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Home My WebLink AboutDrainage Reports Project: HIGHER GROUND EDUCATION – CARMEL #2 690 Pro-Med Lane Carmel, Indiana 46033 Prepared For: Murphy Real Estate Services 12728 Old Stone Drive Indianapolis, Indiana 46236 Prepared By: CIVIL & ENVIRONMENTAL CONSULTANTS, INC. Indianapolis, Indiana Prepared By: Stephanie Dorn, E.I. CEC Project 334-649 DECEMBER 2023 DRAINAGE REPORT -i- Higher Ground Education - Carmel December 2023 TABLE OF CONTENTS 1.0 REPORT OVERVIEW.....................................................................................................1 2.0 PROJECT BACKGROUND ............................................................................................1 2.1 EXISTING CONDITIONS ...................................................................................1 2.1.1 FEMA Map..................................................................................................1 2.1.2 Watershed Description.................................................................................1 2.1.3 Soils Map.....................................................................................................1 3.0 PROPOSED CONDITIONS.............................................................................................1 3.1 STORMWATER DESIGN ...................................................................................1 3.1.1 Storm Sewer Sizing......................................................................................2 3.1.2 Water Quality Treatment.............................................................................2 4.0 CONCLUSION ..................................................................................................................3 5.0 REFERENCES.........................................................................................................................3 APPENDICES Appendix A – FEMA Map Appendix B – Soils Map Appendix C – Existing & Proposed Drainage Maps Appendix D – Storm Sewer Sizing Calculations 1.0 REPORT OVERVIEW This report addresses the storm water requirements for the proposed Higher Ground Education Center project located at 690 Pro-Med Lane. The overall project area is ±1.28 acres. The project consists of the construction of a new playground area and associated site improvements (stormwater network and minimal hardscape improvements). The playground will extend into the existing lawn south of the building and replace the existing concrete pavilion. The playground area will sheet flow to proposed inlets that will tie into the existing stormwater network. The stormwater network ultimately drains to Cool Creek. The calculations computed in this report consider the 1.28 acres draining to the stormwater network; however, the total disturbed area will total 0.12 acres with the existing building and parking lot remaining in place. 2.0 PROJECT BACKGROUND 2.1 EXISTING CONDITIONS The project site is the lawn located south of the existing daycare building in Carmel, IN, located south of N Meridian St. The lawn and existing pavilion sheet flow to inlets located throughout the site. The existing stormwater system then routes south-east towards Little Cool Creek. Site Drainage will ultimately drain to Cool Creek. An existing 15” HDPE Pipe collects the runoff from the site and routes south-east. The existing drainage map Figure C-1 in Appendix C highlights the pre-developed drainage patterns. The project area of interest delineates a 1.28- acre area of existing lawn, building, and hardscape. 2.1.1 FEMA Map The project site is located within FEMA Community Panel #18057C0207G (dated 11/19/2014), which indicates the Higher Ground Education Center Site is located within the Flood Designation Zone ‘X’ and Zone ‘AE’. Please note that the proposed improvements have been setback 25’ from the north boundary of Flood Zone ‘AE’; therefore, no flood permitting will be required. The FEMA Map is included in Appendix A. 2.1.2 Watershed Description The 12-digit Hydrologic Unit Code (HUC) for this watershed is #0512020110. The site drains to the existing storm sewer and eventually to the Crooked Creek-White River watershed. 