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Home My WebLink AboutDrainage Memo Woolpert, Inc. 333 North Alabama Street, Suite 200 Indianapolis, IN 46204 317.299.7500 Drainage Memo To: City of Carmel, Indiana From: Jon Sheidler Date: 04/14/21 Subject: Bank of America – Carmel, IN The proposed project is located within The Bridges PUD at the southwest corner of Illinois Street and Zotec Drive in Carmel, Indiana, and more specifically in the existing parking lot of The Bridges Retail Development, just south of the gas station. Please see the attached Vicinity Map for reference. The proposed development consists of a 4,429 square foot commercial building, associated parking, storm sewer improvements, and other associated utilities. The proposed development is located within The Bridges Retail Development that was completed in 2015. The overall site has been master-planned and includes detention and water quality treatment for the proposed project site. Please see Appendix C of this Drainage Memo for the Drainage Computations Summary for The Bridges Retail Development Supermarket and Gas Station, Revision 2 on February 17, 2015, hereafter referred to as the Master Drainage Report. The project site is located within the 18.12 acre basin shown in Appendix C of the Master Drainage Report. As mentioned in the Master Drainage Report, the Future Commercial Basin was assumed to be 90% impervious for the purpose of calculating future detention and water quality capacity. The proposed development is only 86% impervious and therefore conforms with the Master Plan and no further detention analysis is required. The proposed site lies within a Zone X according to FIRM Map 18057C028G from the FEMA database, eff. November 19, 2014. April 14, 2021 Page 2 Woolpert, Inc. 333 North Alabama Street, Suite 200 Indianapolis, IN 46204 317.299.7500 As a part of the proposed development, additional storm structures and storm sewer will be needed. The proposed storm sewer system will connect to existing STR #153 from The Bridges Retail Development Plans. Additionally, a portion of the proposed development will drain to STR #142. However, the weighted c value and overall drainage to STR #142 has been reduced in the proposed condition. The proposed storm sewer has been designed to convey runoff from the 10-year storm event completely within the pipes, and the 100-year event within the castings. Please refer to Appendix B of this Drainage Memo for the proposed storm sewer calculations. An emergency flood route assuming all inlets are clogged has been provided for the development. Please see sheet C300 (Grading Plan) of the Bank of America Development Plans for the flood routing on the subject parcel, and refer to C400 (Overall Drainage Plan) from The Bridges Retail Development Plans for the continuation of the routing south of the supermarket to the detention pond. C400 from The Bridges Retail Development has been included within Appendix C of the Drainage Memo for reference. Water quality has already been provided as a part of The Bridges Retail Development Master Plan. An AS-13 Aquaswirl unit is located downstream of the site to treat the first flush from the overall basin, while the master planned detention pond provides secondary water quality treatment. Please refer to the BMP Location Map located in Appendix E of the Master Drainage Report for the location of the existing post-construction BMP’s. The drainage from the proposed site has been designed to meet the intent of the City of Carmel Stormwater Technical Standards and conforms to the previously approved Master Plan Drainage Report. Therefore, no adverse impacts are anticipated as a result of this development. April 14, 2021 Page 3 Woolpert, Inc. 333 North Alabama Street, Suite 200 Indianapolis, IN 46204 317.299.7500 Appendices: Appendix A: · Vicinity Map · FEMA FIRMette · Soils Report Appendix B: · Storm Sewer Calculations Appendix C: · Drainage Computations Summary for The Bridges Retail Development Supermarket and Gas Station, Revision 2 on February 17, 2015 · C400 – Overall Drainage Plan from The Bridges Retail Development Woolpert, Inc. 333 North Alabama Street, Suite 200 