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HomeMy WebLinkAboutDrainage Report 01-13-21 Drainage Report for Carmel Clay Schools Carmel Middle School Proposed Site Improvements 300 South Guilford Road Carmel, Indiana 46032 Prepared by: TLF, Inc. 3901 West 86th Street, Suite 200 Indianapolis, IN 46268 Phone (317) 334-1500 Project No: 2020-367 Submitted by: Brittany N. Heidenreich, PE January 13, 2021 Carmel Clay Schools – Carmel Clay Middle School Proposed Site Improvements January 13, 2021 TLF, Inc. Project No. 2020-367 Table of Contents Project Narrative I. Project Location II. Project Description III. Existing Drainage Conditions IV. Proposed Storm Sewer Design V. Proposed Drainage Conditions VI. Proposed Water Quality Design VII. Summary and Conclusions Appendices Appendix A - Maps · Site Location Map · Soils Map and Data · Flood Insurance Rate Map Appendix B – Existing Drainage Conditions · Existing Drainage Conditions Exhibits – B1-B3 · Hydraflow Storm Sewer Model – Existing Line A · Hydraflow Storm Sewer Model – Existing Corrected Line A · Hydraflow Storm Sewer Model – Existing Line C Appendix C - Proposed Storm Sewer Calculations · Rainfall Data · Inlet Basin Area Exhibits – C1-C3 · Runoff Coefficient Calculations · Hydraflow Storm Sewer Model – Proposed Line A · Hydraflow Storm Sewer Model – Proposed Line C · Storm Sewer Structure Data Table Appendix D - Proposed Drainage Conditions · Proposed Drainage Conditions Exhibits – D1-D3 · HydroCAD Model Appendix E - Proposed Water Quality Calculations · Water Quality Curve Number Calculation · Water Quality HydroCAD Model · Water Quality Unit Selection Table · Water Quality Unit Detail Appendix F – Previous Drainage Reports · Hydrology Report For Addition/Renovation to Carmel Jr. High School by TLF dated August 6, 2002 Carmel Clay Schools – Carmel Clay Middle School Proposed Site Improvements January 13, 2021 TLF, Inc. Project No. 2020-367 Project Narrative I. Project Location The proposed project is located at 300 South Guilford on the Carmel Middle School Campus, Carmel, Indiana. The site does not lie within a floodway or floodplain per FEMA panel 18057C0207G effective November 19, 2014. Refer to the Site Location Map and Flood Insurance Rate Map provided in Appendix A. II. Project Description The proposed project is made up of 3 separate locations on the site. The main part of the project lies in the existing parking lot on east side of the middle school and consists of a revised parking lot layout, milling of existing asphalt, and additional sidewalk. The second area of the project is at the south with a new curb cut and drive at Grand Boulevard with a third area consisting of a small walk addition located west of the middle school. The proposed site improvements will disturb approximately 1.59 acres of land, which does not include 0.84 acres of milled asphalt. Associated infrastructure including storm sewer, a water quality unit, and a small bioretention basin are also included as part of this project. III. Existing Drainage Conditions The existing project site is both impervious asphalt parking lot and pervious lawn area which sheet drains in a northerly direction to the Guilford Avenue Arm of Cool Creek. The site soils mainly consist of Crosby silt loam, Brookston silty clay loam, and Shoals silt loam, see Soil Map and related soil data in Appendix A. An Existing Drainage Conditions Exhibit is provided in Appendix B. An existing drainage report