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Home My WebLink AboutDrainage Report 07-13-223850 Priority Way South Drive, Suite 110 Indianapolis, IN. 46240 Phone: 317-779-2194 STORMWATER TECHNICAL INFORMATION REPORT PREPARED FOR: Dreyer & Reinbold Racing Building Addition 4501 W. 99th Street Carmel, IN 46032 July 13, 2022 3850 Priority Way South Drive, Suite 110 Indianapolis, IN. 46240 Phone: 317-779-2194 1 | P a g e PROJECT NARRATIVE INTRODUCTION This report summarizes the stormwater management calculations for the proposed Dreyer & Reinbold Racing building addition located at 4501 W. 99th Street, Carmel, Hamilton County, Indiana. The total site area is 6.18 acres, with the proposed improvement area consisting of only ±12,100 square feet. The stormwater analysis was performed based on the requirements of the City of Carmel Technical Standards Manual. SOILS Per the USDA NRCS Web Soil Survey, the primary soil types inside the project limits are Urban-land Crosby Silt Loam (UcfA) and Urban land Treaty complex (UmyA). A soils map is included in Appendix A. FLOODPLAIN Per the Flood Insurance Rate Map (FIRM) 18057C0225G, the site is not located in a floodplain (Zone X). A floodplain map is in Tab A. EXISTING CONDITIONS The existing site parcel is 6.18 acres and is currently developed as the Dreyer & Reyer Reinbold Racing facility. The existing building is ±52,000 square feet and is surrounded by concrete pavement on all sides that form parking areas, truck courts, and drives. The existing drive connection is to W. 99th Street. The west side of the building, which is where the proposed addition will be built, currently drains to an existing storm sewer system consisting of inlets and reinforced concrete pipe. Runoff is collected in the storm system and discharged to the south to an existing swale on the south property line. The entirety of the existing drainage areas is comprised of hard surface (roof, concrete pavement). The existing drainage areas and runoff calculations were analyzed for the areas of the proposed addition. The analyzed portion of the site drains to two different inlets, which combine to the same storm system. Individual runoff rates and the combined total are summarized in Table 1. Calculations can be seen in Appendix B. Table 1: Existing Drainage Summary Return Period Basin 2-year 10-year 100-year EX-1 1.96 cfs 2.59 cfs 3.86 cfs EX-2 2.72 cfs 3.59 cfs 5.35 cfs Total 4.68 cfs 6.18 cfs 9.21 cfs PROPOSED CONDITIONS The proposed development consists of the construction of a ±10,440 square-foot building addition to the west side of the building. The addition will be constructed over the existing concrete pavement. The existing pavement will be sawcut and removed only where necessary for the installation of the building foundations, which corresponds to less than 5,000 square feet of land truly being disturbed. The only drainage improvement to be made is the addition of ADS Duraslot pipe to provide a small trench drain in front of all overhead garage doors on the addition. The new piping will be connected to the existing system at a proposed manhole over the existing RCP. No stormwater detention is proposed since the site improvements do not add any new impervious areas. The theoretical proposed runoff is only negligible higher due to the “C” value for roof areas being 0.90 and pavement being 0.85. This is a negligible increase since both areas are impervious. Proposed individual runoff rates and the combined total are summarized in Table 2. Calculations can be seen in Appendix C. 3850 Priority Way South Drive, Suite 110 Indianapolis, IN. 46240 Phone: 317-779-2194 2 | P a g e Table 