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Home My WebLink AboutDrainage Narrative 09-20-23 Stormwater & Floodplain Mitigation Narrative Fields Market Garden – 270 W Smoky Row Road City of Carmel Hamilton County, Indiana Prepared: September 19, 2023 By: CrossRoad Engineers, PC 115 N 17th Avenue Beech Grove, IN 46107 Phone No.: (317) 780-1555 Email: cmattox@crossroadengineers.com 115 N 17th AVE, BEECH GROVE, IN 46107 // 317.780.1555 // CROSSROADENGINEERS.COM Pre-Development Conditions The project site is situated on ±1.42 acres located at 270 W Smoky Row Road. See Exhibit 1 for the Location and Vicinity Map. The site currently consists of grass lawn area with some gardening area at the northwest corner of the site. Most of the project site lies within areas determined to be within the floodway and/or floodplains per Community Panel #18057C0207G of the Flood Insurance Rate Map dated November 19, 2014. See included FEMA Flood Map included in this report. The existing soils are Soil Group D, with an overall curve number of 80. The existing site drainage sheet flows northeasterly toward an existing swale that runs along the north property boundary. Post-Development Conditions This project includes the construction of a greenhouse and headhouse building for gardening and small-scale urban farming. The rest of the site will consist of grass area and planting beds with the exception of 14 parking spaces that will be pervious NDS Grass Pavers. Access to the project will be from the existing driveway that was recently reconstructed with the Smoky Row Road improvements. The proposed stormwater runoff will continue to infiltrate naturally and/or continue to sheet flow northeasterly to the existing swale. No storm sewer is proposed, and drainage is to follow existing drainage patterns. The only impervious area on site will be the ±1,600 sft roof area, and roof drainage will splash on grade. Due to the minimal impervious area added, the overall curve number for the site remains unchanged at 80, so no additional stormwater detention will be necessary to meet the City release rate requirements. Stormwater quality will be achieved via the pervious pavement BMP for parking, as well as the site serving almost entirely plant growth and vegetation. Floodplain Mitigation Much of the site is included in area that is delineated as both floodway and floodplain. Both of the proposed structures will be constructed outside of floodway areas. To meet the minimum 2’ freeboard above the Base Flood Elevation 813.00 for all permanent structures within Zone AE, some filling of the floodplain will be necessary. This fill will be mitigated onsite, with cut areas on the north portion of the site. The cut area will be graded such that drainage will continue to sheet flow northeasterly following existing drainage patterns. The earthwork balance is included with this report showing the total cut volume provided exceeds the total volume filled above the BFE of 813.00. LotPt4W S M O K Y R O W Lot Pt 4 READING TREE PARK TRADITIONS ON THE MONON 11TH ST NW 3RDAVENW2NDAVENW9TH ST NWMononTrai l TRAILSIDE DR GREENFORDTRLNW S M O K Y R O W Fields Market Garden - Location Map Parcels Street Centerlines Carmel Private City Boundary 2022 Photography Red: Red Green: Green Blue: Blue September 19, 2023 0 0.03 0.060.01 mi 0 0.06 0.110.03 km 1:2,000 ArcGIS WebApp Builder Hydrologic Soil Group—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/20/2023 Page 1 of 44426510442652044265304426540442655044265604426570442658044265904426600442661044266204426630442664044265104426520442653044265404426550442656044265704426580442659044266004426610442662044266304426640574050574060574070574080574090574100574110574120574130574140 574050 574060 574070 574080 574090 574100 574110 574120 574130 574140 39° 59' 12'' N 86° 7' 57'' W39° 59' 12'' N86° 7' 53'' W39° 59' 7'' N 86° 7' 57'' W39° 59' 7'' N 86° 7' 53'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 16N WGS84 0 30 60 120 180 Feet 0 5 10 20 30 Meters Map Scale: 1:645 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 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 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 23, Sep 3, 2022 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. Hydrologic Soil Group—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/20/2023 Page 2 of 4 Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI YshAH Shoals silt loam-Urban land complex, 0 to 2 percent slopes, frequently flooded, brief duration B/D 2.2 100.0% Totals for Area of Interest 2.2 100.0% Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Hydrologic Soil Group—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/20/2023 Page 3 of 4 Cut/Fill Report Generated:2023-09-20 14:02:33 By user:lcox Drawing:R:\Active\Uptown Partners\Field Market Garden\Design\CAD\Plans\C3D\R:\Active \Uptown Partners\Field Market Garden\Design\CAD\Plans\C3D\-Dirtwork.dwg Volume Summary Name Type Cut Factor Fill Factor 2d Area (Sq. Ft.) Cut (Cu. Yd.) Fill (Cu. Yd.) Net (Cu. Yd.) full 1.000 1.000 34854 449.29 444.81 4.48<Cut> Totals 2d Area (Sq. Ft.) Cut (Cu. Yd.) Fill (Cu. Yd.) Net (Cu. Yd.) Total 34854 449.29 444.81 4.48<Cut> * Value adjusted by cut or fill factor other than 1.0 Firefox file:///C:/Users/lcox/AppData/Local/Temp/CutFillReport.html 1 of 1 9/20/2023, 2:02 PM E-SURFACE vs P-PROPOSED