from 2002 from an addition/renovation to Carmel Jr. High School has been provided in Appendix F. There are three storm lines that discharge to the Guilford Avenue Arm of Cool Creek: Line A, Line B, and Line C. The Hydraflow models for Lines A and C were modified in 2004 with some additional site improvements that occurred. A drainage report/narrative could not be located with those updated models, so the model input/output for Lines A and C has been included in Appendix B. IV. Proposed Storm Sewer Design The stormwater runoff from the three proposed project areas will drain to a combination of both existing and new inlets on the three existing storm sewer lines that all drain to the north to the Guilford Avenue Arm of Cool Creek. In the east parking lot project area, the area located south of the center curb cut to be demolished, is currently parking lot and pavement and drains to Storm Sewer Line C. This storm sewer line parallels Guilford Road and discharges into the north drainage ditch. A vehicular drop off and additional pedestrian circulation is proposed and will increase the proposed impervious surface to Line C by 0.22 acres. This additional impervious surface has been added to the Hydraflow storm sewer model, which shows a 2-3% increase in total system flow. North of the demolished curb cut, the east parking lot drains both to Storm Sewer Line B Carmel Clay Schools – Carmel Clay Middle School Proposed Site Improvements January 13, 2021 TLF, Inc. Project No. 2020-367 and Storm Sewer Line A. In this area, the Hydraflow storm sewer model has not been updated since no additional impervious surface is being added in this area. The impervious surface in this area is reduced by 0.21 acres, resulting in a total increase of impervious surface for the east parking lot by 0.01 acres. In the west sidewalk project area, the existing surface is turf grass. The proposed concrete sidewalk drains to 4 existing inlets located in the grass and parking lot that are part of Storm Sewer Line A. The impervious surface for the west sidewalk increases by 0.05 acres. This additional impervious surface has been added to the Hydraflow storm sewer model, which shows less than a 0.5% increase in total system flow. In the south entrance project area, the existing surface is turf grass. The proposed drive will drain to the proposed bioretention basin. The outlet pipe from the proposed bioretention basin will connect to the existing 18” RCP at the upstream end of Storm Sewer Line C. The proposed asphalt drive and concrete sidewalk results in a total increase of impervious surface for the south entrance by 0.22 acres. This additional impervious surface has been added to the Hydraflow storm sewer model, which shows a 2-3% increase in total system flow. The Proposed Storm Sewer Exhibits, calculations, and pipe sizes are provided in Appendix C. V. Proposed Drainage Design The existing Storm Sewer Line C flow exceeds the pipe capacity of the existing 24” storm sewer. A small bioretention area is proposed west of the south entrance to detain the additional impervious surface of 0.22 acres from the proposed asphalt drive and concrete sidewalk. This is the only area identified on site as a location for additional detention measures. The HydroCAD model for the bioretention area is provided in Appendix D VI. Proposed Water Quality Design The proposed site improvements will utilize a manufactured water quality device to meet the water quality