2: Proposed Drainage Summary Return Period Basin 2-year 10-year 100-year PROP-1 1.97 cfs 2.61 cfs 3.89 cfs PROP-2 2.76 cfs 3.64 cfs 5.43 cfs Total 4.73 cfs 6.25 cfs 9.32 cfs If you have any questions, feel free to contact me. Dillon Reynolds, PE dreynolds@spacecoinc.com 317-779-2194 3850 Priority Way South Drive, Suite 110 Indianapolis, IN. 46240 Phone: 317-779-2194 3 | P a g e APPENDICES Appendix A – Site Maps  Site Location Map  Soils Map  Wetlands Map  Flood Insurance Rate Map (FIRM) Appendix B – Existing Conditions  Existing Drainage Basin Map  Existing Composite C Calculations  Existing Runoff Calculations (Rational Method) Appendix C – Proposed Conditions  Proposed Drainage Basin Map  Proposed Composite C Value Calculations  Proposed Runoff Calculations (Rational Method) 3850 Priority Way South Drive, Suite 110 Indianapolis, IN. 46240 Phone: 317-779-2194 Appendix A Site Maps 500 ft N➤➤NSITE LOCATION PROJECT LOCATION Hydrologic Soil Group—Boone County, Indiana, and Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 7/15/2022 Page 1 of 5442024044202704420300442033044203604420390442042044204504420480442024044202704420300442033044203604420390442042044204504420480564830564860564890564920564950564980565010 564830 564860 564890 564920 564950 564980 565010 39° 55' 55'' N 86° 14' 29'' W39° 55' 55'' N86° 14' 20'' W39° 55' 46'' N 86° 14' 29'' W39° 55' 46'' N 86° 14' 20'' 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: 1:1,280 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. BUILDING ADDITION AREA MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons A A/D B B/D C C/D D Not rated or not available Soil Rating Lines A A/D B B/D C C/D D Not rated or not available Soil Rating Points A A/D B B/D C C/D D Not rated or not available 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 scales ranging from 1:12,000 to 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: Boone County, Indiana Survey Area Data: Version 24, Sep 3, 2021 Soil Survey Area: Hamilton County, Indiana Survey Area Data: Version 22, Sep 9, 2021 Your area of interest (AOI) includes more than one soil survey area. These survey areas may have been mapped at different scales, with a different land use in mind, at different times, or at different levels of detail. This may result in map unit symbols, soil properties, and interpretations that do not completely agree across soil survey area boundaries. 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 Hydrologic Soil Group—Boone County, Indiana, and Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 7/15/2022 Page 2 of 5 MAP LEGEND MAP INFORMATION 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. Hydrologic Soil Group—Boone County, Indiana, and Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 7/15/2022 Page 3 of 5 Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI CudA Crosby silt loam, fine- loamy subsoil, 0 to 2 percent slopes C/D 1.1 14.8% ThrA Treaty silty clay loam, 0 to 1 percent slopes B/D 0.6 8.4% Subtotals for Soil Survey Area 1.7 23.2% Totals for Area of Interest 7.5 100.0% Map unit symbol Map unit name Rating Acres in AOI Percent of AOI UcfA Urban land-Crosby silt loam complex, fine- loamy subsoil, 0 to 2 percent slopes 4.1 54.1% UmyA Urban land-Treaty complex, 0 to 1 percent slopes 1.7 22.7% Subtotals for Soil Survey Area 5.8 76.8% Totals for Area of Interest 7.5 100.0% Hydrologic Soil Group—Boone County, Indiana, and Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 7/15/2022 Page 4 of 5 Wetlands U.S. Fish and Wildlife Service, National Standards and Support Team,wetlands_team@fws.gov Wetlands Estuarine an d Marin e D eepwa ter Estuarine an d