2.1.3 Soils Map The approximate limits of each soil type are depicted in the Soils Map provided in Appendix B. 3.0 PROPOSED CONDITIONS 3.1 STORMWATER DESIGN The proposed project will disturb approximately 0.12 acres to construct a playground area with associated improvements to the existing site. The proposed playground area will replace the existing lawn and pavilion. The playground will sheet flow to inlets that are routed to the existing stormwater network. See Figure C-2 for site map in Appendix C. The proposed Higher Ground Education project site will have a Tc of 8.2 minutes. The increase in impervious area is 0.09 acres. Based on the disturbed area, this project will require a stormwater detention and water quality analysis as stated in the City of Carmel Stormwater Technical Standards Manual. The results of the proposed project site compared to the existing project site has a negligible increase in runoff rates. Please see calculations in Appendix D. Proposed Site The Tc of the proposed site is calculated to be 8.2 minutes can be found in Appendix D. The overall drainage area to consider to the stormwater network (Basin A) includes 0.58 acres of pervious surface and 0.58 acres of impervious surface. The rational method was used to determine stormwater runoff rates and is included in Appendix D. Table 1 Discharge Rates Proposed Peak Runoff Rate (cfs) Proposed Site Area: 1.28 acres 2-Year (cfs) 10-Year (cfs) 100-Year (cfs) Existing Discharge Rates 2.58 3.41 5.08 Discharge from Proposed Site 2.67 3.53 5.27 3.1.1 Storm Sewer Sizing Three additional inlets are proposed throughout the playground area. These inlets will tie into the existing storm sewer network. Inlet overtopping is not anticipated. Calculations can be found in Appendix D. 3.1.2 Water Quality Treatment The Hamilton County Stormwater Management Technical Standards Manual does not require water quality treatment for a redevelopment site that disturbs under 0.25 acres. The overall disturbed area is 0.12 acres and no water quality treatment is proposed. 4.0 CONCLUSION The Higher Ground Education Center will manage site stormwater in accordance with the Hamilton County Stormwater Management Technical Standards Manual. With the proper construction of the stormwater pipes, no adverse impacts are expected for upstream or downstream property owners. 5.0 REFERENCES 1. Web Soil Survey 2. FEMA Flood Insurance Rate Maps, FEMA website 3. City of Carmel Stormwater Management Technical Standards Manual. APPENDIX A FEMA MAP National Flood Hazard Layer FIRMette 0 500 1,000 1,500 2,000250 Feet Ü SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT SPECIAL FLOOD HAZARD AREAS Without Base Flood Elevation (BFE) Zone A, V, A99 With BFE or DepthZone AE, AO, AH, VE, AR Regulatory Floodway 0.2% Annual Chance Flood Hazard, Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mileZone X Future Conditions 1% Annual Chance Flood HazardZone X Area with Reduced Flood Risk due to Levee. See Notes.Zone X Area with Flood Risk due to LeveeZone D NO SCREEN Area of Minimal Flood Hazard Zone X Area of Undetermined Flood HazardZone D Channel, Culvert, or Storm Sewer Levee, Dike, or Floodwall Cross Sections with 1% Annual Chance 17.5 Water Surface Elevation Coastal Transect Coastal Transect Baseline Profile Baseline Hydrographic Feature Base Flood Elevation Line (BFE) Effective LOMRs Limit of Study Jurisdiction Boundary Digital Data Available No Digital Data Available Unmapped This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below. The basemap shown complies with FEMA's basemap accuracy standards The flood hazard information is derived directly from the authoritative NFHL web services provided by FEMA. This map was exported on 9/7/2023 at 11:37 AM and does not reflect changes or amendments subsequent to this date and time. The NFHL and effective information may change or become superseded by new data over time. This map image is void if the one or more of the following map elements do not appear: basemap imagery, flood zone labels, legend, scale bar, map creation date, community identifiers, FIRM panel number, and FIRM effective date. Map images for unmapped and unmodernized areas cannot be used for regulatory purposes. Legend OTHER AREAS OF FLOOD HAZARD OTHER AREAS GENERAL STRUCTURES OTHER FEATURES MAP PANELS 8 B 20.2 The pin displayed on the map is an approximate point selected by the user and does not represent an authoritative property location. 