requirements of the 1-inch 24-hour event of 0.49 cfs for only the additional impervious surface area of 0.28 acres. An offline hydrodynamic separator (Aqua-Swirl AS-3) that has a treatment capacity of 0.71 cfs has been provided on existing storm sewer Line A. The water quality unit will be installed offline of the existing 30” rcp pipe in a horseshoe configuration. The stormwater quality calculations can be found in Appendix E. VII. Summary and Conclusions The drainage from the proposed site has been designed in accordance with the City of Carmel Stormwater Technical Standards Manual limiting stormwater runoff from the site, therefore no adverse impacts are anticipated to affect adjacent or downstream landowners. This project will disturb approximately 1.59 acres of the overall site. Erosion control measures will be implemented before construction begins and maintained during construction to comply with IDEM Rule 5, Notice of Intent for Construction and Land Disturbance. Carmel Clay Schools – Carmel Clay Middle School Proposed Site Improvements January 13, 2021 TLF, Inc. Project No. 2020-367 Appendix A Maps Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 1/7/2021 Page 1 of 344250404425130442522044253104425400442549044255804425040442513044252204425310442540044254904425580572710572800572890572980573070573160573250573340573430573520 572710 572800 572890 572980 573070 573160 573250 573340 573430 573520 39° 58' 38'' N 86° 8' 56'' W39° 58' 38'' N86° 8' 18'' W39° 58' 19'' N 86° 8' 56'' W39° 58' 19'' N 86° 8' 18'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 16N WGS84 0 200 400 800 1200 Feet 0 50 100 200 300 Meters Map Scale: 1:4,120 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. SITE SITE SITE MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:15,800. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Hamilton County, Indiana Survey Area Data: Version 21, Jun 4, 2020 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Aug 1, 2018—Sep 30, 2018 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 1/7/2021 Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI UbaA Urban land-Brookston complex, 0 to 2 percent slopes 2.7 4.5% UcfA Urban land-Crosby silt loam complex, fine-loamy subsoil, 0 to 2 percent slopes 6.7 11.1% YbvA Brookston silty clay loam- Urban land complex, 0 to 2 percent slopes 14.0 22.9% YclA Crosby silt loam, fine-loamy subsoil-Urban land complex, 0 to 2 percent slopes 27.0 44.4% YmsA Miami silt loam-Urban land complex, 0 to 2 percent slopes 5.5 9.1% YmsB2 Miami silt loam-Urban land complex, 2 to 6 percent slopes, eroded 4.0 6.6% YshAH Shoals silt loam-Urban land complex, 0 to 2 percent slopes, frequently flooded, brief duration 0.9 1.5% Totals for Area of Interest 60.9 100.0% Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 1/7/2021 Page 3 of 3 Carmel Clay Schools – Carmel Clay Middle School Proposed Site Improvements January 13, 2021 TLF, Inc. Project No. 2020-367 Appendix B Existing Drainage Conditions GUILFORD ROADGUILFORD ROADCONSULTANTPROJECT NUMBER: 220128.00/2020-367CARMEL CLAY SCHOOLSPROJECT ISSUE DATE: 01.13.2021DRAWN BY: ARSREV.NO.DESCRIPTIONDATECONSTRUCTION DOCUMENTSWWW.FHAI.COMARCHITECT317-848-0966350 E NEW YORK ST# 300, INDIANAPOLIS, IN 46204COPYRIGHT 2021 BY FANNING/HOWEY ASSOCIATES, INC.CARMEL MIDDLESCHOOL SITE300 S Guilford RdCARMEL, IN 46032IMPROVEMENTSPROJECT : 220128.00PROJECT MANAGER: BNHNORTH309003060EXISTING DRAINAGE CONDITIONSEAST PARKING LOT PROJECT