outlet Control Structure Detail – Exhibit D.3 Appendix E - Proposed Water Quality Calculations · Water Quality HydroCAD Model – Exhibit E.1 · Water Quality Unit Selection Table – Exhibit E.2 · Water Quality BMP Detail – Exhibit E.3 Page 2 of 71 TLF, Inc. Project No. 2023-119 Project Narrative I. Project Location The proposed project is located at 520 East Main Street on the Carmel High School Campus, Carmel, Indiana per the Site Location Map – Exhibit A.1. The project area does not lie within a floodway or floodplain per FEMA panel 18057C0226G effective November 19, 2014 and the Flood Insurance Rate Map provided on Exhibit A.3 in Appendix A. II. Project Description The proposed project will take place on the west side of the existing High School building on the 38-acre Carmel High School Campus. The proposed site improvements will consist of a new 18,000 square foot construction, manufacturing and transportation building addition with associated site improvements and will disturb approximately 0.80 acres of land. As part of this project the associated infrastructure modifications include; a sanitary sewer main relocation, storm sewer main relocation and a new underground stormwater detention system. Additional utilities will be relocated to avoid new building construction. Existing Drainage Conditions The existing project area is comprised of 1.29 acres of impervious surfaces (parking lots, sidewalks and access drives) and 0.30 acres pervious areas (lawn and plantings in mulch beds). The site generally slopes from south to north. Stormwater runoff from the project site and adjacent areas drain to multiple storm sewers which come together at an existing manhole and 30” RCP located on the north side of the project area and then drains north to Cool Creek. See Existing Runoff Rates summary in Table 1 below and Existing Conditions Exhibit B.1 in Appendix B. Allowable release rates based on same area as proposed project area and are indicated in Table 2 below, see Exhibit D.1 Appendix D for calculations. Also see Proposed Conditions Exhibit B.3 in Appendix B. Table 1: Existing Runoff Rates Area (acres) 2-yr Runoff (cfs) 10-yr Runoff (cfs) 100-yr Runoff (cfs) Project Area 1.59 5.56 8.42 14.62 Table 2: Existing Runoff Rates for Determining Allowable Release Rates Area (acres) 2-yr Runoff (cfs) 10-yr Runoff (cfs) 100-yr Runoff (cfs) Project Area 1.36 4.76 7.20 12.51 Page 3 of 71 TLF, Inc. Project No. 2023-119 The site soils mainly consist of Crosby silt loam, fine loamy subsoil-Urban land complex and Miami silt loam-Urban land complex, see Soil Map and related soil data shown on Exhibit A.2 in Appendix A. III. Proposed Drainage Conditions The proposed building addition and the north side of the project site (1.36 acres) will be collected by proposed storm sewer and routed to a stormwater quality unit and then into an underground detention system and will include 0.793 acres of impervious area, 0.213 acres of pervious area and 0.354 acres of roof area. The west side of the project site (0.34 acres) will be collected by existing and proposed inlets draining to new storm sewers that will be connected to the existing 30” RCP without going through the proposed detention system. The proposed storm sewers on the west side of the project site are also collecting and re-routing an existing 12” RCP so it may continue to drain to the existing 30” RCP and remain separate from the proposed underground detention system. See Proposed Runoff Rates summary in Table 3 below and Developed Conditions Exhibit B.3 in Appendix B. Table 3: Proposed Runoff Rates Area (acres) 2-yr Runoff (cfs) 10-yr Runoff (cfs) 100-yr Runoff (cfs) Project Area 1.36 3.08 4.13 6.36 The runoff for the project area has been reduced so that the 10-yr. post developed condition does not exceed the 2-yr. pre and the 100-yr. post does not exceed the 10-yr. pre developed condition. IV. Storm Sewer Design The proposed storm sewer is designed to convey the 10-yr stormwater runoff flows from the proposed Inlet basins, based on 5 minute time of concentration (Tc). The storm sewer has been designed via the rational method in accordance with the City of Carmel Storm water Technical Standards Manual. The Proposed Storm Sewer Exhibits, calculations, and pipe sizes are provided in Exhibit C.3 in Appendix C. Corresponding Inlet basin areas are shown on the Inlet Basin Area Map Exhibit C.2 in Appendix C. V. Storm Water Detention The underground detention system is designed for 1.36 acres of runoff. The detention system will reduce runoff so that the 10-yr. post-developed condition does not exceed the 2-yr. pre and the 100-yr. post does not exceed the 10-yr. pre-developed condition. Refer to HydroCAD Model Exhibit D.2 in Appendix D, also see summary in Table 4 below. Page 4 of 71 TLF, Inc. Project No. 2023-119 The underground detention system was designed using a 11” diameter orifice in the HydroCAD model to not exceed the allowable release rates. Refer to Outlet Control Structure Detail Exhibit D.3 in Appendix D. VI. Storm Water Quality The proposed site improvements will utilize a manufactured water quality device (Aqua- Swirl Xcelerator XC-6) to meet the water quality requirements of the 1-inch 24-hour event and the 10-yr on-line flow rate. See Exhibit E.1 in Appendix E for the stormwater quality calculations, also see summary in Table 5 below. See Exhibit E.2 for Water Quality Unit Selection Table and Exhibit E.3 Water Quality BMP Detail in Appendix E. VII. Summary and Conclusions The decrease in storm water runoff for this project will be 3.07 cfs for the 10-yr. and 6.15 cfs for the 100-yr. storm events due to the proposed underground detention system. No adverse impacts are anticipated to affect adjacent or downstream landowners. Erosion control measures will be implemented before construction begins and maintained during construction. Table 4: Detention System Stage Release Summary Storm Event Elevation Release Rate (cfs) Allowable Release Rate (cfs) 10 year 842.40 4.13 4.76 100 year 844.72 6.36 7.20 Table 5: Stormwater Quality Summary Structure Number Aqua-Swirl Model Treatment Required (cfs) Treatment Provided (cfs) Max 10-yr. On-Line Flow Rate Provided (cfs) ST-207 XC-6 1.84 3.88 7.90 Page 5 of 71 TLF, Inc. Project No. 2023-119 Appendix A Maps Page 6 of 71 E. Main StreetKeystone PkwyPROJECT SITESITE LOCATION MAPEXHIBIT A.1Page 7 of 71 SOIL MAP AND DATA EXHIBIT A.2 Page 8 of 71 FLOOD INSURANCE RATE MAP EXHIBIT A.3 Page 9 of 71 TLF, Inc. Project No. 2023-119 Appendix B Site Drainage Conditions Page 10 of 71 EXISTING DRAINAGEBASIN = 1.59 ACRESEXISTING 30" RCP.206002040B.1EXISTING DRAINAGE CONDITIONSCOPYRIGHT 2023 BY FANNING/HOWEY ASSOCIATES, INC.WWW.FHAI.COMARCHITECTPROJECT NUMBER: 221165.01CARMEL HIGHSCHOOLPOLYTECHNICADDITION ANDRENOVATIONCARMEL CLAY SCHOOLS520 E MAIN STREETCARMEL, IN 46032PROJECT ISSUE DATE: 08/31/2023DRAWN BY: ARS317-848-0966350 E NEW YORK ST# 300, INDIANAPOLIS, IN 46204REV.NO.DESCRIPTIONDATECONSULTANT100% CONSTRUCTION DOCUMENTSKEY PLANUNIT ANEW ADDITIONPLAN NORTH TLF-ENGINEERS.COM317-334-15003901 WEST 86TH STREET, ST# 200, INDIANAPOLIS, IN 46268Page 11 of 71 EX 1.59 ACRES Routing Diagram for 2023-119_Underground Detention_2023-09-13 Prepared by TLF, Inc, Printed 9/14/2023 HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link Page 12 of 71 Type II 24-hr 100YR-24.0HR Rainfall=6.48"2023-119_Underground Detention_2023-09-13 Printed 9/14/2023Prepared by TLF, Inc HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Events for Subcatchment EX: 1.59 ACRES Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 002YR-0.083HR 0.39 0.27 0.013 0.10 002YR-0.167HR 0.66 0.82 0.038 0.28 002YR-0.5HR 1.23 2.15 0.102 0.77 002YR-01.0HR 1.54 2.90 0.139 1.05 002YR-02.0HR 1.66 3.19 0.154 1.16 002YR-03.0HR 1.77 3.46 0.168 1.26 002YR-06.0HR 2.10 4.26 0.209 1.58 002YR-12.0HR 2.40 4.98 0.247 1.87 002YR-24.0HR 2.64 5.56 0.278 2.10 010YR-0.083HR 0.51 0.50 0.023 0.18 010YR-0.167HR 0.87 1.29 0.060 0.45 010YR-0.5HR 1.63 3.12 0.150 1.13 010YR-01.0HR 2.03 4.09 0.200 1.51 010YR-02.0HR 2.22 4.55 0.224 1.69 010YR-03.0HR 2.52 5.27 0.263 1.98 010YR-06.0HR 3.00 6.42 0.325 2.45 010YR-12.0HR 3.48 7.57 0.387 2.92 010YR-24.0HR 3.84 8.42 0.434 3.27 100YR-0.083HR 0.76 1.04 0.048 0.36 100YR-0.167HR 1.30 2.32 0.110 0.83 100YR-0.5HR 2.42 5.03 0.250 1.89 100YR-01.0HR 3.03 6.50 0.328 2.48 100YR-02.0HR 3.74 8.19 0.421 3.17 100YR-03.0HR 4.26 9.42 0.489 3.69 100YR-06.0HR 5.10 11.39 0.599 4.52 100YR-12.0HR 5.76 12.94 0.685 5.17 100YR-24.0HR 6.48 14.62 0.780 5.89 Page 13 of 71 2023-119_Underground Detention_2023-09-13 Printed 9/14/2023Prepared by TLF, Inc Page 2HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 002YR-24.0HR Type II 24-hr Default 24.00 1 2.64 2 2 010YR-24.0HR Type II 24-hr Default 24.00 1 3.84 2 3 100YR-24.0HR Type II 24-hr Default 24.00 1 6.48 2 Page 14 of 71 2023-119_Underground Detention_2023-09-13 Printed 9/14/2023Prepared by TLF, Inc Page 3HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 0.300 84 50-75% Grass cover, Fair, HSG D (EX) 1.290 98 Paved