1:6,000 86°8'41"W 39°59'15"N 86°8'3"W 39°58'47"N Basemap Imagery Source: USGS National Map 2023 APPENDIX B SOILS MAP Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 12/19/2023 Page 1 of 344260204426050442608044261104426140442617044262004426230442626044260504426080442611044261404426170442620044262304426260573480573510573540573570573600573630 573480 573510 573540 573570 573600 573630 39° 58' 59'' N 86° 8' 22'' W39° 58' 59'' N86° 8' 14'' W39° 58' 52'' N 86° 8' 22'' W39° 58' 52'' N 86° 8' 14'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 16N WGS84 0 50 100 200 300 Feet 0 15 30 60 90 Meters Map Scale: 1:1,170 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. 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 24, Sep 1, 2023 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jun 15, 2022—Jun 21, 2022 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 12/19/2023 Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI YhnF Hennepin loam-Urban land complex, 18 to 50 percent slopes 0.3 14.1% YmsC2 Miami silt loam-Urban land complex, 6 to 12 percent slopes, eroded 0.0 1.5% YshAH Shoals silt loam-Urban land complex, 0 to 2 percent slopes, frequently flooded, brief duration 1.5 84.4% Totals for Area of Interest 1.8 100.0% Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 12/19/2023 Page 3 of 3 APPENDIX C EXISTING & PROPOSED DRAINAGE MAPS ABC100 LF AT6.7%SLOPE240 LF AT2.7%SLOPEDATE:DWG SCALE:DRAWN BY:CHECKED BY:APPROVED BY:PROJECT NO:FIGURE NO.:EXISTING CONDITIONS DRAINAGE MAP334-6491"=60'DECEMBER 2023SRDKPBDRAFTC-1MURPHY REAL ESTATE SERVICESHIGHER GROUND EDUCATION590 PRO-MED LANECARMEL, INDIANA 46033REFERENCE530 E. Ohio Street, Suite G - Indianapolis, IN 46204317-655-7777 · 877-746-0749 www.cecinc.comNORTH UP UP ABC100 LF AT6.7%SLOPE240 LF AT2.7%SLOPEDATE:DWG SCALE:DRAWN BY:CHECKED BY:APPROVED BY:PROJECT NO:FIGURE NO.:PROPOSED CONDITIONS DRAINAGE MAP334-6491"=60'DECEMBER 2023SRDKPBDRAFTC-2MURPHY REAL ESTATE SERVICESHIGHER GROUND EDUCATION590 PRO-MED LANECARMEL, INDIANA 46033REFERENCE530 E. Ohio Street, Suite G - Indianapolis, IN 46204317-655-7777 · 877-746-0749 www.cecinc.comNORTH Civil & Environmental Consultants, Inc. By: SRD Project Name: Higher Ground - Carmel #2 Date: 12/2023 CEC Project No.: 334649 Checked By: Description: Composite C Calculations Date: Runoff Coefficient 0.90 0.85 0.60 0.20 BASINS Pre -A Roof Pavement Turf Lawn Total Total Composite (ft^2) (ft^2) (ft^2) (ft^2) (ft^2) (Acres) "C" 6,052 19,214 0 25,264 50,530 1.16 0.53 Pre-B Roof Pavement Turf Lawn Total Total Composite (ft^2) (ft^2) (ft^2) (ft^2) (ft^2) (Acres) "C" 0 0 0 2,614 2,614 0.06 0.20 Pre-C Roof Pavement Turf Lawn Total Total Composite (ft^2) (ft^2) (ft^2) (ft^2) (ft^2) (Acres) "C" 0 436 0 2,178 2,614 0.06 0.31 Post -A Roof Pavement Turf Lawn Total Total Composite (ft^2) (ft^2) (ft^2) (ft^2) (ft^2) (Acres) "C" 6,052 20,956 0 23,522 50,530 1.16 0.55 Post-B Roof Pavement Turf Lawn Total Total Composite (ft^2) (ft^2) (ft^2) (ft^2) (ft^2) (Acres) "C" 0 0 0 2,614 2,614 0.06 0.20 Post-C Roof Pavement Turf Lawn Total Total Composite (ft^2) (ft^2) (ft^2) (ft^2) (ft^2) (Acres) "C" 0 436 0 2,178 2,614 0.06 0.31 Roof Surfaces= Pavement= Turf = Lawn= 53146 58370 2.56 1.22 1.34 APPENDIX D STORM SEWER SIZING CALCULATIONS UP UP UP UP DATE:DWG SCALE:DRAWN BY:CHECKED BY:APPROVED BY:PROJECT NO:FIGURE NO.:PROPOSED INLET DRAINAGE MAP334-6491"=60'DECEMBER 2023SRDKPBDRAFTC-3MURPHY REAL ESTATE SERVICESHIGHER GROUND EDUCATION590 PRO-MED LANECARMEL, INDIANA 