AREAB1STORM LINE CEX BASIN 301A = 1.42c = 0.85EX BASIN EXA = 0.32c = 0.25EX BASIN 300A = 0.95c = 0.35 CONSULTANTPROJECT NUMBER: 220128.00/2020-367CARMEL CLAY SCHOOLSPROJECT ISSUE DATE: 01.13.2021DRAWN BY: ARSREV.NO.DESCRIPTIONDATECONSTRUCTION DOCUMENTSWWW.FHAI.COMARCHITECT317-848-0966350 E NEW YORK ST# 300, INDIANAPOLIS, IN 46204COPYRIGHT 2021 BY FANNING/HOWEY ASSOCIATES, INC.CARMEL MIDDLESCHOOL SITE300 S Guilford RdCARMEL, IN 46032IMPROVEMENTSPROJECT : 220128.00PROJECT MANAGER: BNHB2EXISTING DRAINAGE CONDITIONSWEST SIDEWALK PROJECT AREANORTH4012004080STORM LINE AEX BASIN 107A = 1.45c = 0.69EX BASIN 106A = 0.60c = 0.25EX BASIN Ex.12in.A = 1.14c = 0.80EX BASIN Ex. 15in.A = 2.35c = 0.35 GRAND BLVDCONSULTANTPROJECT NUMBER: 220128.00/2020-367CARMEL CLAY SCHOOLSPROJECT ISSUE DATE: 01.13.2021DRAWN BY: ARSREV.NO.DESCRIPTIONDATECONSTRUCTION DOCUMENTSWWW.FHAI.COMARCHITECT317-848-0966350 E NEW YORK ST# 300, INDIANAPOLIS, IN 46204COPYRIGHT 2021 BY FANNING/HOWEY ASSOCIATES, INC.CARMEL MIDDLESCHOOL SITE300 S Guilford RdCARMEL, IN 46032IMPROVEMENTSPROJECT : 220128.00PROJECT MANAGER: BNHB3EXISTING DRAINAGE CONDITIONSSOUTH ENTRY/EXIT PROJECT AREANORTH4012004080STORM LINE CEX BASIN 315A = 6.23c = 0.50 Carmel MiddleSchool100101102103104105106107108109Ex 15inEx 12in110Ex. MH111112113114 Carmel MiddleSchool100101102103104105106107108109Ex 15inEx 12in110Ex. MH111112113114 Ex.300301Carmel MiddleSchool304305306302303307308309310311312313314315316317 Carmel Clay Schools – Carmel Clay Middle School Proposed Site Improvements January 13, 2021 TLF, Inc. Project No. 2020-367 Appendix C Proposed Storm Sewer Calculations Description:Carmel Middle School Reviewing Entity:City of Carmel Job #:2020-367 Date:01/13/21 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 RAINFALL INTENSITIES & DEPTHS Frequency Rainfall Depth (in) Frequency Rainfall Intensity (in/hr) City of Carmel Data Job Information GUILFORD ROADGUILFORD ROADCONSULTANTPROJECT NUMBER: 220128.00/2020-367CARMEL CLAY SCHOOLSPROJECT ISSUE DATE: 01.13.2021DRAWN BY: ARSREV.NO.DESCRIPTIONDATECONSTRUCTION DOCUMENTSWWW.FHAI.COMARCHITECT317-848-0966350 E NEW YORK ST# 300, INDIANAPOLIS, IN 46204COPYRIGHT 2021 BY FANNING/HOWEY ASSOCIATES, INC.CARMEL MIDDLESCHOOL SITE300 S Guilford RdCARMEL, IN 46032IMPROVEMENTSPROJECT : 220128.00PROJECT MANAGER: BNHNORTH4012004080INLET AREAEAST PARKING LOT PROJECT AREAC1TENNIS COURTSSTORM LINE C BASIN 301A = 1.42c = 0.85 BASIN EXA = 0.32c = 0.44 BASIN 300A = 0.95c = 0.39 CONSULTANTPROJECT NUMBER: 220128.00/2020-367CARMEL CLAY SCHOOLSPROJECT ISSUE DATE: 01.13.2021DRAWN BY: ARSREV.NO.DESCRIPTIONDATECONSTRUCTION DOCUMENTSWWW.FHAI.COMARCHITECT317-848-0966350 E NEW YORK ST# 300, INDIANAPOLIS, IN 46204COPYRIGHT 2021 BY FANNING/HOWEY ASSOCIATES, INC.CARMEL MIDDLESCHOOL SITE300 S Guilford RdCARMEL, IN 46032IMPROVEMENTSPROJECT : 220128.00PROJECT MANAGER: BNHC2INLET AREAWEST SIDEWALK PROJECT AREANORTH4012004080STORM LINE AEX BASIN 107A = 1.45c = 0.69EX BASIN 106A = 0.60c = 0.28EX BASIN Ex.12in.A = 1.14c = 0.80EX BASIN Ex. 15in.A = 2.35c = 0.36 GRAND BLVDCONSULTANTPROJECT NUMBER: 220128.00/2020-367CARMEL CLAY SCHOOLSPROJECT ISSUE DATE: 01.13.2021DRAWN BY: ARSREV.NO.DESCRIPTIONDATECONSTRUCTION DOCUMENTSWWW.FHAI.COMARCHITECT317-848-0966350 E NEW YORK ST# 300, INDIANAPOLIS, IN 46204COPYRIGHT 2021 BY FANNING/HOWEY ASSOCIATES, INC.CARMEL MIDDLESCHOOL SITE300 S Guilford RdCARMEL, IN 46032IMPROVEMENTSPROJECT : 220128.00PROJECT MANAGER: BNHC3INLET AREASOUTH ENTRANCE PROJECT