parking, HSG D (EX) 1.590 95 TOTAL AREA Page 15 of 71 Type II 24-hr 002YR-24.0HR Rainfall=2.64"2023-119_Underground Detention_2023-09-13 Printed 9/14/2023Prepared by TLF, Inc Page 4HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment EX: 1.59 ACRES [49] Hint: Tc<2dt may require smaller dt Runoff = 5.56 cfs @ 11.95 hrs, Volume= 0.278 af, Depth= 2.10" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.50-48.00 hrs, dt= 0.05 hrs Type II 24-hr 002YR-24.0HR Rainfall=2.64" Area (ac) CN Description 0.300 84 50-75% Grass cover, Fair, HSG D 1.290 98 Paved parking, HSG D 1.590 95 Weighted Average 0.300 18.87% Pervious Area 1.290 81.13% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment EX: 1.59 ACRES Runoff Hydrograph Time (hours) 48464442403836343230282624222018161412108642Flow (cfs)6 5 4 3 2 1 0 Type II 24-hr 002YR-24.0HR Rainfall=2.64" Runoff Area=1.590 ac Runoff Volume=0.278 af Runoff Depth=2.10" Tc=5.0 min CN=95 5.56 cfs Page 16 of 71 Type II 24-hr 002YR-24.0HR Rainfall=2.64"2023-119_Underground Detention_2023-09-13 Printed 9/14/2023Prepared by TLF, Inc Page 5HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment EX: 1.59 ACRES Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.50 0.01 0.00 0.00 1.00 0.03 0.00 0.00 1.50 0.04 0.00 0.00 2.00 0.06 0.00 0.00 2.50 0.07 0.00 0.00 3.00 0.09 0.00 0.00 3.50 0.11 0.00 0.00 4.00 0.13 0.00 0.00 4.50 0.15 0.00 0.01 5.00 0.17 0.01 0.01 5.50 0.19 0.01 0.02 6.00 0.21 0.02 0.02 6.50 0.24 0.03 0.03 7.00 0.26 0.04 0.03 7.50 0.29 0.05 0.04 8.00 0.32 0.06 0.04 8.50 0.35 0.08 0.06 9.00 0.39 0.10 0.08 9.50 0.43 0.12 0.08 10.00 0.48 0.15 0.11 10.50 0.54 0.20 0.15 11.00 0.62 0.25 0.22 11.50 0.75 0.35 0.38 12.00 1.75 1.25 4.69 12.50 1.94 1.43 0.42 13.00 2.04 1.52 0.26 13.50 2.11 1.59 0.20 14.00 2.16 1.64 0.16 14.50 2.21 1.68 0.14 15.00 2.25 1.73 0.12 15.50 2.29 1.76 0.11 16.00 2.32 1.79 0.10 16.50 2.35 1.82 0.09 17.00 2.38 1.85 0.08 17.50 2.41 1.87 0.08 18.00 2.43 1.90 0.07 18.50 2.45 1.92 0.07 19.00 2.48 1.94 0.06 19.50 2.50 1.96 0.06 20.00 2.51 1.98 0.05 20.50 2.53 1.99 0.05 21.00 2.55 2.01 0.05 21.50 2.56 2.02 0.05 22.00 2.58 2.04 0.05 22.50 2.59 2.06 0.05 23.00 2.61 2.07 0.05 23.50 2.63 2.08 0.05 24.00 2.64 2.10 0.05 24.50 2.64 2.10 0.00 25.00 2.64 2.10 0.00 25.50 2.64 2.10 0.00 26.00 2.64 2.10 0.00 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 26.50 2.64 2.10 0.00 27.00 2.64 2.10 0.00 27.50 2.64 2.10 0.00 28.00 2.64 2.10 0.00 28.50 2.64 2.10 0.00 29.00 2.64 2.10 0.00 29.50 2.64 2.10 0.00 30.00 2.64 2.10 0.00 30.50 2.64 2.10 0.00 31.00 2.64 2.10 0.00 31.50 2.64 2.10 0.00 32.00 2.64 2.10 0.00 32.50 2.64 2.10 0.00 33.00 2.64 2.10 0.00 33.50 2.64 2.10 0.00 34.00 2.64 2.10 0.00 34.50 2.64 2.10 0.00 35.00 2.64 2.10 0.00 35.50 2.64 2.10 0.00 36.00 2.64 2.10 0.00 36.50 2.64 2.10 0.00 37.00 2.64 2.10 0.00 37.50 2.64 2.10 0.00 38.00 2.64 2.10 0.00 38.50 2.64 2.10 0.00 39.00 2.64 2.10 0.00 39.50 2.64 2.10 0.00 40.00 2.64 2.10 0.00 40.50 2.64 2.10 0.00 41.00 2.64 2.10 0.00 41.50 2.64 2.10 0.00 42.00 2.64 2.10 0.00 42.50 2.64 2.10 0.00 43.00 2.64 2.10 0.00 43.50 2.64 2.10 0.00 44.00 2.64 2.10 0.00 44.50 2.64 2.10 0.00 45.00 2.64 2.10 0.00 45.50 2.64 2.10 0.00 46.00 2.64 2.10 0.00 46.50 2.64 2.10 0.00 47.00 2.64 2.10 0.00 47.50 2.64 2.10 0.00 48.00 2.64 2.10 0.00 Page 17 of 71 Type II 24-hr 010YR-24.0HR Rainfall=3.84"2023-119_Underground Detention_2023-09-13 Printed 9/14/2023Prepared by TLF, Inc Page 6HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment EX: 1.59 ACRES [49] Hint: Tc<2dt may require smaller dt Runoff = 8.42 cfs @ 11.95 hrs, Volume= 0.434 af, Depth= 3.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.50-48.00 hrs, dt= 0.05 hrs Type II 24-hr 010YR-24.0HR Rainfall=3.84" Area (ac) CN Description 0.300 84 50-75% Grass cover, Fair, HSG D 1.290 98 Paved parking, HSG D 1.590 95 Weighted Average 0.300 18.87% Pervious Area 1.290 81.13% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment EX: 1.59 ACRES Runoff Hydrograph Time (hours) 48464442403836343230282624222018161412108642Flow (cfs)9 8 7 6 5 4 3 2 1 0 Type II 24-hr 010YR-24.0HR Rainfall=3.84" Runoff Area=1.590 ac Runoff Volume=0.434 af Runoff Depth=3.27" Tc=5.0 min CN=95 8.42 cfs Page 18 of 71 Type II 24-hr 010YR-24.0HR Rainfall=3.84"2023-119_Underground Detention_2023-09-13 Printed 9/14/2023Prepared by TLF, Inc Page 7HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment EX: 1.59 ACRES Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.06 0.00 0.00 2.00 0.08 0.00 0.00 2.50 0.11 0.00 0.00 3.00 0.13 0.00 0.01 3.50 0.16 0.00 0.01 4.00 0.18 0.01 0.02 4.50 0.21 0.02 0.03 5.00 0.24 0.03 0.04 5.50 0.27 0.04 0.04 6.00 0.31 0.06 0.05 6.50 0.34 0.07 0.06 7.00 0.38 0.09 0.07 7.50 0.42 0.12 0.08 8.00 0.46 0.14 0.09 8.50 0.51 0.17 0.11 9.00 0.56 0.21 0.14 9.50 0.63 0.26 0.15 10.00 0.70 0.31 0.18 10.50 0.78 0.38 0.25 11.00 0.90 0.48 0.35 11.50 1.09 0.64 0.60 12.00 2.55 2.01 7.06 12.50 2.82 2.28 0.63 13.00 2.96 2.41 0.39 13.50 3.07 2.52 0.30 14.00 3.15 2.59 0.23 14.50 3.22 2.66 0.21 15.00 3.28 2.72 0.18 15.50 3.33 2.77 0.16 16.00 3.38 2.82 0.14 16.50 3.42 2.86 0.13 17.00 3.46 2.90 0.13 17.50 3.50 2.94 0.12 18.00 3.54 2.98 0.11 18.50 3.57 3.01 0.10 19.00 3.60 3.04 0.09 19.50 3.63 3.07 0.09 20.00 3.66 3.09 0.08 20.50 3.68 3.12 0.08 21.00 3.70 3.14 0.08 21.50 3.73 3.16 0.07 22.00 3.75 3.19 0.07 22.50 3.77 3.21 0.07 23.00 3.80 3.23 0.07 23.50 3.82 3.25 0.07 24.00 3.84 3.27 0.07 24.50 3.84 3.27 0.00 25.00 3.84 3.27 0.00 25.50 3.84 3.27 0.00 26.00 3.84 3.27 0.00 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 26.50 3.84 3.27 0.00 27.00 3.84 3.27 0.00 27.50 3.84 3.27 0.00 28.00 3.84 3.27 0.00 28.50 3.84 3.27 0.00 29.00 3.84 3.27 0.00 29.50 3.84 3.27 0.00 30.00 3.84 3.27 0.00 30.50 3.84 3.27 0.00 31.00 3.84 3.27 0.00 31.50 3.84 3.27 0.00 32.00 3.84 3.27 0.00 32.50 3.84 3.27 0.00 33.00 3.84 3.27 0.00 33.50 3.84 3.27 0.00 34.00 3.84 3.27 0.00 34.50 3.84 3.27 0.00 35.00 3.84 3.27 0.00 35.50 3.84 3.27 0.00 36.00 3.84 3.27 0.00 36.50 3.84 3.27 0.00 37.00 3.84 3.27 0.00 37.50 3.84 3.27 0.00 38.00 3.84 3.27 0.00 38.50 3.84 3.27 0.00 39.00 3.84 3.27 0.00 39.50 3.84 3.27 0.00 40.00 3.84 3.27 0.00 40.50 3.84 3.27 0.00 41.00 3.84 3.27 0.00 41.50 3.84 3.27 0.00 42.00 3.84 3.27 0.00 42.50 3.84 3.27 0.00 43.00 3.84 3.27 0.00 43.50 3.84 3.27 0.00 44.00 3.84 3.27 0.00 44.50 3.84 3.27 0.00 45.00 3.84 3.27 0.00 45.50 3.84 3.27 0.00 46.00 3.84 3.27 0.00 46.50 3.84 3.27 0.00 47.00 3.84 3.27 0.00 47.50 3.84 3.27 0.00 48.00 3.84 3.27 0.00 Page 19 of 71 Type II 24-hr 100YR-24.0HR Rainfall=6.48"2023-119_Underground Detention_2023-09-13 Printed 9/14/2023Prepared by TLF, Inc Page 8HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment EX: 1.59 ACRES [49] Hint: Tc<2dt may require smaller dt Runoff = 14.62 cfs @ 11.95 hrs, Volume= 0.780 af, Depth= 5.89" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.50-48.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR-24.0HR Rainfall=6.48" Area (ac) CN Description 0.300 84 50-75% Grass cover, Fair, HSG D 1.290 98 Paved parking, HSG D 1.590 95 Weighted Average 0.300 18.87% Pervious Area 1.290 81.13% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment EX: 1.59 ACRES Runoff Hydrograph Time (hours) 48464442403836343230282624222018161412108642Flow (cfs)16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 100YR-24.0HR Rainfall=6.48" Runoff Area=1.590 ac Runoff Volume=0.780 af Runoff Depth=5.89" Tc=5.0 min CN=95 14.62 cfs Page 20 of 71 Type II 24-hr 100YR-24.0HR Rainfall=6.48"2023-119_Underground Detention_2023-09-13 Printed 9/14/2023Prepared by TLF, Inc Page 9HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment EX: 1.59 ACRES Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.50 0.03 0.00 0.00 1.00 0.07 0.00 0.00 1.50 0.10 0.00 0.00 2.00 0.14 0.00 0.01 2.50 0.18 0.01 0.03 3.00 0.22 0.02 0.04 3.50 0.27 0.04 0.06 4.00 0.31 0.06 0.07 4.50 0.36 0.08 0.08 5.00 0.41 0.11 0.10 5.50 0.46 0.14 0.11 6.00 0.52 0.18 0.13 6.50 0.58 0.22 0.14 7.00 0.64 0.27 0.15 7.50 0.71 0.32 0.17 8.00 0.78 0.38 0.18 8.50 0.86 0.44 0.23 9.00 0.95 0.52 0.28 9.50 1.06 0.61 0.29 10.00 1.17 0.72 0.36 10.50 1.32 0.85 0.47 11.00 1.52 1.03 0.66 11.50 1.83 1.33 1.10 12.00 4.30 3.72 12.21 12.50 4.76 4.18 1.08 13.00 5.00 4.42 0.67 13.50 5.18 4.60 0.51 14.00 5.31 4.73 0.40 14.50 5.43 4.84 0.35 15.00 5.53 4.95 0.31 15.50 5.62 5.04 0.28 16.00 5.70 5.12 0.24 16.50 5.77 5.19 0.23 17.00 5.84 5.26 0.21 17.50 5.91 5.32 0.20 18.00 5.97 5.38 0.19 18.50 6.02 5.44 0.17 19.00 6.08 5.49 0.16 19.50 6.12 5.54 0.15 20.00 6.17 5.58 0.14 20.50 6.21 5.62 0.13 21.00 6.25 5.66 0.13 21.50 6.29 5.70 0.13 22.00 6.33 5.74 0.12 22.50 6.37 5.78 0.12 23.00 6.41 5.82 0.12 23.50 6.44 5.85 0.12 24.00 6.48 5.89 0.11 24.50 6.48 5.89 0.00 25.00 6.48 5.89 0.00 25.50 6.48 5.89 0.00 26.00 6.48 5.89 0.00 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 26.50 6.48 5.89 0.00 27.00 6.48 5.89 0.00 27.50 6.48 5.89 0.00 28.00 6.48 5.89 0.00 28.50 6.48 5.89 0.00 29.00 6.48 5.89 0.00 29.50 6.48 5.89 0.00 30.00 6.48 5.89 0.00 30.50 6.48 5.89 0.00 31.00 6.48 5.89 0.00 31.50 6.48 5.89 0.00 32.00 6.48 5.89 0.00 32.50 6.48 5.89 0.00 33.00 6.48 