46033REFERENCE530 E. Ohio Street, Suite G - Indianapolis, IN 46204317-655-7777 · 877-746-0749 www.cecinc.comNORTH CEC Project No.: 334-649 Project Name: Higher Ground - Carmel #2 By: KPB Description:Proposed Conditions - Storm Sewer Sizing Worksheet Date 12/19/23 Design Storm Frequency = 10-year Manning's n = 0.012 Increment Total To Upper End In Section Flowing Full Design Flow U/S Structure D/S Structure U/S Structure D/S Structure U/S Structure D/S Structure U/S D/S (ft) (acres) (acres) Increment Total (min) (min) (in/hr) (cfs) (ft) % (cfs) (ft/s) (ft/s) (ft) (ft) (ft) (ft) (ft) (ft) 103 102 64 0.68 0.68 0.62 0.42 0.49 7.80 0.25 5.62 2.73 1.25 0.57 5.30 4.32 - 821.70 822.80 819.30 818.93 0.96 2.43 102 101 40 0.07 0.75 0.49 0.03 0.52 8.05 0.16 5.57 2.90 1.25 0.57 5.30 4.32 - 822.80 821.60 818.93 818.70 2.43 1.46 101 100 142 0.05 0.80 0.33 0.02 0.54 8.20 0.84 5.54 2.97 1.25 0.25 3.49 2.84 - 821.60 821.10 818.05 817.70 2.11 1.96 N2 N1 35 0.13 0.13 0.30 0.04 0.04 5.00 0.23 6.12 0.24 0.50 0.70 0.51 2.60 - 821.70 821.95 819.58 819.33 1.50 1.99 N1 102 57 0.04 0.17 0.36 0.01 0.05 5.23 0.37 6.08 0.32 0.50 0.70 0.51 2.60 - 821.95 822.80 819.33 818.93 1.99 3.24 N3 102 26 0.02 0.02 0.53 0.01 0.01 5.00 0.16 6.12 0.06 0.50 0.70 0.51 2.60 - 823.90 822.80 819.11 818.93 4.16 3.24 NOTE: STRUCTURE #102 IS A NEW DOGHOUSE OPEN GRATE MANHOLE TO BE PLACED OVER AN EXISTING 15" HDPE STORM RUN. STRUCTURES 100, 101, AND 103 ARE EXISTING. PIPE DIAMETER SLOPE OF SEWER FULL CAPACITY VELOCITY RIM ELEVATION INVERT ELEVATION COVER STRUCTURE LENGTH DRAINAGE AREA "A" RUNOFF COEFFICIENT "C" "A" x "C" FLOW TIME RAINFALL INTENSITY TOTAL RUNOFF Structure Turn Outfall Loss Factor Loss Factor Loss Factor Minor Losses Grate 0.25 90° Bend 0.70 Pond 0.90 ( Structure Loss + Turn Loss + Outfall Loss ) x V2/2g = Minor Losses Solid 0.00 60° Bend 0.55 Free Flow 0.50 - 45° Bend 0.47 Tail Water 0.10 30° Bend 0.30 - 0.00 Design Storm Frequency = 10-year 15° Bend 0.18 Manning's n = 0.012 0° Bend 0.00 D/S HGL Slope (Design) Design Velocity, Sh Structure Type Structure Loss Factor Turn Factor Turn Loss Factor Outfall Type Outfall Loss Factor Minor Losses Friction Loss, Hf Total of Losses Tailwater 0.8 * D U/S HGL U/S D/S (ft) % (ft/s) - - - - - - (ft) (ft) (ft) (ft) (ft) (ft) (ft) 103 102 819.93 0.15 2.22 Grate 0.25 0° Bend 0.00 - 0.00 0.02 0.10 0.12 820.05 820.30 820.30 0.25 102 101 819.05 0.17 2.36 Grate 0.25 0° Bend 0.00 - 0.00 0.02 0.07 0.09 819.14 819.93 819.93 0.25 101 100 817.70 0.18 2.42 Grate 0.25 15° Bend 0.18 - 0.00 0.04 0.26 0.29 817.99 819.05 819.05 0.25 N2 N1 819.73 0.15 1.22 Grate 0.25 90° Bend 0.70 - 0.00 0.02 0.05 0.08 819.81 819.98 819.98 0.10 N1 102 818.93 0.28 1.65 Grate 0.25 0° Bend 0.00 - 0.00 0.01 0.16 0.17 819.11 819.73 819.73 0.10 N3 102 818.93 0.01 0.33 Grate 0.25 0° Bend 0.00 - 0.00 0.00 0.00 0.00 818.93 819.51 819.51 0.10 Freeboard to U/S CrownSTRUCTURE Hydraulic Grade Line (HGL) Hydraulic Losses HGL with Losses Civil & Environmental Consultants, Inc. By: SRD Project Name: Higher Ground - Carmel #2 Date: 12/2023 CEC Project No.: 334649 Checked By: Description: Composite C Calculations - Storm Basins Date: Runoff Coefficient 0.90 0.85 0.60 0.20 BASINS STR 103 Roof Pavement Turf Lawn Total Total Composite (ft^2) (ft^2) (ft^2) (ft^2) (ft^2) (Acres) "C" 3,026 15,705 0 10,890 29,621 0.68 0.62 STR N2 Roof Pavement Turf Lawn Total Total Composite (ft^2) (ft^2) (ft^2) (ft^2) (ft^2) (Acres) "C" 0 871 0 4,792 5,663 0.13 0.30 STR N1 Roof Pavement Turf Lawn Total Total Composite (ft^2) (ft^2) (ft^2) (ft^2) (ft^2) (Acres) "C" 0 436 0 1,306 1,742 0.04 0.36 STR 101 Roof Pavement Turf Lawn Total Total Composite (ft^2) (ft^2) (ft^2) (ft^2) (ft^2) (Acres) "C" 0 436 0 1,742 2,178 0.05 0.33 STR 102 Roof Pavement Turf Lawn Total Total Composite (ft^2) (ft^2) (ft^2) (ft^2) (ft^2) (Acres) "C" 454 853 0 1,742 3,049 0.07 0.49 STR N3 Roof Pavement Turf Lawn Total Total Composite (ft^2) (ft^2) (ft^2) (ft^2) (ft^2) (Acres) "C" 0 436 0 436 872 0.02 0.53 Roof Surfaces= Pavement= Turf = Lawn= 22217 20908 0.99 0.51 0.48