Indianapolis, IN 46204 317.299.7500 Appendix A Project Site 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 2/17/2021 at 3:34 PM 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°10'6"W 39°57'23"N 86°9'28"W 39°56'55"N Basemap: USGS National Map: Orthoimagery: Data refreshed October, 2020 Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 3/26/2021 Page 1 of 344228804422890442290044229104422920442293044229404422950442296044229704422980442288044228904422900442291044229204422930442294044229504422960442297044229804422990571400571410571420571430571440571450571460571470571480571490571500571510571520571530571540571550571560571570 571410 571420 571430 571440 571450 571460 571470 571480 571490 571500 571510 571520 571530 571540 571550 571560 571570 39° 57' 14'' N 86° 9' 50'' W39° 57' 14'' N86° 9' 43'' W39° 57' 10'' N 86° 9' 50'' W39° 57' 10'' N 86° 9' 43'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 16N WGS84 0 35 70 140 210 Feet 0 10 20 40 60 Meters Map Scale: 1:821 if printed on A landscape (11" x 8.5") 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 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 3/26/2021 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 0.6 21.3% UcfA Urban land-Crosby silt loam complex, fine-loamy subsoil, 0 to 2 percent slopes 2.3 78.7% Totals for Area of Interest 2.9 100.0% Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 3/26/2021 Page 3 of 3 Woolpert, Inc. 333 North Alabama Street, Suite 200 Indianapolis, IN 46204 317.299.7500 Appendix B ILLINOIS STREETSTR. 1.20.16 ACRESTC = 5 MIN.C = 0.61STR. 1.30.25 ACRESTC = 5 MIN.C = 0.59STR. 1.50.18 ACRESTC = 5 MIN.C = 0.82STR. 1.40.18 ACRESTC = 5 MIN.C = 0.74LEGENDBANK OF AMERICA CARMEL, IN PROPOSED STORM NETWORK BASIN MAP 333 North Alabama Street Suite 200 Indianapolis, IN 46204 317.299.7500 FAX: 317.291.5805 Bank of America - Carmel BAC 4/13/2021 1.2 1.3 Cover Type C Value Area (ac.) Cover Type C Value Area (ac.) Grass 0.20 0.06 Grass 0.20 0.10 Pavement 0.85 0.10 Pavement 0.85 0.15 Roof 0.90 0.00 Roof 0.90 0.00 Total Area = 0.16 Total Area = 0.25 Weighted C Value = 0.61 Weighted C Value = 0.59 1.4 1.5 Cover Type C Value Area (ac.) Cover Type C Value Area (ac.) Grass 0.20 0.03 Grass 0.20 0.01 Pavement 0.85 0.15 Pavement 0.85 0.07 Roof 0.90 0.00 Roof 0.90 0.10 Total Area = 0.18 Total Area = 0.18 Weighted C Value = 0.74 Weighted C Value = 0.82 StormCAD Model Diagram FlexTable: Catch Basin Table Hydraulic Grade Line (In) (ft) Flow (Captured) (cfs) Elevation (Invert) (ft) Elevation (Rim) (ft) LabelID 846.770.91846.31850.06CB-1.3109 846.520.60845.90849.96CB-1.2110 846.610.91846.15849.90CB-1.5113 845.530.82845.10849.36CB-1.4114 Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/13/2021 StormCAD [10.03.01.08] Bentley Systems, Inc. Haestad Methods Solution CenterBAC Carmel Drainage.stsw 10-Year FlexTable: Catchment Table Flow (Total Out) (cfs) Runoff MethodArea (User Defined) (acres) Time of Concentration (min) Runoff Coefficient (Rational) Outflow ElementLabelID 0.60Rational Method0.1605.0000.610CB-1.2CM-1.2122 0.91Rational Method0.1805.0000.820CB-1.5CM-1.5124 0.82Rational Method0.1805.0000.740CB-1.4CM-1.4125 0.91Rational Method0.2505.0000.590CB-1.3CM-1.3126 Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/13/2021 StormCAD [10.03.01.08]Bentley Systems, Inc. Haestad Methods Solution CenterBAC Carmel Drainage.stsw 10-Year FlexTable: Conduit Table System Flow Time (min) Hydraulic Grade Line (Out) (ft) Hydraulic Grade Line (In) (ft) Flow / Capacity (Design) (%) Capacity (Full Flow) (cfs) Flow (cfs) Velocity (Critical) (ft/s) Velocity (ft/s) Length (Unified) (ft) Manning's n Diameter (in) Slope (Calculated) (ft/ft) Invert (Stop) (ft) Invert (Start) (ft) Stop Node Start Node LabelID 6.439842.62842.8665.44.753.114.652.8744.00.01318.00.002841.95842.04EX.MH-1.0CO-1.0119 6.139842.86842.8830.44.811.463.822.3943.00.01318.00.002842.04842.13MH-1.0MH-1.1CO-1.1118 5.566846.07846.5270.52.111.494.082.91100.00.01312.00.004845.55845.90MH-1.1CB-1.2CO-1.2117 5.000846.52846.7743.02.110.913.592.5988.00.01312.00.004846.00846.31CB-1.2CB-1.3CO-1.3116 5.000845.36845.5338.22.150.823.492.5533.00.01312.00.004844.98845.10MH-1.0CB-1.4CO-1.4121 