5.89 0.00 33.50 6.48 5.89 0.00 34.00 6.48 5.89 0.00 34.50 6.48 5.89 0.00 35.00 6.48 5.89 0.00 35.50 6.48 5.89 0.00 36.00 6.48 5.89 0.00 36.50 6.48 5.89 0.00 37.00 6.48 5.89 0.00 37.50 6.48 5.89 0.00 38.00 6.48 5.89 0.00 38.50 6.48 5.89 0.00 39.00 6.48 5.89 0.00 39.50 6.48 5.89 0.00 40.00 6.48 5.89 0.00 40.50 6.48 5.89 0.00 41.00 6.48 5.89 0.00 41.50 6.48 5.89 0.00 42.00 6.48 5.89 0.00 42.50 6.48 5.89 0.00 43.00 6.48 5.89 0.00 43.50 6.48 5.89 0.00 44.00 6.48 5.89 0.00 44.50 6.48 5.89 0.00 45.00 6.48 5.89 0.00 45.50 6.48 5.89 0.00 46.00 6.48 5.89 0.00 46.50 6.48 5.89 0.00 47.00 6.48 5.89 0.00 47.50 6.48 5.89 0.00 48.00 6.48 5.89 0.00 Page 21 of 71 DNUPUPCONSTRUCTIONTRADES LABC106ADVANCED MFG.INNOVATION LABC116COMPUTER ARTROOMC120TEACHERSWORKROOMC122CERAMICSCLASSROOM / LABC123DRAWINGCLASSROOM / LABC125DRAWINGCLASSROOM / LABC126DRAWINGCLASSROOM / LABC127JEWELRYCLASSROOM / LABC128PHOTOGRAPHYC129STORAGEC123ASTORAGE /MATERIALSC123BSTORAGEC117ASTORAGE /MATERIALSC117BDEPT. HEADOFFICEC122ASTORAGEC131AMEDIA DATAC131BCORRIDORC101FCORRIDORC131CULINARY ARTSC124ADVANCEDCONSTRUCTIONTRADES LABC106BAUTOMOTIVESERVICES LABC115BADVANCEDAUTOMOTIVESERVICES LABC115CORRIDORC131CLASSROOMC107ADVANCED MFG.ARTISAN LABC107ACAD LABC109CAD LABC110STORAGEC101ACLASSROOMC139TV CLASSROOMC141STUDIO AC143STUDIO BC141ASTUDIO BC142OFFICEC141BENGINEERINGC142ATV CONTROLC144PASSAGEC138ASTUDIOC138BSTUDIOC138CSTUDIOC138DSTUDIOC138ECULINARY ARTSC124CLOSETC124ADRY GOODSC124BWALK-INC124CVESTIBULEC101GELECTRICALC100BCAD LABC114STORAGEC115ASPRAY BOOTHC115CADVANCED MFG.CLEAN LABC116ASTORAGEC106AC107BCORRIDORC101JCORRIDORC101HMECHANICALC151-C152EQUIPMENT ROOMC144ANEW BUILDING ADDITION16,000 SFFFE = 852.88EXISTING 30" RCP.PROPOSED DRAINAGE TOUNDERGROUND DETENTION = 1.36 ACRESPROPOSED DRAINAGE TOEXISTING 30" RCP = 0.34 ACRESEXISTING ROOF AREA TOEXISTING 30" RCP = 0.512 ACRES.206002040B.3PROPOSED DRAINAGE CONDITIONSCOPYRIGHT 2023 BY FANNING/HOWEY ASSOCIATES, INC.WWW.FHAI.COMARCHITECTPROJECT NUMBER: 221165.01CARMEL HIGHSCHOOLPOLYTECHNICADDITION ANDRENOVATIONCARMEL CLAY SCHOOLS520 E MAIN STREETCARMEL, IN 46032PROJECT ISSUE DATE: 08/31/2023DRAWN BY: ARS317-848-0966350 E NEW YORK ST# 300, INDIANAPOLIS, IN 46204REV.NO.DESCRIPTIONDATECONSULTANT100% CONSTRUCTION DOCUMENTSKEY PLANUNIT ANEW ADDITIONPLAN NORTH TLF-ENGINEERS.COM317-334-15003901 WEST 86TH STREET, ST# 200, INDIANAPOLIS, IN 46268Page 22 of 71 TLF, Inc. Project No. 2023-119 Appendix C Proposed Storm Sewer Calculations Page 23 of 71 Description:CHS - Polytechnic Reviewing Entity:City of Carmel Job #:2023-119 Date:- Duration Duration (min)(hr)2-Year 5-Year 10-Year 25-Year 50-Year 100-Year 5 0.083 4.63 5.43 6.12 7.17 8.09 9.12 10 0.167 3.95 4.63 5.22 6.12 6.90 7.78 30 0.5 2.46 2.88 3.25 3.81 4.29 4.84 60 1 1.54 1.80 2.03 2.38 2.68 3.03 120 2 0.83 0.95 1.11 1.37 1.60 1.87 180 3 0.59 0.72 0.84 1.04 1.22 1.42 360 6 0.35 0.43 0.50 0.62 0.72 0.85 720 12 0.20 0.24 0.29 0.35 0.41 0.48 1440 24 0.11 0.14 0.16 0.20 0.23 0.27 Duration Duration (min)(hr)2-Year 5-Year 10-Year 25-Year 50-Year 100-Year 5 0.083 0.39 0.45 0.51 0.60 0.67 0.76 10 0.167 0.66 0.77 0.87 1.02 1.15 1.30 30 0.5 1.23 1.44 1.63 1.91 2.15 2.42 60 1 1.54 1.80 2.03 2.38 2.68 3.03 120 2 1.66 1.90 2.22 2.74 3.20 3.74 180 3 1.77 2.16 2.52 3.12 3.66 4.26 360 6 2.10 2.58 3.00 3.72 4.32 5.10 720 12 2.40 2.88 3.48 4.20 4.92 5.76 1440 24 2.64 3.36 3.84 4.80 5.52 6.48 City of Carmel Data Job Information RAINFALL INTENSITIES & DEPTHS Frequency Rainfall Depth (in) Frequency Rainfall Intensity (in/hr) Page 24 of 71 DNUPUPCONSTRUCTIONTRADES LABC106ADVANCED MFG.INNOVATION LABC116COMPUTER ARTROOMC120TEACHERSWORKROOMC122CERAMICSCLASSROOM / LABC123DRAWINGCLASSROOM / LABC125DRAWINGCLASSROOM / LABC126DRAWINGCLASSROOM / LABC127JEWELRYCLASSROOM / LABC128PHOTOGRAPHYC129STORAGEC123ASTORAGE /MATERIALSC123BSTORAGEC117ASTORAGE /MATERIALSC117BDEPT. HEADOFFICEC122ASTORAGEC131AMEDIA DATAC131BCORRIDORC101FCORRIDORC131CULINARY ARTSC124ADVANCEDCONSTRUCTIONTRADES LABC106BAUTOMOTIVESERVICES LABC115BADVANCEDAUTOMOTIVESERVICES LABC115CORRIDORC131CLASSROOMC107ADVANCED MFG.ARTISAN LABC107ACAD LABC109CAD LABC110STORAGEC101ACLASSROOMC139TV CLASSROOMC141STUDIO AC143STUDIO BC141ASTUDIO BC142OFFICEC141BENGINEERINGC142ATV CONTROLC144PASSAGEC138ASTUDIOC138BSTUDIOC138CSTUDIOC138DSTUDIOC138ECULINARY ARTSC124CLOSETC124ADRY GOODSC124BWALK-INC124CVESTIBULEC101GELECTRICALC100BCAD LABC114STORAGEC115ASPRAY BOOTHC115CADVANCED MFG.CLEAN LABC116ASTORAGEC106AC107BCORRIDORC101JCORRIDORC101HMECHANICALC151-C152EQUIPMENT ROOMC144ANEW BUILDING ADDITION16,000 SFFFE = 852.88STR. NO. 1010.02 ACRESSTR. NO. 1020.21 ACRESSTR. NO. 2010.11 ACRESSTR. NO. 2020.15 ACRESSTR. NO. 2030.52 ACRESSTR. NO. 2050.21 ACRESROOF AREA TO STR.NO. 101 = 0.512 ACRESROOF AREA TO STR.NO. 201 = 0.112 ACRESROOF AREA TO STR.NO. 202 = 0.122 ACRESROOF AREA TO STR.NO. 204 = 0.120 ACRESDOCK AREA TO STR.NO. 101 = 0.12 ACRES.....206002040C.2PROPOSED INLET AREASCOPYRIGHT 2023 BY FANNING/HOWEY ASSOCIATES, INC.WWW.FHAI.COMARCHITECTPROJECT NUMBER: 221165.01CARMEL HIGHSCHOOLPOLYTECHNICADDITION ANDRENOVATIONCARMEL CLAY SCHOOLS520 E MAIN STREETCARMEL, IN 46032PROJECT ISSUE DATE: 08/31/2023DRAWN BY: ARS317-848-0966350 E NEW YORK ST# 300, INDIANAPOLIS, IN 46204REV.NO.DESCRIPTIONDATECONSULTANT100% CONSTRUCTION DOCUMENTSKEY PLANUNIT ANEW ADDITIONPLAN NORTH TLF-ENGINEERS.COM317-334-15003901 WEST 86TH STREET, ST# 200, INDIANAPOLIS, IN 46268Page 25 of 71 Description:CHS - PolytechnicReviewing Entity:Job #:Date:10-yrEntity DataInvert Drop0.1INLET CASTING TO INLETCASTING INLETc AREA c AREA INLET CASTING CUM. cA Tc Tcum CASTING INLET CASTING INLET Q CUM. QU.S. D.S. U.S. D.S. U.S. D.S(ft)(acres)(acres)(min)(min)(CFS)(CFS)(inches)(%)(cfs)(%)(ft/sec)(ft)(ft/sec)(min)(ft)(ft)(ft)(ft)(ft)(ft)101 10358.35RCP 0.85 0.02 0.90 1.331.21 0.02 1.215.005.00 - - 6.12 6.12 0.10 7.4318 0.600.013 8.14 91% 4.60 1.13 5.22 0.21852.00851.98 846.08 845.73 4.21 4.54102 10333.06RCP 0.85 0.21 - -0.18 0.18 0.185.005.00 - - 6.12 6.12 1.09 1.0912 0.320.013 2.02 54% 2.57 0.52 2.62 0.21851.30851.98 847.54847.432.60 3.38103 10467.03RCP - - - -- - 1.39-5.21 - - - 6.08 - 8.4718 0.700.013 8.79 96% 4.97 1.18 5.66 0.22851.98852.19 845.63 845.16 4.64 5.32104 10518.75RCP - - - -- - 1.39-5.44 - - - 6.04 - 8.4118 0.700.013 8.79 96% 4.97 1.18 5.66 0.06852.19 851.87845.06844.935.42 5.23201 202104.33RCP 0.85 0.11 0.90 0.110.19 0.09 0.195.005.00 - - 6.12 6.12 0.57 1.1812 0.320.013 2.02 58% 2.57 0.55 2.67 0.68851.54850.58 847.03846.703.34 2.71202 20474.51RCP 0.85 0.15 0.90 0.120.24 0.13 0.435.005.68 - - 6.12 6.00 0.78 2.5715 0.320.013 3.65 70% 2.98 0.77 3.22 0.42850.58849.96 846.20845.962.94 2.56203 20426.16RCP 0.85 0.52 - -0.44 0.44 0.445.005.00 - - 6.12 6.12 2.71 2.7112 0.750.013 3.09 88% 3.93 0.73 4.43 0.11849.65849.96 845.96 845.76 2.53 3.03204 20616.39RCP - - 0.90 0.120.11 - 0.985.006.09 - - 6.12 5.92 - 5.7918 0.400.013 6.64 87% 3.76 1.08 4.24 0.07849.96850.35 845.66845.602.59 3.05205 20642.48RCP 0.85 0.21 - -0.18 0.18 0.185.005.00 - - 6.12 6.12 1.09 1.0912 0.320.013 2.02 54% 2.57 0.52 2.62 0.28851.18850.35 846.73846.603.28 2.59206 2079.38RCP - - - -- - 1.16-6.17 - - - 5.91 - 6.8318 0.550.013 7.79 88% 4.41 1.09 4.97 0.04850.35850.57 841.10841.047.55 7.82207 DETENTION8.00RCP - - - -- - 1.16-6.20 - - - 5.90 - 6.8318 0.550.013 7.79 88% 4.41 1.09 4.97 0.03850.57 849.65841.04841.007.82 6.94TRAVEL TIMEDIRECT TO INLETiFLOW DEPTHFLOW VELOCITYCAPACITY UTILIZATIONMANNING'S NSTR.PROPOSED STORM SEWER SYSTEM STORM SEWER DESIGN TABLE - RATIONAL METHODJob InformationCity of Carmel2023-119COVERLENGTHDrop Amount:INVERTRIMENTITY DATAiPIPE DIAMETERPIPE SLOPE FULL PIPE CAPACITYELEV.ELEV.FULL FLOW VELOCITY08/17/23(in/hr)CHEN'S METHODDesign Storm:TO STR.DIRECT TO CASTINGPIPE MATERIALDesign ParametersIntensity Calculation Method:cAInvert Calculation Method:FLOW(in/hr)Page 26 of 71 Description:CHS - PolytechnicReviewing Entity:City of CarmelJob #:2023-119Date:-STR. STRUCTURE CASTINGGRADE CONNECT TO REMARKSNO.TYPETYPEL.F.SIZETYPET.O.R.UPSTMDNSTM(%)STRUCT.101EXISTING EXISTING58 18 RCP 852.00 846.08 845.73 0.60 103 102 TYPE ''A'' INLET R-3472 33 12 RCP 851.30 847.54 847.43 0.32 103 103 TYPE ''C'' MANHOLE R-1772 67 18 RCP 851.98 845.63 845.16 0.70 104 104 TYPE ''C'' MANHOLE R-1772 19 18 RCP 852.19 845.06 844.93 0.70 105 201 TYPE ''A'' INLET R-3286-8V 104 12 RCP 851.54 847.03 846.70 0.32 202 202 TYPE ''M'' INLET R-3287-10V 75 15 RCP 850.58 846.20 845.96 0.32 204 203 TYPE ''M'' INLET R-3287-SB10 26 12 RCP 849.65 845.96 845.76 0.75 204 204 TYPE ''C'' MANHOLE R-1772 16 18 RCP 849.96 845.66 845.60 0.40 206 205 TYPE ''A'' INLET R-3286-8V 42 12 RCP 851.18 846.73 846.60 0.32 206 206 TYPE ''C'' MANHOLE R-1772 9 18 RCP 850.35 841.10 841.04 0.55 207 207AQUA-SWIRL XC-6 PER MAN.8 18 RCP 850.57 841.04 841.00 0.55 DETENTION *ALL CASTINGS SHALL READ "DUMP NO WASTE DRAINS TO WATERWAY"PROPOSED STORM SEWER SYSTEM STORM SEWER STRUCTURE DATA TABLEPIPE ELEVATIONSPIPEJob InformationSTORM SEWER - STRUCTURE DATA TABLEPage 27 of 71 Job Information Description: Reviewing Entity:City of Carmel Job #:2023-119 Date:- 10-yr 50% Entity Data SPECIFIED SPECIFIED PIPE STRUCTURE CASTING CASTING CASTING ENTITY DATA CASTING ORIFICE FLOW WEIR FLOW PONDING DEPTH STR.STRUCTURE CASTING COVER DEPTH c A Tc i FLOW DEPTH DEPTH NO.TYPE TYPE (ft)(ft)(acres)(min)(in/hr)(cfs)(ft)(ft)(ft) 101 EXISTING EXISTING 4.21 5.92 0.85 0.02 5.00 6.12 0.10 - - 0.00 102 TYPE ''A'' INLET R-3472 2.60 3.76 0.85 0.21 5.00 6.12 1.09 0.12 0.22 0.22 103 TYPE ''C'' MANHOLE R-1772 4.64 6.35 - - - - - - - 0.00 104 TYPE ''C'' MANHOLE R-1772 5.42 7.13 - - - - - - - 0.00 201 TYPE ''A'' INLET R-3286-8V 3.34 4.51 0.85 0.11 5.00 6.12 0.57 0.12 0.20 0.20 202 TYPE ''M'' INLET R-3287-10V 2.94 4.38 0.85 0.15 5.00 6.12 0.78 0.02 0.22 0.22 203 TYPE ''M'' INLET R-3287-SB10 2.53 3.69 0.85 0.52 5.00 6.12 2.71 0.56 0.47 0.56 204 TYPE ''C'' MANHOLE R-1772 2.59 4.30 - - - - - - - 0.00 205 TYPE ''A'' INLET R-3286-8V 3.28 4.45 0.85 0.21 5.00 6.12 1.09 0.42 0.31 0.42 206 TYPE ''C'' MANHOLE R-1772 7.55 9.25 - - - - - - - 0.00 207 AQUA-SWIRL XC-6 PER MAN. 7.82 9.53 - - - - - - - 0.00 Design Parameters Design Storm: PROPOSED STORM SEWER SYSTEM ORIFICE FLOW CASTING CAPACITY CALCULATIONS Clogging (%): CHS - Polytechnic Intensity Calculation Method: Page 28 of 71 Description:CHS - PolytechnicEntity:City of CarmelJob #:2023-119Date:-10-yr10-yrPond Discharge 4.39Entity Data(dc+D)/2Structure Coefficient(ft)(ft)(ft)(ft)(min)(in/hr)(cfs)(in.)