AREANORTH4012004080STORM LINE CEX BASIN 315A = 6.23c = 0.52 Carmel Middle School1/13/2021Runoff CoefficientRunoff Curve NumberRoof0.9098Grass0.25-Pavement0.8598Roof Area Pervious Area Pavement Area Total AreaWeighted Runoff Coefficient(acres)(acres)(acres)(acres)CEx Line A Ex. 12in. 0.77 0.16 0.21 1.14 0.80Ex Line A Ex. 15in. 0.00 1.95 0.40 2.35 0.35Ex Line A Ex. 107 0.99 0.46 0.00 1.45 0.69 *Existing Model-Initial had c = 0.25Ex Line A Ex. 106 0.00 0.60 0.00 0.60 0.25Prop Line A Ex. 12in. 0.77 0.15 0.22 1.14 0.80 *Added 341 sft (0.008 acres) of Pavement Area (West Sidewalk)Prop Line A Ex. 15in. 0.00 1.93 0.42 2.35 0.36 *Added 778 sft (0.018 acres) of Pavement Area (West Sidewalk)Prop Line A Ex. 107 0.99 0.46 0.002 1.45 0.69 *Added 107 sft (0.002 acres) of Pavement Area (West Sidewalk)Prop Line A Ex. 106 0.00 0.57 0.03 0.60 0.28 *Added 1159 sft (0.027 acres) of Pavement Area (West Sidewalk)Ex Line C Ex. 315 0.00 3.63 2.60 6.23 0.50Prop Line C Ex. 315 0.00 3.41 2.82 6.23 0.52 *Added 0.22 acres of Pavement Area (South Drive and Sidewalks)Ex Line C Ex. 300 0.00 0.79 0.16 0.95 0.35Ex Line C Ex. 0.00 0.32 0.00 0.32 0.25Prop Line C Ex. 300 0.00 0.73 0.22 0.95 0.39 *Added 2683 sft (0.06 acres) of Pavement Area (East Sidewalk)Prop Line C Ex. 0.00 0.22 0.10 0.32 0.44 *Added 4495 sft (0.10 acres) of Pavement Area (East Sidewalk)Runoff Coefficient and Runoff Curve Number CalculationJob InformationCity of Carmel2020-367Basin StructureDescription:Entity:Job #:Date: Carmel MiddleSchool100101102103104105106107108109Ex 15inEx 12in110Ex. MH111112113114Basin 107DA = 1.45 acresExisting c = 0.69 (corrected)Proposed c= 0.69Basin 106DA = 0.60 acresExisting c = 0.25Proposed c= 0.28Basin Ex. 12in.DA = 1.14 acresExisting c = 0.80Proposed c= 0.80Basin Ex. 15in.DA = 2.35 acresExisting c = 0.35Proposed c= 0.36Approximate ProjectLimits of West Sidewalk Existing: 5.38 cfs (1.2%increase)Existing: 10.95 cfs(0.45% increase)Existing: 27.68 cfs(0.43% increase)Prop = Existing Basin 315DA = 6.23 acresExisting c = 0.5Proposed c= 0.52Ex.300301Carmel MiddleSchool304305306302303307308309310311312313314315316317Basin 300DA = 0.95 acresExisting c = 0.35Proposed c= 0.39Basin Ex.DA = 0.32 acresExisting c = 0.25Proposed c= 0.44Approximate ProjectLimits of SouthEntrance Existing: 22.96 cfs(2.7% increase)Existing: 22.85 cfs(2.0% increase)Existing: 8.89 cfs(3.9% increase) Carmel Clay Schools – Carmel Clay Middle School Proposed Site Improvements January 13, 2021 TLF, Inc. Project No. 2020-367 Appendix D Proposed Drainage Conditions 843843842841CONSULTANTPROJECT NUMBER: 220128.00CARMEL CLAY SCHOOLSPROJECT ISSUE DATE: 01.13.2021DRAWN BY: EBREV.NO.DESCRIPTIONDATECONSTRUCTION DOCUMENTSWWW.FHAI.COMARCHITECT317-848-0966350 E NEW YORK ST# 300, INDIANAPOLIS, IN 46204COPYRIGHT 2021 BY FANNING/HOWEY ASSOCIATES, INC.CARMEL MIDDLESCHOOL EAST300 S Guilford RdCARMEL, IN 46032PARKING LOTRECONFIGURATIONPROJECT : 220128.00PROJECT MANAGER: CTB2EXISTING DRAINAGE CONDITIONSWEST SIDEWALK PROJECT AREANORTH309003060 GRAND BLVDSTR. 