Marin e Wetlan d Freshwater Emergent Wetland Freshwater Forested/Shrub We tla nd Freshwater Pond Lake Other Riverine July 15 , 2022 0 0.1 0.20.05 mi 0 0.2 0.40.1 km 1:7,577 This page was produced by the NWI mapperNational Wetlands Inventory (NWI) This map is for general reference only. The US Fish and Wildlife Service is not responsible for the accuracy or currentness of the base data shown on this map. All wetlands related data should be used in accordance with the layer metadata found on the Wetlands Mapper web site. PROJECT LOCATION 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 7/15/2022 at 8:46 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°14'43"W 39°56'2"N 86°14'6"W 39°55'34"N Basemap: USGS National Map: Orthoimagery: Data refreshed October, 2020 PROJECT LOCATION 3850 Priority Way South Drive, Suite 110 Indianapolis, IN. 46240 Phone: 317-779-2194 Appendix B Existing Conditions 8918908 9 0 891891EX-1 A = 0.49 ac C = 0.86 Tc = 5 min EX-2 A = 0.67 ac C = 0.88 Tc = 5 min EXISTING DRAINAGE PLANEDP N R SCALE 1" = 20' 200 40 3850 Priority Way South Drive, Suite 110Indianapolis, IN 46240Phone: (317) 779-2194NO.DATEREMARKSFILENAME: DATE: JOB NO. SHEET 07/13/2022 12119 D&R RACING ADDITION4501 W. 99TH STREETCARMEL, IN 46032FILENAME: EDP PROJECT:D&R Racing Addition PROJECT #:12119 LOCATION:Carmel, IN DATE:7/13/2022 CALCULATION TITLE: DESCRIPTION:EXISTING DRAINAGE AREAS SITE CONDITION:EXISTING Rational Method Runoff Coefficients Roof 0.90 Asphalt 0.85 Concrete 0.85 Lawn 0.30 EX-1 Roof Asphalt/Concrete Lawn Total Total Composite (ft2) (ft 2) (ft 2) (ft 2)(acres) C 5,525 15,819 0 21,344 0.490 0.86 EX-2 Roof Asphalt/Concrete Lawn Total Total Composite (ft2) (ft 2) (ft 2) (ft 2)(acres) C 15,010 14,175 0 29,185 0.670 0.88 COMPOSITE C CALCULATIONS PROJECT:D&R Racing Addition PROJECT #:12119 LOCATION:Carmel, IN DATE:7/13/2022 CALCULATION TITLE: DESCRIPTION:RATIONAL METHOD RUNOFF SITE CONDITION:EXISTING 2-YR BASIN "C"i (in/hr)A (ac)Q (cfs) EX-1 0.86 4.63 0.49 1.96 EX-2 0.88 4.63 0.67 2.72 10-YR BASIN "C"i (in/hr)A (ac)Q (cfs) EX-1 0.86 6.12 0.49 2.59 EX-2 0.88 6.12 0.67 3.59 100-YR BASIN "C"i (in/hr)A (ac)Q (cfs) EX-1 0.86 9.12 0.49 3.86 EX-2 0.88 9.12 0.67 5.35 RUNOFF 3850 Priority Way South Drive, Suite 110 Indianapolis, IN. 46240 Phone: 317-779-2194 Appendix C Proposed Conditions PROPOSED ADDITION ±10,440 SF891890 8 9 0 891891PROP-1 A = 0.49 ac C = 0.87 Tc = 5 min PROP-2 A = 0.67 ac C = 0.89 Tc = 5 min PROPOSED DRAINAGE PLANPDP N R SCALE 1" = 20' 200 40 3850 Priority Way South Drive, Suite 110Indianapolis, IN 46240Phone: (317) 779-2194NO.DATEREMARKSFILENAME: DATE: JOB NO. SHEET 07/13/2022 12119 D&R RACING ADDITION4501 W. 99TH STREETCARMEL, IN 46032FILENAME: PDP PROJECT:D&R Racing Addition PROJECT #:12119 LOCATION:Carmel, IN DATE:7/13/2022 CALCULATION TITLE: DESCRIPTION:PROPOSED DRAINAGE AREAS SITE CONDITION:PROPOSED Rational Method Runoff Coefficients Roof 0.90 Asphalt 0.85 Concrete 0.85 Lawn 0.30 PROP-1 Roof Asphalt/Concrete Lawn Total Total Composite (ft2) (ft 2) (ft 2) (ft 2)(acres) C 8,625 12,719 0 21,344 0.490 0.87 PROP-2 Roof Asphalt/Concrete Lawn Total Total Composite (ft2) (ft 2) (ft 2) (ft 2)(acres) C 22,310 6,875 0 29,185 0.670 0.89 COMPOSITE C CALCULATIONS PROJECT:D&R Racing Addition PROJECT #:12119 LOCATION:Carmel, IN DATE:7/13/2022 CALCULATION TITLE: DESCRIPTION:RATIONAL METHOD RUNOFF SITE CONDITION:PROPOSED 2-YR BASIN "C"i (in/hr)A (ac)Q (cfs) PROP-1 0.87 4.63 0.49 1.97 PROP-2 0.89 4.63 0.67 2.76 10-YR BASIN "C"i (in/hr)A (ac)Q (cfs) PROP-1 0.87 6.12 0.49 2.61 PROP-2 0.89 6.12 0.67 3.64 10-YR BASIN "C"i (in/hr)A (ac)Q (cfs) PROP-1 0.87 9.12 0.49 3.89 PROP-2 0.89 9.12 0.67 5.43 RUNOFF