%(sq. ft)(ft.)(ft.)(ft.)(ft)(ft/s)(ft)(ft)(ft/s)(ft.)(ft.)(ft.)(ft.)(ft/s)(ft)(ft)(ft)(ft.)(ft.)(ft.)103 101 845.73 847.23 847.01 847.37 5.00 6.12 7.43 18 0.60 1.423 3.145 0.453 1.126 1.056 5.22 58 0.013 0.348 - 0.10 0.10 0.10 0.10 - 1.25 5.66 - 0.529 0.877 848.25 852.00 847.58103 102 847.43 848.43 848.15 848.15 5.00 6.12 1.09 12 0.32 0.417 1.620 0.258 0.525 0.440 2.62 33 0.013 0.105 - 0.10 0.10 0.10 0.10 - 1.25 5.66 - 0.133 0.238 848.39 851.30 848.54104 103 845.16 846.66 846.47 846.87 5.21 6.08 8.47 18 0.70 1.495 3.279 0.456 1.183 1.127 5.66 67 0.013 0.467 5.22 0.10 0.10 0.10 0.10 - 0.50 5.66 - 0.038 0.504 847.37 851.98 847.13105 104 844.93 846.43 846.24 846.24 5.44 6.04 8.41 18 0.70 1.486 3.261 0.456 1.175 1.123 5.66 19 0.013 0.131 5.66 0.10 0.10 0.10 0.10 1.00 0.50 - 0.498 0.000 0.629 846.87 852.19 846.56202 201 846.70 847.70 847.43 847.43 5.00 6.12 1.18 12 0.32 0.442 1.670 0.265 0.549 0.457 2.67 104 0.013 0.332 - 0.10 0.10 0.10 0.10 - 1.25 3.22 - 0.138 0.470 847.90 851.54 848.03204 202 845.96 847.21 846.91 846.93 5.68 6.00 2.57 15 0.32 0.796 2.261 0.352 0.772 0.642 3.22 75 0.013 0.237 2.67 0.10 0.10 0.10 0.10 - 0.50 4.24 - 0.026 0.263 847.20 850.58 847.45204 203 845.76 846.76 846.61 846.93 5.00 6.12 2.71 12 0.75 0.611 2.040 0.299 0.726 0.705 4.43 26 0.013 0.195 - 0.10 0.10 0.10 0.10 - 1.25 4.24 - 0.381 0.576 847.51 849.65 846.96206 204 845.60 847.10 846.81 846.81 6.09 5.92 5.79 18 0.40 1.367 3.049 0.449 1.084 0.929 4.24 16 0.013 0.065 3.22 0.10 0.10 0.10 0.10 - 0.50 4.97 - 0.059 0.124 846.93 849.96 847.16206 205 846.60 847.60 847.32 847.32 5.00 6.12 1.09 12 0.32 0.417 1.620 0.258 0.525 0.440 2.62 42 0.013 0.135 - 0.10 0.10 0.10 0.10 - 1.25 4.97 - 0.133 0.268 847.58 851.18 847.73207 206 841.04 842.54 842.30 842.68 6.17 5.91 6.83 18 0.55 1.375 3.061 0.449 1.089 1.012 4.97 9 0.013 0.051 4.24 0.10 0.10 0.10 0.10 - 0.50 4.97 - 0.053 0.104 842.79 850.35 842.60DETENTION 207 841.00 842.50 842.26 842.26 6.20 5.90 6.83 18 0.55 1.374 3.059 0.449 1.088 1.011 4.97 8 0.013 0.044 4.97 0.10 0.10 0.10 0.10 1.00 0.50 - 0.384 0.000 0.428 842.68 850.57 842.54Intensity Calculation Method:Starting Elevation:Calculation Method:INTENSITYPROPOSED STORM SEWER SYSTEM HYDRAULIC GRADE LINE CALCULATIONSJob InformationDesign ParametersDesign Storm:D.S. STR. U.S. STR.D.S. INV. ELEV.D.S. CROWN ELEV.CRITICAL DEPTH(dc+D)/2 ELEV.STARTING ELEV. Tc ENTITY DATAUPSTREAM MAXIMUM INFLUENT VELOCITYFLOW DIAMETER SLOPE AREAWETTED PERIMETERHYDRAULIC RADIUSFLOW DEPTH VELOCITY LENGTH MANNING'S NFRICTION LOSS"A" LOSS "B" LOSS "C" LOSSTOTAL LOSSU.S. HGL ELEV.U.S. STR. CROWN"D" LOSSOUTLET STRUCTURE COEFFICIENTUPSTREAM STRUCTURE COEFFICIENTEFFLUENT PIPE VELOCITYOUTLET STRUCTURE LOSSUPSTREAM STRUCTURE LOSSU.S. STR. TORPage 29 of 71 TLF, Inc. Project No. 2023-119 Appendix D Proposed Detention Calculations Page 30 of 71 EX2 1.36 ACRES for Allowable Release Routing Diagram for 2023-119_Underground Detention_2023-09-13 Prepared by TLF, Inc, Printed 9/19/2023 HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link Page 31 of 71 Type II 24-hr 100YR-24.0HR Rainfall=6.48"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Events for Subcatchment EX2: 1.36 ACRES for Allowable Release Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 002YR-0.083HR 0.39 0.23 0.011 0.10 002YR-0.167HR 0.66 0.70 0.032 0.28 002YR-0.5HR 1.23 1.84 0.087 0.77 002YR-01.0HR 1.54 2.48 0.119 1.05 002YR-02.0HR 1.66 2.73 0.132 1.16 002YR-03.0HR 1.77 2.96 0.143 1.26 002YR-06.0HR 2.10 3.64 0.179 1.58 002YR-12.0HR 2.40 4.26 0.212 1.87 002YR-24.0HR 2.64 4.76 0.238 2.10 010YR-0.083HR 0.51 0.43 0.020 0.18 010YR-0.167HR 0.87 1.11 0.051 0.45 010YR-0.5HR 1.63 2.67 0.128 1.13 010YR-01.0HR 2.03 3.50 0.171 1.51 010YR-02.0HR 2.22 3.89 0.192 1.69 010YR-03.0HR 2.52 4.51 0.225 1.98 010YR-06.0HR 3.00 5.49 0.278 2.45 010YR-12.0HR 3.48 6.47 0.331 2.92 010YR-24.0HR 3.84 7.20 0.371 3.27 100YR-0.083HR 0.76 0.89 0.041 0.36 100YR-0.167HR 1.30 1.98 0.094 0.83 100YR-0.5HR 2.42 4.30 0.214 1.89 100YR-01.0HR 3.03 5.56 0.281 2.48 100YR-02.0HR 3.74 7.00 0.360 3.17 100YR-03.0HR 4.26 8.05 0.418 3.69 100YR-06.0HR 5.10 9.74 0.512 4.52 100YR-12.0HR 5.76 11.07 0.586 5.17 100YR-24.0HR 6.48 12.51 0.667 5.89 Page 32 of 71 2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 2HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 002YR-24.0HR Type II 24-hr Default 24.00 1 2.64 2 2 010YR-24.0HR Type II 24-hr Default 24.00 1 3.84 2 3 100YR-24.0HR Type II 24-hr Default 24.00 1 6.48 2 Page 33 of 71 2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 3HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 0.300 84 50-75% Grass cover, Fair, HSG D (EX2) 1.060 98 Paved parking, HSG D (EX2) 1.360 95 TOTAL AREA Page 34 of 71 Type II 24-hr 002YR-24.0HR Rainfall=2.64"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 4HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment EX2: 1.36 ACRES for Allowable Release [49] Hint: Tc<2dt may require smaller dt Runoff = 4.76 cfs @ 11.95 hrs, Volume= 0.238 af, Depth= 2.10" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.50-48.00 hrs, dt= 0.05 hrs Type II 24-hr 002YR-24.0HR Rainfall=2.64" Area (ac) CN Description 0.300 84 50-75% Grass cover, Fair, HSG D 1.060 98 Paved parking, HSG D 1.360 95 Weighted Average 0.300 22.06% Pervious Area 1.060 77.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment EX2: 1.36 ACRES for Allowable Release Runoff Hydrograph Time (hours) 48464442403836343230282624222018161412108642Flow (cfs)5 4 3 2 1 0 Type II 24-hr 002YR-24.0HR Rainfall=2.64" Runoff Area=1.360 ac Runoff Volume=0.238 af Runoff Depth=2.10" Tc=5.0 min CN=95 4.76 cfs Page 35 of 71 Type II 24-hr 002YR-24.0HR Rainfall=2.64"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 5HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment EX2: 1.36 ACRES for Allowable Release Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.50 0.01 0.00 0.00 1.00 0.03 0.00 0.00 1.50 0.04 0.00 0.00 2.00 0.06 0.00 0.00 2.50 0.07 0.00 0.00 3.00 0.09 0.00 0.00 3.50 0.11 0.00 0.00 4.00 0.13 0.00 0.00 4.50 0.15 0.00 0.01 5.00 0.17 0.01 0.01 5.50 0.19 0.01 0.01 6.00 0.21 0.02 0.02 6.50 0.24 0.03 0.02 7.00 0.26 0.04 0.03 7.50 0.29 0.05 0.03 8.00 0.32 0.06 0.04 8.50 0.35 0.08 0.05 9.00 0.39 0.10 0.06 9.50 0.43 0.12 0.07 10.00 0.48 0.15 0.09 10.50 0.54 0.20 0.13 11.00 0.62 0.25 0.18 11.50 0.75 0.35 0.32 12.00 1.75 1.25 4.01 12.50 1.94 1.43 0.36 13.00 2.04 1.52 0.22 13.50 2.11 1.59 0.17 14.00 2.16 1.64 0.13 14.50 2.21 1.68 0.12 15.00 2.25 1.73 0.11 15.50 2.29 1.76 0.09 16.00 2.32 1.79 0.08 16.50 2.35 1.82 0.08 17.00 2.38 1.85 0.07 17.50 2.41 1.87 0.07 18.00 2.43 1.90 0.06 18.50 2.45 1.92 0.06 19.00 2.48 1.94 0.05 19.50 2.50 1.96 0.05 20.00 2.51 1.98 0.05 20.50 2.53 1.99 0.04 21.00 2.55 2.01 0.04 21.50 2.56 2.02 0.04 22.00 2.58 2.04 0.04 22.50 2.59 2.06 0.04 23.00 2.61 2.07 0.04 23.50 2.63 2.08 0.04 24.00 2.64 2.10 0.04 24.50 2.64 2.10 0.00 25.00 2.64 2.10 0.00 25.50 2.64 2.10 0.00 26.00 2.64 2.10 0.00 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 26.50 2.64 2.10 0.00 27.00 2.64 2.10 0.00 27.50 2.64 2.10 0.00 28.00 2.64 2.10 0.00 28.50 2.64 2.10 0.00 29.00 2.64 2.10 0.00 29.50 2.64 2.10 0.00 30.00 2.64 2.10 0.00 30.50 2.64 2.10 0.00 31.00 2.64 2.10 0.00 31.50 2.64 2.10 0.00 32.00 2.64 2.10 0.00 32.50 2.64 2.10 0.00 33.00 2.64 2.10 0.00 33.50 2.64 2.10 0.00 34.00 2.64 2.10 0.00 34.50 2.64 2.10 0.00 35.00 2.64 2.10 0.00 35.50 2.64 2.10 0.00 36.00 2.64 2.10 0.00 36.50 2.64 2.10 0.00 37.00 2.64 2.10 0.00 37.50 2.64 2.10 0.00 38.00 2.64 2.10 0.00 38.50 2.64 2.10 0.00 39.00 2.64 2.10 0.00 39.50 2.64 2.10 0.00 40.00 2.64 2.10 0.00 40.50 2.64 2.10 0.00 41.00 2.64 2.10 0.00 41.50 2.64 2.10 0.00 42.00 2.64 2.10 0.00 42.50 2.64 2.10 0.00 43.00 2.64 2.10 0.00 43.50 2.64 2.10 0.00 44.00 2.64 2.10 0.00 44.50 2.64 2.10 0.00 45.00 2.64 2.10 0.00 45.50 2.64 2.10 0.00 46.00 2.64 2.10 0.00 46.50 2.64 2.10 0.00 47.00 2.64 2.10 0.00 47.50 2.64 2.10 0.00 48.00 2.64 2.10 0.00 Page 36 of 71 Type II 24-hr 010YR-24.0HR Rainfall=3.84"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 6HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment EX2: 1.36 ACRES for Allowable Release [49] Hint: Tc<2dt may require smaller dt Runoff = 7.20 cfs @ 11.95 hrs, Volume= 0.371 af, Depth= 3.