5.000846.35846.6143.12.110.913.592.5957.00.01312.00.004845.95846.15MH-1.0CB-1.5CO-1.5120 Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-16664/13/2021 StormCAD [10.03.01.08]Bentley Systems, Inc. Haestad Methods Solution CenterBAC Carmel Drainage.stsw 10-Year FlexTable: Manhole Table Hydraulic Grade Line (In) (ft) Flow (Total Out) (cfs) Flow (Local In) (cfs) Elevation (Invert) (ft) Elevation (Rim) (ft) Elevation (Ground) (ft) LabelID 842.881.460.00842.13849.99849.99MH-1.1111 842.863.110.00842.04850.00850.00MH-1.0112 Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/13/2021 StormCAD [10.03.01.08]Bentley Systems, Inc. Haestad Methods Solution CenterBAC Carmel Drainage.stsw 10-Year FlexTable: Outfall Table System Flow Time (min) Flow (Total Out) (cfs) Hydraulic Grade (ft) Elevation (Invert) (ft) Elevation (Ground) (ft) LabelID 6.6953.08842.62841.95849.55EX.115 Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/13/2021 StormCAD [10.03.01.08]Bentley Systems, Inc. Haestad Methods Solution CenterBAC Carmel Drainage.stsw 10-Year FlexTable: Catch Basin Table Hydraulic Grade Line (In) (ft) Flow (Captured) (cfs) Elevation (Invert) (ft) Elevation (Rim) (ft) LabelID 846.911.36846.31850.06CB-1.3109 846.730.90845.90849.96CB-1.2110 846.731.36846.15849.90CB-1.5113 845.641.22845.10849.36CB-1.4114 Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/13/2021 StormCAD [10.03.01.08] Bentley Systems, Inc. Haestad Methods Solution CenterBAC Carmel Drainage.stsw 100-Year FlexTable: Catchment Table Flow (Total Out) (cfs) Runoff MethodArea (User Defined) (acres) Time of Concentration (min) Runoff Coefficient (Rational) Outflow ElementLabelID 0.90Rational Method0.1605.0000.610CB-1.2CM-1.2122 1.36Rational Method0.1805.0000.820CB-1.5CM-1.5124 1.22Rational Method0.1805.0000.740CB-1.4CM-1.4125 1.36Rational Method0.2505.0000.590CB-1.3CM-1.3126 Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/13/2021 StormCAD [10.03.01.08]Bentley Systems, Inc. Haestad Methods Solution CenterBAC Carmel Drainage.stsw 100-Year FlexTable: Conduit Table System Flow Time (min) Hydraulic Grade Line (Out) (ft) Hydraulic Grade Line (In) (ft) Flow / Capacity (Design) (%) Capacity (Full Flow) (cfs) Flow (cfs) Velocity (Critical) (ft/s) Velocity (ft/s) Length (Unified) (ft) Manning's n Diameter (in) Slope (Calculated) (ft/ft) Invert (Stop) (ft) Invert (Start) (ft) Stop Node Start Node LabelID 6.332842.78843.0797.84.754.655.163.0644.00.01318.00.002841.95842.04EX.MH-1.0CO-1.0119 6.062843.07843.0945.44.812.184.242.6543.00.01318.00.002842.04842.13MH-1.0MH-1.1CO-1.1118 5.513846.19846.73105.32.112.224.533.04100.00.01312.00.004845.55845.90MH-1.1CB-1.2CO-1.2117 5.000846.73846.9164.12.111.363.982.8688.00.01312.00.004846.00846.31CB-1.2CB-1.3CO-1.3116 5.000845.45845.6457.02.151.223.872.8233.00.01312.00.004844.98845.10MH-1.0CB-1.4CO-1.4121 5.000846.44846.7364.32.111.363.982.8557.00.01312.00.004845.95846.15MH-1.0CB-1.5CO-1.5120 Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-16664/13/2021 StormCAD [10.03.01.08]Bentley Systems, Inc. Haestad Methods Solution CenterBAC Carmel Drainage.stsw 100-Year FlexTable: Manhole Table Hydraulic Grade Line (In) (ft) Flow (Total Out) (cfs) Flow (Local In) (cfs) Elevation (Invert) (ft) Elevation (Rim) (ft) Elevation (Ground) (ft) LabelID 843.092.180.00842.13849.99849.99MH-1.1111 843.074.650.00842.04850.00850.00MH-1.0112 Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/13/2021 StormCAD [10.03.01.08]Bentley Systems, Inc. Haestad Methods Solution CenterBAC Carmel Drainage.stsw 100-Year FlexTable: Outfall Table System Flow Time (min) Flow (Total Out) (cfs) Hydraulic Grade (ft) Elevation (Invert) (ft) Elevation (Ground) (ft) LabelID 6.5714.61842.78841.95849.55EX.115 Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/13/2021 StormCAD [10.03.01.08]Bentley Systems, Inc. Haestad Methods Solution CenterBAC Carmel Drainage.stsw 100-Year THE MAXIMUM FLOW CAPTURED BY AN INLET WITH A R-3010 CASTING IS 0.82 CFS (STRUCTURE 1.4) NEENAH R-3010 CAPACITY 3.4 CFS FULL CAPACITY 1.6 CFS HALF CAPACITY THE MAXIMUM FLOW CAPTURED BY AN INLET WITH A R-3405 CASTING IS 0.91 CFS (STRUCTURE 1.3 and 1.5) NEENAH R-3405 CAPACITY 4.5 CFS FULL CAPACITY 2.4 CFS HALF CAPACITY