303STR. 302STR. 301STR. 306847846846845846846CONSULTANTPROJECT NUMBER: 220128.00CARMEL CLAY SCHOOLSPROJECT ISSUE DATE: 01.13.2021DRAWN BY: EBREV.NO.DESCRIPTIONDATECONSTRUCTION DOCUMENTSWWW.FHAI.COMARCHITECT317-848-0966350 E NEW YORK ST# 300, INDIANAPOLIS, IN 46204COPYRIGHT 2021 BY FANNING/HOWEY ASSOCIATES, INC.CARMEL MIDDLESCHOOL EAST300 S Guilford RdCARMEL, IN 46032PARKING LOTRECONFIGURATIONPROJECT : 220128.00PROJECT MANAGER: CTB3EXISTING DRAINAGE CONDITIONSSOUTH ENTRY/EXIT PROJECT AREANORTH309003060 GUILFORD ROADGUILFORD ROAD840838 839839839 83883883883783 9839 83 9 8398 3 9 83983984 0 840 840840 CONSULTANTPROJECT NUMBER: 220128.00CARMEL CLAY SCHOOLSPROJECT ISSUE DATE: 01.13.2021DRAWN BY: EBREV.NO.DESCRIPTIONDATECONSTRUCTION DOCUMENTSWWW.FHAI.COMARCHITECT317-848-0966350 E NEW YORK ST# 300, INDIANAPOLIS, IN 46204COPYRIGHT 2021 BY FANNING/HOWEY ASSOCIATES, INC.CARMEL MIDDLESCHOOL EAST300 S Guilford RdCARMEL, IN 46032PARKING LOTRECONFIGURATIONPROJECT : 220128.00PROJECT MANAGER: CTNORTH309003060EXISTING DRAINAGE CONDITIONSNORTH ENTRY PROJECT AREAB1 Carmel Clay Schools – Carmel Clay Middle School Proposed Site Improvements January 13, 2021 TLF, Inc. Project No. 2020-367 Appendix E Proposed Water Quality Calculations WQ Water Quality Routing Diagram for 2020-367_Water Quality Model_2021-01-11 Prepared by TLF, Inc. HydroCAD® 10.10-5a s/n 10212 © 2020 HydroCAD Software Solutions LLC Subcat Reach Pond Link 2020-367_Water Quality Model_2021-01-11 Prepared by TLF, Inc. Page 2HydroCAD® 10.10-5a s/n 10212 © 2020 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) 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 Type II 24-hr WQ 1in - 24HR Rainfall=1.00"2020-367_Water Quality Model_2021-01-11 Prepared by TLF, Inc. Page 3HydroCAD® 10.10-5a s/n 10212 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment WQ: Water Quality [49] Hint: Tc<2dt may require smaller dt Runoff = 0.49 cfs @ 11.95 hrs, Volume= 0.022 af, Depth> 0.66" 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 * 0.400 97 0.400 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment WQ: Water Quality Runoff Hydrograph Time (hours) 201918171615141312111098765Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr WQ 1in - 24HR Rainfall=1.00" Runoff Area=0.400 ac Runoff Volume=0.022 af Runoff Depth>0.66" Tc=5.0 min CN=97 0.49 cfs 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 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 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 Description:Carmel Middle School Reviewing Entity: Job #: Date:01/13/21 CNwq= PARAMETERS P =1 (in.) Pervious Area 0.12 Impervious Area 0.28 South Impervious Surface = 0.22 acres, West Impervious Surface = 0.05 acre, East Impervious Surface = 0.01 acre Area 0.40 South Disturbed Area = 0.34 acres, West Disturbed Area = 0.05 acre, East Disturbed Area = 0.01 acre I = 70%(%) Rv = 0.68 Qa=0.68 (in.) CALCULATED CNwq CNwq =97 1000 [10+5P+10Qa-10(Qa2+1.25Qa(P))1/2] PROPOSED STORMWATER SYSTEM WATER QUALITY CURVE NUMBER Job Information City of Carmel 2020-367 Carmel Clay Schools – Carmel Clay Middle School Proposed Site Improvements January 13, 2021 TLF, Inc. Project No. 2020-367 Appendix F Previous Drainage Reports THIS MODEL WASREVISED IN 2004.SEE INITIAL EXISTINGMODEL ANDCORRECTED EXISTINGMODEL INCLUDED IN2021 REPORT. THIS MODEL WASREVISED IN 2004.SEE INITIAL EXISTINGMODEL ANDCORRECTED EXISTINGMODEL INCLUDED IN2021 REPORT. THIS MODEL WASREVISED IN 2004.SEE INITIAL EXISTINGMODEL ANDCORRECTED EXISTINGMODEL INCLUDED IN2021 REPORT. THIS MODEL DOES NOTINCLUDE EXISTINGSTORM SEWER SOUTHOF TENNIS COURTS.SEE INITIAL EXISTINGAND REVISED EXISTINGMODELS INCLUDED IN2021 REPORT. THIS MODEL DOES NOTINCLUDE EXISTINGSTORM SEWER SOUTHOF TENNIS COURTS.SEE INITIAL EXISTINGAND REVISED EXISTINGMODELS INCLUDED IN2021 REPORT. THIS MODEL DOES NOTINCLUDE EXISTINGSTORM SEWER SOUTHOF TENNIS COURTS.SEE INITIAL EXISTINGMODEL INCLUDED IN2021 REPORT.