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.50-48.00 hrs, dt= 0.05 hrs Type II 24-hr 010YR-24.0HR Rainfall=3.84" Area (ac) CN Description 0.300 84 50-75% Grass cover, Fair, HSG D 1.060 98 Paved parking, HSG D 1.360 95 Weighted Average 0.300 22.06% Pervious Area 1.060 77.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment EX2: 1.36 ACRES for Allowable Release Runoff Hydrograph Time (hours) 48464442403836343230282624222018161412108642Flow (cfs)8 7 6 5 4 3 2 1 0 Type II 24-hr 010YR-24.0HR Rainfall=3.84" Runoff Area=1.360 ac Runoff Volume=0.371 af Runoff Depth=3.27" Tc=5.0 min CN=95 7.20 cfs Page 37 of 71 Type II 24-hr 010YR-24.0HR Rainfall=3.84"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 7HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment EX2: 1.36 ACRES for Allowable Release Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.06 0.00 0.00 2.00 0.08 0.00 0.00 2.50 0.11 0.00 0.00 3.00 0.13 0.00 0.01 3.50 0.16 0.00 0.01 4.00 0.18 0.01 0.02 4.50 0.21 0.02 0.02 5.00 0.24 0.03 0.03 5.50 0.27 0.04 0.04 6.00 0.31 0.06 0.04 6.50 0.34 0.07 0.05 7.00 0.38 0.09 0.06 7.50 0.42 0.12 0.07 8.00 0.46 0.14 0.07 8.50 0.51 0.17 0.09 9.00 0.56 0.21 0.12 9.50 0.63 0.26 0.13 10.00 0.70 0.31 0.16 10.50 0.78 0.38 0.21 11.00 0.90 0.48 0.30 11.50 1.09 0.64 0.52 12.00 2.55 2.01 6.04 12.50 2.82 2.28 0.54 13.00 2.96 2.41 0.33 13.50 3.07 2.52 0.25 14.00 3.15 2.59 0.20 14.50 3.22 2.66 0.18 15.00 3.28 2.72 0.16 15.50 3.33 2.77 0.14 16.00 3.38 2.82 0.12 16.50 3.42 2.86 0.11 17.00 3.46 2.90 0.11 17.50 3.50 2.94 0.10 18.00 3.54 2.98 0.09 18.50 3.57 3.01 0.09 19.00 3.60 3.04 0.08 19.50 3.63 3.07 0.07 20.00 3.66 3.09 0.07 20.50 3.68 3.12 0.07 21.00 3.70 3.14 0.06 21.50 3.73 3.16 0.06 22.00 3.75 3.19 0.06 22.50 3.77 3.21 0.06 23.00 3.80 3.23 0.06 23.50 3.82 3.25 0.06 24.00 3.84 3.27 0.06 24.50 3.84 3.27 0.00 25.00 3.84 3.27 0.00 25.50 3.84 3.27 0.00 26.00 3.84 3.27 0.00 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 26.50 3.84 3.27 0.00 27.00 3.84 3.27 0.00 27.50 3.84 3.27 0.00 28.00 3.84 3.27 0.00 28.50 3.84 3.27 0.00 29.00 3.84 3.27 0.00 29.50 3.84 3.27 0.00 30.00 3.84 3.27 0.00 30.50 3.84 3.27 0.00 31.00 3.84 3.27 0.00 31.50 3.84 3.27 0.00 32.00 3.84 3.27 0.00 32.50 3.84 3.27 0.00 33.00 3.84 3.27 0.00 33.50 3.84 3.27 0.00 34.00 3.84 3.27 0.00 34.50 3.84 3.27 0.00 35.00 3.84 3.27 0.00 35.50 3.84 3.27 0.00 36.00 3.84 3.27 0.00 36.50 3.84 3.27 0.00 37.00 3.84 3.27 0.00 37.50 3.84 3.27 0.00 38.00 3.84 3.27 0.00 38.50 3.84 3.27 0.00 39.00 3.84 3.27 0.00 39.50 3.84 3.27 0.00 40.00 3.84 3.27 0.00 40.50 3.84 3.27 0.00 41.00 3.84 3.27 0.00 41.50 3.84 3.27 0.00 42.00 3.84 3.27 0.00 42.50 3.84 3.27 0.00 43.00 3.84 3.27 0.00 43.50 3.84 3.27 0.00 44.00 3.84 3.27 0.00 44.50 3.84 3.27 0.00 45.00 3.84 3.27 0.00 45.50 3.84 3.27 0.00 46.00 3.84 3.27 0.00 46.50 3.84 3.27 0.00 47.00 3.84 3.27 0.00 47.50 3.84 3.27 0.00 48.00 3.84 3.27 0.00 Page 38 of 71 Type II 24-hr 100YR-24.0HR Rainfall=6.48"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 8HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment EX2: 1.36 ACRES for Allowable Release [49] Hint: Tc<2dt may require smaller dt Runoff = 12.51 cfs @ 11.95 hrs, Volume= 0.667 af, Depth= 5.89" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.50-48.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR-24.0HR Rainfall=6.48" Area (ac) CN Description 0.300 84 50-75% Grass cover, Fair, HSG D 1.060 98 Paved parking, HSG D 1.360 95 Weighted Average 0.300 22.06% Pervious Area 1.060 77.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment EX2: 1.36 ACRES for Allowable Release Runoff Hydrograph Time (hours) 48464442403836343230282624222018161412108642Flow (cfs)14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 100YR-24.0HR Rainfall=6.48" Runoff Area=1.360 ac Runoff Volume=0.667 af Runoff Depth=5.89" Tc=5.0 min CN=95 12.51 cfs Page 39 of 71 Type II 24-hr 100YR-24.0HR Rainfall=6.48"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 9HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment EX2: 1.36 ACRES for Allowable Release Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.50 0.03 0.00 0.00 1.00 0.07 0.00 0.00 1.50 0.10 0.00 0.00 2.00 0.14 0.00 0.01 2.50 0.18 0.01 0.02 3.00 0.22 0.02 0.04 3.50 0.27 0.04 0.05 4.00 0.31 0.06 0.06 4.50 0.36 0.08 0.07 5.00 0.41 0.11 0.08 5.50 0.46 0.14 0.10 6.00 0.52 0.18 0.11 6.50 0.58 0.22 0.12 7.00 0.64 0.27 0.13 7.50 0.71 0.32 0.14 8.00 0.78 0.38 0.16 8.50 0.86 0.44 0.19 9.00 0.95 0.52 0.24 9.50 1.06 0.61 0.25 10.00 1.17 0.72 0.31 10.50 1.32 0.85 0.40 11.00 1.52 1.03 0.57 11.50 1.83 1.33 0.94 12.00 4.30 3.72 10.44 12.50 4.76 4.18 0.92 13.00 5.00 4.42 0.57 13.50 5.18 4.60 0.43 14.00 5.31 4.73 0.34 14.50 5.43 4.84 0.30 15.00 5.53 4.95 0.27 15.50 5.62 5.04 0.24 16.00 5.70 5.12 0.21 16.50 5.77 5.19 0.19 17.00 5.84 5.26 0.18 17.50 5.91 5.32 0.17 18.00 5.97 5.38 0.16 18.50 6.02 5.44 0.15 19.00 6.08 5.49 0.14 19.50 6.12 5.54 0.13 20.00 6.17 5.58 0.12 20.50 6.21 5.62 0.11 21.00 6.25 5.66 0.11 21.50 6.29 5.70 0.11 22.00 6.33 5.74 0.11 22.50 6.37 5.78 0.10 23.00 6.41 5.82 0.10 23.50 6.44 5.85 0.10 24.00 6.48 5.89 0.10 24.50 6.48 5.89 0.00 25.00 6.48 5.89 0.00 25.50 6.48 5.89 0.00 26.00 6.48 5.89 0.00 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 26.50 6.48 5.89 0.00 27.00 6.48 5.89 0.00 27.50 6.48 5.89 0.00 28.00 6.48 5.89 0.00 28.50 6.48 5.89 0.00 29.00 6.48 5.89 0.00 29.50 6.48 5.89 0.00 30.00 6.48 5.89 0.00 30.50 6.48 5.89 0.00 31.00 6.48 5.89 0.00 31.50 6.48 5.89 0.00 32.00 6.48 5.89 0.00 32.50 6.48 5.89 0.00 33.00 6.48 5.89 0.00 33.50 6.48 5.89 0.00 34.00 6.48 5.89 0.00 34.50 6.48 5.89 0.00 35.00 6.48 5.89 0.00 35.50 6.48 5.89 0.00 36.00 6.48 5.89 0.00 36.50 6.48 5.89 0.00 37.00 6.48 5.89 0.00 37.50 6.48 5.89 0.00 38.00 6.48 5.89 0.00 38.50 6.48 5.89 0.00 39.00 6.48 5.89 0.00 39.50 6.48 5.89 0.00 40.00 6.48 5.89 0.00 40.50 6.48 5.89 0.00 41.00 6.48 5.89 0.00 41.50 6.48 5.89 0.00 42.00 6.48 5.89 0.00 42.50 6.48 5.89 0.00 43.00 6.48 5.89 0.00 43.50 6.48 5.89 0.00 44.00 6.48 5.89 0.00 44.50 6.48 5.89 0.00 45.00 6.48 5.89 0.00 45.50 6.48 5.89 0.00 46.00 6.48 5.89 0.00 46.50 6.48 5.89 0.00 47.00 6.48 5.89 0.00 47.50 6.48 5.89 0.00 48.00 6.48 5.89 0.00 Page 40 of 71 PRO 1.36 ACRES 1P Underground Chambers Routing Diagram for 2023-119_Underground Detention_2023-09-13 Prepared by TLF, Inc, Printed 9/19/2023 HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link Page 41 of 71 Type II 24-hr 100YR-24.0HR Rainfall=6.48"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Events for Pond 1P: Underground Chambers Event Inflow (cfs) Primary (cfs) Elevation (feet) Storage (acre-feet) 002YR-0.083HR 0.31 0.17 840.45 0.004 002YR-0.167HR 0.78 0.61 840.66 0.007 002YR-0.5HR 1.91 1.64 840.98 0.013 002YR-01.0HR 2.53 1.99 841.09 0.016 002YR-02.0HR 2.76 2.12 841.15 0.018 002YR-03.0HR 2.98 2.21 841.19 0.020 002YR-06.0HR 3.64 2.55 841.35 0.026 002YR-12.0HR 4.23 2.85 841.51 0.031 002YR-24.0HR 4.70 3.08 841.65 0.036 010YR-0.083HR 0.51 0.36 840.55 0.005 010YR-0.167HR 1.19 0.99 840.78 0.009 010YR-0.5HR 2.70 2.08 841.13 0.018 010YR-01.0HR 3.50 2.48 841.32 0.025 010YR-02.0HR 3.87 2.67 841.42 0.028 010YR-03.0HR 4.47 2.96 841.58 0.034 010YR-06.0HR 5.40 3.41 841.86 0.044 010YR-12.0HR 6.34 3.83 842.16 0.054 010YR-24.0HR 7.04 4.13 842.40 0.063 100YR-0.083HR 0.98 0.79 840.72 0.008 100YR-0.167HR 2.05 1.74 841.01 0.013 100YR-0.5HR 4.27 2.87 841.52 0.032 100YR-01.0HR 5.46 3.43 841.88 0.044 100YR-02.0HR 6.84 4.05 842.33 0.060 100YR-03.0HR 7.85 4.48 842.70 0.072 100YR-06.0HR 9.47 5.15 843.34 0.093 100YR-12.0HR 10.73 5.69 843.91 0.110 100YR-24.0HR 12.11 6.36 844.72 0.127 Page 42 of 71 2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 2HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 002YR-24.0HR Type II 24-hr Default 24.00 1 2.64 2 2 010YR-24.0HR Type II 24-hr Default 24.00 1 3.84 2 3 100YR-24.0HR Type II 24-hr Default 24.00 1 6.48 2 Page 43 of 71 2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 3HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 0.213 84 50-75% Grass cover, Fair, HSG D (PRO) 0.793 98 Paved parking, HSG D (PRO) 0.354 98 Roofs, HSG D (PRO) 1.360 96 TOTAL AREA Page 44 of 71 Type II 24-hr 002YR-24.0HR Rainfall=2.64"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 4HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PRO: 1.36 ACRES Runoff = 4.70 cfs @ 11.96 hrs, Volume= 0.249 af, Depth= 2.20" Routed to Pond 1P : Underground Chambers Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.50-48.00 hrs, dt= 0.05 hrs Type II 24-hr 002YR-24.0HR Rainfall=2.64" Area (ac) CN Description 0.213 84 50-75% Grass cover, Fair, HSG D 0.793 98 Paved parking, HSG D 0.354 98 Roofs, HSG D 1.360 96 Weighted Average 0.213 15.66% Pervious Area 1.147 84.34% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment PRO: 1.36 ACRES Runoff Hydrograph Time (hours) 48464442403836343230282624222018161412108642Flow (cfs)5 4 3 2 1 0 Type II 24-hr 002YR-24.0HR Rainfall=2.64" Runoff Area=1.360 ac Runoff Volume=0.249 af Runoff Depth=2.20" Tc=6.0 min CN=96 4.70 cfs Page 45 of 71 Type II 24-hr 002YR-24.0HR Rainfall=2.64"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 5HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment PRO: 1.36 ACRES Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.50 0.01 0.00 0.00 1.00 0.03 0.00 0.00 1.50 0.04 0.00 0.00 2.00 0.06 0.00 0.00 2.50 0.07 0.00 0.00 3.00 0.09 0.00 0.00 3.50 0.11 0.00 0.00 4.00 0.13 0.00 0.01 4.50 0.15 0.01 0.01 5.00 0.17 0.01 0.02 5.50 0.19 0.02 0.02 6.00 0.21 0.03 0.03 6.50 0.24 0.04 0.03 7.00 0.26 0.05 0.04 7.50 0.29 0.07 0.04 8.00 0.32 0.08 0.05 8.50 0.35 0.10 0.06 9.00 0.39 0.13 0.07 9.50 0.43 0.16 0.08 10.00 0.48 0.19 0.10 10.50 0.54 0.24 0.14 11.00 0.62 0.30 0.20 11.50 0.75 0.41 0.34 12.00 1.75 1.33 4.36 12.50 1.94 1.52 0.38 13.00 2.04 1.61 0.23 13.50 2.11 1.68 0.17 14.00 2.16 1.73 0.14 14.50 2.21 1.78 0.12 15.00 2.25 1.82 0.11 15.50 2.29 1.86 0.10 16.00 2.32 1.89 0.08 16.50 2.35 1.92 0.08 17.00 2.38 1.94 0.07 17.50 2.41 1.97 0.07 18.00 2.43 1.99 0.06 18.50 2.45 2.02 0.06 19.00 2.48 2.04 0.06 19.50 2.50 2.06 0.05 20.00 2.51 2.07 0.05 20.50 2.53 2.09 0.05 21.00 2.55 2.11 0.04 21.50 2.56 2.12 0.04 22.00 2.58 2.14 0.04 22.50 2.59 2.15 0.04 23.00 2.61 2.17 0.04 23.50 2.63 2.18 0.04 24.00 2.64 2.20 0.04 24.50 2.64 2.20 0.00 25.00 2.64 2.20 0.00 25.50 2.64 2.20 0.00 26.00 2.64 2.20 0.00 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 26.50 2.64 2.20 0.00 27.00 2.64 2.20 0.00 27.50 2.64 2.20 0.00 28.00 2.64 2.20 0.00 28.50 2.64 2.20 0.00 29.00 2.64 2.20 0.00 29.50 2.64 2.20 0.00 30.00 2.64 2.20 0.00 30.50 2.64 2.20 0.00 31.00 2.64 2.20 0.00 31.50 2.64 2.20 0.00 32.00 2.64 2.20 0.00 32.50 2.64 2.20 0.00 33.00 2.64 2.20 0.00 33.50 2.64 2.20 0.00 34.00 2.64 2.20 0.00 34.50 2.64 2.20 0.00 35.00 2.64 2.20 0.00 35.50 2.64 2.20 0.00 36.00 2.64 2.20 0.00 36.50 2.64 2.20 0.00 37.00 2.64 2.20 0.00 37.50 2.64 2.20 0.00 38.00 2.64 2.20 0.00 38.50 2.64 2.20 0.00 39.00 2.64 2.20 0.00 39.50 2.64 2.20 0.00 40.00 2.64 2.20 0.00 40.50 2.64 2.20 0.00 41.00 2.64 2.20 0.00 41.50 2.64 2.20 0.00 42.00 2.64 2.20 0.00 42.50 2.64 2.20 0.00 43.00 2.64 2.20 0.00 43.50 2.64 2.20 0.00 44.00 2.64 2.20 0.00 44.50 2.64 2.20 0.00 45.00 2.64 2.20 0.00 45.50 2.64 2.20 0.00 46.00 2.64 2.20 0.00 46.50 2.64 2.20 0.00 47.00 2.64 2.20 0.00 47.50 2.64 2.20 0.00 48.00 2.64 2.20 0.00 Page 46 of 71 Type II 24-hr 002YR-24.0HR Rainfall=2.64"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 6HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Underground Chambers Inflow Area = 1.360 ac, 84.34% Impervious, Inflow Depth = 2.20" for 002YR-24.0HR event Inflow = 4.70 cfs @ 11.96 hrs, Volume= 0.249 af Outflow = 3.08 cfs @ 12.04 hrs, Volume= 0.249 af, Atten= 35%, Lag= 4.8 min Primary = 3.08 cfs @ 12.04 hrs, Volume= 0.249 af Routing by Stor-Ind method, Time Span= 0.50-48.00 hrs, dt= 0.05 hrs Peak Elev= 841.65' @ 12.04 hrs Surf.Area= 0.043 ac Storage= 0.036 af Plug-Flow detention time= 14.6 min calculated for 0.249 af (100% of inflow) Center-of-Mass det. time= 14.0 min ( 790.3 - 776.3 ) Volume Invert Avail.Storage Storage Description #1A 840.25' 0.062 af 29.92'W x 63.06'L x 5.50'H Field A 0.238 af Overall - 0.084 af Embedded = 0.155 af x 40.0% Voids #2A 841.00' 0.084 af ADS_StormTech MC-3500 d +Cap x 32 Inside #1 Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap 32 Chambers in 4 Rows Cap Storage= 14.9 cf x 2 x 4 rows = 119.2 cf 0.145 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 840.25'11.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=3.06 cfs @ 12.04 hrs HW=841.64' (Free Discharge) 1=Orifice/Grate (Orifice Controls 3.06 cfs @ 4.64 fps) Page 47 of 71 Type II 24-hr 002YR-24.0HR Rainfall=2.64"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 7HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Pond 1P: Underground Chambers Inflow Primary Hydrograph Time (hours) 48464442403836343230282624222018161412108642Flow (cfs)5 4 3 2 1 0 Inflow Area=1.360 ac Peak Elev=841.65' Storage=0.036 af 4.70 cfs 3.08 cfs Page 48 of 71 Type II 24-hr 002YR-24.0HR Rainfall=2.64"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 8HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: Underground Chambers Time (hours) Inflow (cfs) Storage (acre-feet) Elevation (feet) Primary (cfs) 0.50 0.00 0.000 840.25 0.00 1.50 0.00 0.000 840.25 0.00 2.50 0.00 0.000 840.25 0.00 3.50 0.00 0.000 840.26 0.00 4.50 0.01 0.000 840.28 0.01 5.50 0.02 0.001 840.31 0.02 6.50 0.03 0.001 840.33 0.03 7.50 0.04 0.002 840.34 0.04 8.50 0.06 0.002 840.36 0.05 9.50 0.08 0.002 840.39 0.08 10.50 0.14 0.003 840.42 0.13 11.50 0.34 0.005 840.53 0.30 12.50 0.38 0.006 840.60 0.47 13.50 0.17 0.004 840.46 0.19 14.50 0.12 0.003 840.42 0.12 15.50 0.10 0.003 840.40 0.10 16.50 0.08 0.002 840.39 0.08 17.50 0.07 0.002 840.38 0.07 18.50 0.06 0.002 840.37 0.06 19.50 0.05 0.002 840.36 0.05 20.50 0.05 0.002 840.35 0.05 21.50 0.04 0.002 840.35 0.04 22.50 0.04 0.002 840.35 0.04 23.50 0.04 0.002 840.35 0.04 24.50 0.00 0.001 840.30 0.01 25.50 0.00 0.000 840.27 0.00 26.50 0.00 0.000 840.26 0.00 27.50 0.00 0.000 840.25 0.00 28.50 0.00 0.000 840.25 0.00 29.50 0.00 0.000 840.25 0.00 30.50 0.00 0.000 840.25 0.00 31.50 0.00 0.000 840.25 0.00 32.50 0.00 0.000 840.25 0.00 33.50 0.00 0.000 840.25 0.00 34.50 0.00 0.000 840.25 0.00 35.50 0.00 0.000 840.25 0.00 36.50 0.00 0.000 840.25 0.00 37.50 0.00 0.000 840.25 0.00 38.50 0.00 0.000 840.25 0.00 39.50 0.00 0.000 840.25 0.00 40.50 0.00 0.000 840.25 0.00 41.50 0.00 0.000 840.25 0.00 42.50 0.00 0.000 840.25 0.00 43.50 0.00 0.000 840.25 0.00 44.50 0.00 0.000 840.25 0.00 45.50 0.00 0.000 840.25 0.00 46.50 0.00 0.000 840.25 0.00 47.50 0.00 0.000 840.25 0.00 Page 49 of 71 Type II 24-hr 010YR-24.0HR Rainfall=3.84"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 9HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PRO: 1.36 ACRES Runoff = 7.04 cfs @ 11.96 hrs, Volume= 0.383 af, Depth= 3.38" Routed to Pond 1P : Underground Chambers Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.50-48.00 hrs, dt= 0.05 hrs Type II 24-hr 010YR-24.0HR Rainfall=3.84" Area (ac) CN Description 0.213 84 50-75% Grass cover, Fair, HSG D 0.793 98 Paved parking, HSG D 0.354 98 Roofs, HSG D 1.360 96 Weighted Average 0.213 15.66% Pervious Area 1.147 84.34% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment PRO: 1.36 ACRES Runoff Hydrograph Time (hours) 48464442403836343230282624222018161412108642Flow (cfs)7 6 5 4 3 2 1 0 Type II 24-hr 010YR-24.0HR Rainfall=3.84" Runoff Area=1.360 ac Runoff Volume=0.383 af Runoff Depth=3.38" Tc=6.0 min CN=96 7.04 cfs Page 50 of 71 Type II 24-hr 010YR-24.0HR Rainfall=3.84"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 10HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment PRO: 1.36 ACRES Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.06 0.00 0.00 2.00 0.08 0.00 0.00 2.50 0.11 0.00 0.01 3.00 0.13 0.01 0.01 3.50 0.16 0.01 0.02 4.00 0.18 0.02 0.02 4.50 0.21 0.03 0.03 5.00 0.24 0.04 0.04 5.50 0.27 0.06 0.05 6.00 0.31 0.08 0.05 6.50 0.34 0.10 0.06 7.00 0.38 0.12 0.07 7.50 0.42 0.15 0.08 8.00 0.46 0.18 0.08 8.50 0.51 0.21 0.10 9.00 0.56 0.26 0.13 9.50 0.63 0.31 0.14 10.00 0.70 0.36 0.17 10.50 0.78 0.44 0.22 11.00 0.90 0.54 0.32 11.50 1.09 0.71 0.53 12.00 2.55 2.11 6.51 12.50 2.82 2.38 0.56 13.00 2.96 2.52 0.34 13.50 3.07 2.62 0.26 14.00 3.15 2.70 0.20 14.50 3.22 2.77 0.18 15.00 3.28 2.83 0.16 15.50 3.33 2.88 0.14 16.00 3.38 2.93 0.12 16.50 3.42 2.97 0.11 17.00 3.46 3.01 0.11 17.50 3.50 3.05 0.10 18.00 3.54 3.08 0.09 18.50 3.57 3.11 0.09 19.00 3.60 3.15 0.08 19.50 3.63 3.17 0.08 20.00 3.66 3.20 0.07 20.50 3.68 3.22 0.07 21.00 3.70 3.25 0.07 21.50 3.73 3.27 0.06 22.00 3.75 3.29 0.06 22.50 3.77 3.32 0.06 23.00 3.80 3.34 0.06 23.50 3.82 3.36 0.06 24.00 3.84 3.38 0.06 24.50 3.84 3.38 0.00 25.00 3.84 3.38 0.00 25.50 3.84 3.38 0.00 26.00 3.84 3.38 0.00 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 26.50 3.84 3.38 0.00 27.00 3.84 3.38 0.00 27.50 3.84 3.38 0.00 28.00 3.84 3.38 0.00 28.50 3.84 3.38 0.00 29.00 3.84 3.38 0.00 29.50 3.84 3.38 0.00 30.00 3.84 3.38 0.00 30.50 3.84 3.38 0.00 31.00 3.84 3.38 0.00 31.50 3.84 3.38 0.00 32.00 3.84 3.38 0.00 32.50 3.84 3.38 0.00 33.00 3.84 3.38 0.00 33.50 3.84 3.38 0.00 34.00 3.84 3.38 0.00 34.50 3.84 3.38 0.00 35.00 3.84 3.38 0.00 35.50 3.84 3.38 0.00 36.00 3.84 3.38 0.00 36.50 3.84 3.38 0.00 37.00 3.84 3.38 0.00 37.50 3.84 3.38 0.00 38.00 3.84 3.38 0.00 38.50 3.84 3.38 0.00 39.00 3.84 3.38 0.00 39.50 3.84 3.38 0.00 40.00 3.84 3.38 0.00 40.50 3.84 3.38 0.00 41.00 3.84 3.38 0.00 41.50 3.84 3.38 0.00 42.00 3.84 3.38 0.00 42.50 3.84 3.38 0.00 43.00 3.84 3.38 0.00 43.50 3.84 3.38 0.00 44.00 3.84 3.38 0.00 44.50 3.84 3.38 0.00 45.00 3.84 3.38 0.00 45.50 3.84 3.38 0.00 46.00 3.84 3.38 0.00 46.50 3.84 3.38 0.00 47.00 3.84 3.38 0.00 47.50 3.84 3.38 0.00 48.00 3.84 3.38 0.00 Page 51 of 71 Type II 24-hr 010YR-24.0HR Rainfall=3.84"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 11HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Underground Chambers Inflow Area = 1.360 ac, 84.34% Impervious, Inflow Depth = 3.38" for 010YR-24.0HR event Inflow = 7.04 cfs @ 11.96 hrs, Volume= 0.383 af Outflow = 4.13 cfs @ 12.05 hrs, Volume= 0.383 af, Atten= 41%, Lag= 5.4 min Primary = 4.13 cfs @ 12.05 hrs, Volume= 0.383 af Routing by Stor-Ind method, Time Span= 0.50-48.00 hrs, dt= 0.05 hrs Peak Elev= 842.40' @ 12.05 hrs Surf.Area= 0.043 ac Storage= 0.063 af Plug-Flow detention time= 12.7 min calculated for 0.383 af (100% of inflow) Center-of-Mass det. time= 12.9 min ( 778.3 - 765.4 ) Volume Invert Avail.Storage Storage Description #1A 840.25' 0.062 af 29.92'W x 63.06'L x 5.50'H Field A 0.238 af Overall - 0.084 af Embedded = 0.155 af x 40.0% Voids #2A 841.00' 0.084 af ADS_StormTech MC-3500 d +Cap x 32 Inside #1 Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap 32 Chambers in 4 Rows Cap Storage= 14.9 cf x 2 x 4 rows = 119.2 cf 0.145 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 840.25'11.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=4.12 cfs @ 12.05 hrs HW=842.39' (Free Discharge) 1=Orifice/Grate (Orifice Controls 4.12 cfs @ 6.25 fps) Page 52 of 71 Type II 24-hr 010YR-24.0HR Rainfall=3.84"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 12HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Pond 1P: Underground Chambers Inflow Primary Hydrograph Time (hours) 48464442403836343230282624222018161412108642Flow (cfs)7 6 5 4 3 2 1 0 Inflow Area=1.360 ac Peak Elev=842.40' Storage=0.063 af 7.04 cfs 4.13 cfs Page 53 of 71 Type II 24-hr 010YR-24.0HR Rainfall=3.84"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 13HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: Underground Chambers Time (hours) Inflow (cfs) Storage (acre-feet) Elevation (feet) Primary (cfs) 0.50 0.00 0.000 840.25 0.00 1.50 0.00 0.000 840.25 0.00 2.50 0.01 0.000 840.26 0.00 3.50 0.02 0.001 840.29 0.01 4.50 0.03 0.001 840.33 0.03 5.50 0.05 0.002 840.35 0.04 6.50 0.06 0.002 840.37 0.06 7.50 0.08 0.002 840.38 0.07 8.50 0.10 0.003 840.40 0.09 9.50 0.14 0.003 840.43 0.13 10.50 0.22 0.004 840.48 0.21 11.50 0.53 0.006 840.61 0.49 12.50 0.56 0.008 840.73 0.82 13.50 0.26 0.005 840.51 0.27 14.50 0.18 0.004 840.46 0.18 15.50 0.14 0.003 840.44 0.15 16.50 0.11 0.003 840.42 0.12 17.50 0.10 0.003 840.41 0.10 18.50 0.09 0.003 840.40 0.09 19.50 0.08 0.002 840.38 0.08 20.50 0.07 0.002 840.38 0.07 21.50 0.06 0.002 840.37 0.06 22.50 0.06 0.002 840.37 0.06 23.50 0.06 0.002 840.37 0.06 24.50 0.00 0.001 840.31 0.01 25.50 0.00 0.000 840.27 0.00 26.50 0.00 0.000 840.26 0.00 27.50 0.00 0.000 840.25 0.00 28.50 0.00 0.000 840.25 0.00 29.50 0.00 0.000 840.25 0.00 30.50 0.00 0.000 840.25 0.00 31.50 0.00 0.000 840.25 0.00 32.50 0.00 0.000 840.25 0.00 33.50 0.00 0.000 840.25 0.00 34.50 0.00 0.000 840.25 0.00 35.50 0.00 0.000 840.25 0.00 36.50 0.00 0.000 840.25 0.00 37.50 0.00 0.000 840.25 0.00 38.50 0.00 0.000 840.25 0.00 39.50 0.00 0.000 840.25 0.00 40.50 0.00 0.000 840.25 0.00 41.50 0.00 0.000 840.25 0.00 42.50 0.00 0.000 840.25 0.00 43.50 0.00 0.000 840.25 0.00 44.50 0.00 0.000 840.25 0.00 45.50 0.00 0.000 840.25 0.00 46.50 0.00 0.000 840.25 0.00 47.50 0.00 0.000 840.25 0.00 Page 54 of 71 Type II 24-hr 100YR-24.0HR Rainfall=6.48"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 14HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment PRO: 1.36 ACRES Runoff = 12.11 cfs @ 11.96 hrs, Volume= 0.681 af, Depth= 6.01" Routed to Pond 1P : Underground Chambers Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.50-48.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR-24.0HR Rainfall=6.48" Area (ac) CN Description 0.213 84 50-75% Grass cover, Fair, HSG D 0.793 98 Paved parking, HSG D 0.354 98 Roofs, HSG D 1.360 96 Weighted Average 0.213 15.66% Pervious Area 1.147 84.34% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment PRO: 1.36 ACRES Runoff Hydrograph Time (hours) 48464442403836343230282624222018161412108642Flow (cfs)13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 100YR-24.0HR Rainfall=6.48" Runoff Area=1.360 ac Runoff Volume=0.681 af Runoff Depth=6.01" Tc=6.0 min CN=96 12.11 cfs Page 55 of 71 Type II 24-hr 100YR-24.0HR Rainfall=6.48"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 15HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment PRO: 1.36 ACRES Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.50 0.03 0.00 0.00 1.00 0.07 0.00 0.00 1.50 0.10 0.00 0.01 2.00 0.14 0.01 0.02 2.50 0.18 0.02 0.04 3.00 0.22 0.04 0.05 3.50 0.27 0.06 0.06 4.00 0.31 0.08 0.07 4.50 0.36 0.11 0.08 5.00 0.41 0.14 0.10 5.50 0.46 0.18 0.11 6.00 0.52 0.22 0.12 6.50 0.58 0.27 0.13 7.00 0.64 0.32 0.14 7.50 0.71 0.37 0.15 8.00 0.78 0.43 0.17 8.50 0.86 0.50 0.20 9.00 0.95 0.59 0.25 9.50 1.06 0.68 0.26 10.00 1.17 0.79 0.32 10.50 1.32 0.93 0.41 11.00 1.52 1.12 0.57 11.50 1.83 1.41 0.95 12.00 4.30 3.83 11.18 12.50 4.76 4.30 0.95 13.00 5.00 4.54 0.58 13.50 5.18 4.71 0.44 14.00 5.31 4.84 0.34 14.50 5.43 4.96 0.30 15.00 5.53 5.06 0.27 15.50 5.62 5.15 0.24 16.00 5.70 5.23 0.21 16.50 5.77 5.30 0.19 17.00 5.84 5.37 0.18 17.50 5.91 5.44 0.17 18.00 5.97 5.50 0.16 18.50 6.02 5.55 0.15 19.00 6.08 5.60 0.14 19.50 6.12 5.65 0.13 20.00 6.17 5.70 0.12 20.50 6.21 5.74 0.11 21.00 6.25 5.78 0.11 21.50 6.29 5.82 0.11 22.00 6.33 5.86 0.11 22.50 6.37 5.90 0.10 23.00 6.41 5.93 0.10 23.50 6.44 5.97 0.10 24.00 6.48 6.01 0.10 24.50 6.48 6.01 0.00 25.00 6.48 6.01 0.00 25.50 6.48 6.01 0.00 26.00 6.48 6.01 0.00 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 26.50 6.48 6.01 0.00 27.00 6.48 6.01 0.00 27.50 6.48 6.01 0.00 28.00 6.48 6.01 0.00 28.50 6.48 6.01 0.00 29.00 6.48 6.01 0.00 29.50 6.48 6.01 0.00 30.00 6.48 6.01 0.00 30.50 6.48 6.01 0.00 31.00 6.48 6.01 0.00 31.50 6.48 6.01 0.00 32.00 6.48 6.01 0.00 32.50 6.48 6.01 0.00 33.00 6.48 6.01 0.00 33.50 6.48 6.01 0.00 34.00 6.48 6.01 0.00 34.50 6.48 6.01 0.00 35.00 6.48 6.01 0.00 35.50 6.48 6.01 0.00 36.00 6.48 6.01 0.00 36.50 6.48 6.01 0.00 37.00 6.48 6.01 0.00 37.50 6.48 6.01 0.00 38.00 6.48 6.01 0.00 38.50 6.48 6.01 0.00 39.00 6.48 6.01 0.00 39.50 6.48 6.01 0.00 40.00 6.48 6.01 0.00 40.50 6.48 6.01 0.00 41.00 6.48 6.01 0.00 41.50 6.48 6.01 0.00 42.00 6.48 6.01 0.00 42.50 6.48 6.01 0.00 43.00 6.48 6.01 0.00 43.50 6.48 6.01 0.00 44.00 6.48 6.01 0.00 44.50 6.48 6.01 0.00 45.00 6.48 6.01 0.00 45.50 6.48 6.01 0.00 46.00 6.48 6.01 0.00 46.50 6.48 6.01 0.00 47.00 6.48 6.01 0.00 47.50 6.48 6.01 0.00 48.00 6.48 6.01 0.00 Page 56 of 71 Type II 24-hr 100YR-24.0HR Rainfall=6.48"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 16HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Underground Chambers Inflow Area = 1.360 ac, 84.34% Impervious, Inflow Depth = 6.01" for 100YR-24.0HR event Inflow = 12.11 cfs @ 11.96 hrs, Volume= 0.681 af Outflow = 6.36 cfs @ 12.06 hrs, Volume= 0.681 af, Atten= 47%, Lag= 5.9 min Primary = 6.36 cfs @ 12.06 hrs, Volume= 0.681 af Routing by Stor-Ind method, Time Span= 0.50-48.00 hrs, dt= 0.05 hrs Peak Elev= 844.72' @ 12.06 hrs Surf.Area= 0.043 ac Storage= 0.127 af Plug-Flow detention time= 12.2 min calculated for 0.680 af (100% of inflow) Center-of-Mass det. time= 12.3 min ( 764.9 - 752.7 ) Volume Invert Avail.Storage Storage Description #1A 840.25' 0.062 af 29.92'W x 63.06'L x 5.50'H Field A 0.238 af Overall - 0.084 af Embedded = 0.155 af x 40.0% Voids #2A 841.00' 0.084 af ADS_StormTech MC-3500 d +Cap x 32 Inside #1 Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap 32 Chambers in 4 Rows Cap Storage= 14.9 cf x 2 x 4 rows = 119.2 cf 0.145 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 840.25'11.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=6.31 cfs @ 12.06 hrs HW=844.65' (Free Discharge) 1=Orifice/Grate (Orifice Controls 6.31 cfs @ 9.55 fps) Page 57 of 71 Type II 24-hr 100YR-24.0HR Rainfall=6.48"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 17HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Pond 1P: Underground Chambers Inflow Primary Hydrograph Time (hours) 48464442403836343230282624222018161412108642Flow (cfs)13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=1.360 ac Peak Elev=844.72' Storage=0.127 af 12.11 cfs 6.36 cfs Page 58 of 71 Type II 24-hr 100YR-24.0HR Rainfall=6.48"2023-119_Underground Detention_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 18HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: Underground Chambers Time (hours) Inflow (cfs) Storage (acre-feet) Elevation (feet) Primary (cfs) 0.50 0.00 0.000 840.25 0.00 1.50 0.01 0.000 840.25 0.00 2.50 0.04 0.001 840.32 0.02 3.50 0.06 0.002 840.36 0.05 4.50 0.08 0.002 840.38 0.08 5.50 0.11 0.003 840.41 0.10 6.50 0.13 0.003 840.43 0.13 7.50 0.15 0.003 840.44 0.15 8.50 0.20 0.004 840.47 0.19 9.50 0.26 0.004 840.50 0.26 10.50 0.41 0.006 840.57 0.39 11.50 0.95 0.009 840.75 0.89 12.50 0.95 0.029 841.45 2.73 13.50 0.44 0.006 840.60 0.46 14.50 0.30 0.005 840.53 0.31 15.50 0.24 0.004 840.50 0.25 16.50 0.19 0.004 840.47 0.20 17.50 0.17 0.004 840.46 0.18 18.50 0.15 0.003 840.44 0.15 19.50 0.13 0.003 840.43 0.13 20.50 0.11 0.003 840.42 0.11 21.50 0.11 0.003 840.41 0.11 22.50 0.10 0.003 840.41 0.11 23.50 0.10 0.003 840.41 0.10 24.50 0.00 0.001 840.32 0.02 25.50 0.00 0.000 840.27 0.00 26.50 0.00 0.000 840.26 0.00 27.50 0.00 0.000 840.25 0.00 28.50 0.00 0.000 840.25 0.00 29.50 0.00 0.000 840.25 0.00 30.50 0.00 0.000 840.25 0.00 31.50 0.00 0.000 840.25 0.00 32.50 0.00 0.000 840.25 0.00 33.50 0.00 0.000 840.25 0.00 34.50 0.00 0.000 840.25 0.00 35.50 0.00 0.000 840.25 0.00 36.50 0.00 0.000 840.25 0.00 37.50 0.00 0.000 840.25 0.00 38.50 0.00 0.000 840.25 0.00 39.50 0.00 0.000 840.25 0.00 40.50 0.00 0.000 840.25 0.00 41.50 0.00 0.000 840.25 0.00 42.50 0.00 0.000 840.25 0.00 43.50 0.00 0.000 840.25 0.00 44.50 0.00 0.000 840.25 0.00 45.50 0.00 0.000 840.25 0.00 46.50 0.00 0.000 840.25 0.00 47.50 0.00 0.000 840.25 0.00 Page 59 of 71 PRECAST CONCRETE ADJUSTING RING AS NEEDED (4 MAX.) PRECAST CONCRETE SECTIONS OUTLET CONTROL STRUCTURE DETAIL NOT TO SCALE ASPHALTIC MASTIC OR BUTYL RUBBER SEAL BETWEEN JOINTS 12" THICK STEEL PLATE RESTRICTOR #4 BAR @ 12" o.c. EACH WAY (STEEL MESH AREA = 0.12 SQ. IN./SQ. FT.)15" RCPINFLUENTPIPE1 5 " RC POUT L E TPI P E 12" THICK STEEL PLATE RESTRICTOR 1/2" THICK STEEL PLATE ANGLE BRACKET (TYP.) MANHOLE BASE SET ON 6" OF #8 OR #2 STONECOMPACTED SUBGRADE 24" DIA. NEENAH R-1772 T.O.R.= 850.97 FINISH GRADE TOP OF STEEL PLATE ELEV = 844.72 FRONT VIEW 4' DIA. 11" DIA. ORIFICE INV. = 840.25 GALVANIZED STEEL GRATE (APPROX. 18"x18"x4") CENTERED ON EACH ORIFICE OPENING AND WELDED TO STEEL PLATE GALVANIZED STEEL GRATE (APPROX. 18"x18"x4") CENTERED ON ORIFICE OPENING AND WELDED TO STEEL PLATE NOTE: SEE "STANDARD 4' STORM MANHOLE DETAIL" ON THIS SHEET FOR ADDITION DETAIL INFORMATION. MANHOLE BASE SET ON 6" OF #8 OR #2 STONECOMPACTED SUBGRADE 24" DIA. NEENAH R-1772 T.O.R.= 850.97 FINISH GRADE TOP OF STEEL PLATE 100 YR. ELEV = 844.72 SIDE VIEW 11" DIA. ORIFICE INV. = 840.25 15" RCP INFLUENT INV. = 841.00 15" RCP OUTLET INV. = 840.25 BASE 6" OR 8" PER SECTION MANHOLE BOTTOM INV. = 838.2516"PLASTIC ENCAPSULATED STEEL MANHOLE STEPS O-RING GASKET ASPHALTIC MASTIC OR BUTYL RUBBER SEAL AT JOINTS 6" PERFORATED PERIMETER DRAIN PIPE, INV. = 840.25 6" PERFORATED PERIMETER DRAIN PIPE Page 60 of 71 TLF, Inc. Project No. 2023-119 Appendix E Proposed Water Quality Calculations Page 61 of 71 BMP Aqua Swirl XC-6. WQ1" 24hour = 1.84 cfs Routing Diagram for 2023-119_Proposed WQ_2023-09-13 Prepared by TLF, Inc, Printed 9/19/2023 HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link Page 62 of 71 Type II 24-hr WQ 1in - 24HR Rainfall=1.00"2023-119_Proposed WQ_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Events for Subcatchment BMP: Aqua Swirl XC-6. WQ1" 24hour = 1.84 cfs Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) WQ 1in - 24HR 1.00 1.84 0.094 0.83 Page 63 of 71 2023-119_Proposed WQ_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 2HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 WQ 1in - 24HR Type II 24-hr Default 24.00 1 1.00 2 Page 64 of 71 2023-119_Proposed WQ_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 3HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 1.360 99 (BMP) 1.360 99 TOTAL AREA Page 65 of 71 Type II 24-hr WQ 1in - 24HR Rainfall=1.00"2023-119_Proposed WQ_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 4HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment BMP: Aqua Swirl XC-6. WQ1" 24hour = 1.84 cfs Runoff = 1.84 cfs @ 11.96 hrs, Volume= 0.094 af, Depth> 0.83" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr WQ 1in - 24HR Rainfall=1.00" Area (ac) CN Description * 1.360 99 1.360 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment BMP: Aqua Swirl XC-6. WQ1" 24hour = 1.84 cfs Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)2 1 0 Type II 24-hr WQ 1in - 24HR Rainfall=1.00" Runoff Area=1.360 ac Runoff Volume=0.094 af Runoff Depth>0.83" Tc=6.0 min CN=99 1.84 cfs Page 66 of 71 Type II 24-hr WQ 1in - 24HR Rainfall=1.00"2023-119_Proposed WQ_2023-09-13 Printed 9/19/2023Prepared by TLF, Inc Page 5HydroCAD® 10.20-3c s/n 10212 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment BMP: Aqua Swirl XC-6. WQ1" 24hour = 1.84 cfs Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.06 0.01 0.01 5.25 0.07 0.01 0.01 5.50 0.07 0.02 0.01 5.75 0.08 0.02 0.01 6.00 0.08 0.02 0.01 6.25 0.08 0.03 0.02 6.50 0.09 0.03 0.02 6.75 0.09 0.03 0.02 7.00 0.10 0.03 0.02 7.25 0.10 0.04 0.02 7.50 0.11 0.04 0.02 7.75 0.11 0.05 0.02 8.00 0.12 0.05 0.02 8.25 0.13 0.05 0.02 8.50 0.13 0.06 0.03 8.75 0.14 0.06 0.03 9.00 0.15 0.07 0.03 9.25 0.15 0.08 0.04 9.50 0.16 0.08 0.04 9.75 0.17 0.09 0.04 10.00 0.18 0.10 0.04 10.25 0.19 0.11 0.05 10.50 0.20 0.12 0.06 10.75 0.22 0.13 0.07 11.00 0.24 0.15 0.08 11.25 0.26 0.17 0.11 11.50 0.28 0.19 0.14 11.75 0.39 0.29 0.64 12.00 0.66 0.56 1.70 12.25 0.71 0.60 0.23 12.50 0.73 0.63 0.15 12.75 0.76 0.65 0.11 13.00 0.77 0.66 0.09 13.25 0.79 0.68 0.08 13.50 0.80 0.69 0.07 13.75 0.81 0.70 0.06 14.00 0.82 0.71 0.05 14.25 0.83 0.72 0.05 14.50 0.84 0.73 0.05 14.75 0.85 0.74 0.04 15.00 0.85 0.74 0.04 15.25 0.86 0.75 0.04 15.50 0.87 0.76 0.04 15.75 0.87 0.76 0.03 16.00 0.88 0.77 0.03 16.25 0.89 0.78 0.03 16.50 0.89 0.78 0.03 16.75 0.90 0.79 0.03 17.00 0.90 0.79 0.03 17.25 0.91 0.80 0.03 17.50 0.91 0.80 0.03 17.75 0.92 0.81 0.03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 18.00 0.92 0.81 0.02 18.25 0.93 0.81 0.02 18.50 0.93 0.82 0.02 18.75 0.93 0.82 0.02 19.00 0.94 0.83 0.02 19.25 0.94 0.83 0.02 19.50 0.95 0.83 0.02 19.75 0.95 0.84 0.02 20.00 0.95 0.84 0.02 Page 67 of 71 City of Indianapolis Stormwater Quality Unit (SQU) Selection Guide Pg. 1 02/11/2020 Version 17.0 (Check http://www.indy.gov/eGov/City/DPW/Business/Specs/Pages/UpdatedStormWaterManual.aspx for current Selection Guide) Performance Matrix for Manufactured SQUs that are approved for use as post-construction water quality units in the City of Indianapolis and in compliance with the Stormwater Design and Construction Specifications Manual PLEASE NOTE: All SQUs shall be configured as off-line units unless approved for on-line use. On-line units must document the peak 10-year flow (per the Stormwater Design and Construction Specification Manual) is less than the approved maximum10-yr flow rate. Rate Based SQUs - Table 1 Manufactured SQU SQU System Model Max Treatment Flow (cfs) Max 10-yr On-Line Flow Rate (cfs) Cleanout Depth (Inches) SC-3 0.39 N/A 9 SC-4 0.70 N/A 9 SC-5 1.09 N/A 9 SC-6 1.57 N/A 9 SC-7 2.14 N/A 9 SC-8 2.80 N/A 9 SC-9 3.54 N/A 9 SC-10 4.37 N/A 9 SC-11 5.29 N/A 9 SciClone1 SC-12 6.30 N/A 9 CDS-3 0.52 1.04 9 CDS-4 0.93 1.86 9 CDS-5 1.5 3.00 9 CDS-6 2.1 4.2 9 CDS-7 2.8 5.60 9 CDS-8 3.7 7.4 9 CDS-10 5.8 11.6 9 CDS Technologies1 CDS-12 8.4 16.8 9 DVS-36C 0.56 1.12 9 DVS-48C 1.00 2.00 9 DVS-60C 1.56 3.12 9 DVS-72C 2.25 4.50 9 DVS-84C 3.06 6.12 9 DVS-96C 4.00 8.00 9 DVS-120C 6.25 12.50 9 DVS1 DVS-144C 9.00 18.00 9 Page 68 of 71 City of Indianapolis Stormwater Quality Unit (SQU) Selection Guide Pg. 2 02/11/2020 Version 17.0 Manufactured SQU SQU System Model Max Treatment Flow (cfs) Max 10-yr On-Line Flow Rate (cfs) Cleanout Depth (Inches) 4-ft 1.12 2.95 9 6-ft 2.52 6.63 12 8-ft 4.49 11.81 15 10-ft 7.00 18.40 18 Hydro International Downstream Defender1 12 ft 10.08 26.51 21 3-ft 0.85 1.84 9 4-ft 1.5 3.24 9 5-ft 2.35 5.08 9 6-ft 3.38 7.30 9 7-ft 4.60 9.94 9 Hydro International First Defense High Capacity1 8-ft 6.00 12.96 9 HS-3 0.50 1.00 6 HS-4 0.88 1.76 6 HS-5 1.37 2.74 6 HS-6 1.98 3.96 6 HS-7 2.69 5.38 6 HS-8 3.52 7.04 6 HS-9 4.45 8.9 6 HS-10 5.49 10.98 6 HS-11 6.65 13.3 6 HydroStorm by Hydroworks, LLC1 HS-12 7.91 15.82 6 XC-2 0.57 1.16 6 XC-3 1.13 2.30 6 XC-4 1.86 3.79 6 XC-5 2.78 5.66 6 XC-6 3.88 7.90 6 XC-7 5.17 10.52 6 XC-8 6.64 13.51 6 XC-9 8.29 16.87 6 XC-10 10.13 20.62 6 XC-11 12.15 24.73 6 XC-12 14.35 29.20 6 AquaShield Aqua-Swirl Xcelerator1 XC-13 15.53 31.60 6 CS-4 1.80 4.03 9 CS-5 2.81 6.29 9 CS-6 4.05 9.07 9 CS-8 7.20 16.1 9 CS-10 11.3 25.3 9 Contech Cascade Separator CS-12 16.2 36.3 9 Page 69 of 71 City of Indianapolis Stormwater Quality Unit (SQU) Selection Guide Pg. 3 02/11/2020 Version 17.0 Manufactured SQU SQU System Model Max Treatment Flow (cfs) Max 10-yr On-Line Flow Rate (cfs) Cleanout Depth (Inches) 2-4 0.62 2.57 6 3-6 1.4 5.80 6 3-8 1.87 7.75 6 4-8 2.49 10.31 6 5-10 3.89 16.11 6 6-12 5.6 23.19 6 6-13.75 6.42 26.59 6 7-14 7.62 31.56 6 7-15 8.17 33.84 6 8-14 8.71 36.08 6 8-16 9.96 41.25 6 9-18 12.6 52.19 6 10-17 13.22 54.76 6 10-20 15.56 64.45 6 12-21 19.6 81.18 6 Oldcastle NSBB-HVT 12-24 22.4 92.78 6 AS-2 0.36 0.73 7 AS-3 0.71 1.44 7 AS-4 1.18 2.39 7 AS-5 1.46 2.96 7 AS-6 2.11 4.28 7 AS-7 2.87 5.82 7 AS-8 3.74 7.59 7 AS-9 4.73 9.59 7 AS-10 5.84 11.84 7 AS-11 7.07 14.34 7 AS-12 8.42 17.08 7 AquaShield Aqua Swirl AS-13 9.87 20.02 7 S3 0.70 1.40 10 S4 1.25 2.50 10 S5 1.95 3.90 10 S6 2.80 5.60 10 S8 5.00 10.00 10 ADS Barracuda S10 7.80 15.60 10 1 Installed in the configuration as reviewed by NJCAT only Page 70 of 71 Page 71 of 71