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HomeMy WebLinkAboutDrainage ReportCIVIL ENGINEERS LAND DEVELOPMENT CONSULTANTS DRAINAGE CONSULTANTS CERTIFIED FLOODPLAIN MANAGER 14020 Mississinewa Drive  Carmel, Indiana 46033  Phone: 317.324.8695  www.Fritz-Eng.com \\192.168.1.5\fes\Projects\2023\2307003 - Cherry Tree Farms\03 Civil\Engr\Drainage\FES 2307003 Drainage Report.docx HYDROLOGY AND DRAINAGE REPORT CHERRY TREE FARMS FES Project No.: 2307003 Project Location: 13777 Hazel Dell Parkway Carmel, Indiana 46033 Date: 09/18/2023 Last Revised: TABLE OF CONTENTS TABLE OF CONTENTS .................................................................................................. 2 PROJECT DESCRIPTION .............................................................................................. 4 PROJECT APPROXIMATE LATITUDE AND LONGITUDE ............................................. 4 FEMA MAP OVERVIEW ................................................................................................. 4 WATERSHED DESCRIPTION ........................................................................................ 4 SOILS OVERVIEW ......................................................................................................... 4 TABLE 1 – PROJECT SOILS 4 SOFTWARE .................................................................................................................... 5 RAINFALL DATA ............................................................................................................ 5 EXISTING CONDITIONS ................................................................................................ 5 TABLE 2 – EXISTING WATERSHED(S) PEAK RUNOFF 5 PROPOSED CONDITIONS ............................................................................................. 6 TABLE 3 – PROPOSED WATERSHED(S) PEAK RUNOFF 6 PROPOSED STORM INFRASTRUCTURE ..................................................................... 6 SUMMARY ...................................................................................................................... 7 REFERENCES ................................................................................................................ 7 APPENDICES ................................................................................................................. 8 Page 2 09/18/2023 APPENDICES APPENDIX A – LOCATION MAPS APPENDIX B – FEMA MAPS AND INFORMATION APPENDIX C – SOILS DATA AND MAPS APPENDIX D – RAINFALL DATA APPENDIX E – EXISTING CONDITIONS DRAINAGE ANALYSIS APPENDIX F – PROPOSED CONDITIONS DRAINAGE ANALYSIS Page 3 09/18/2023 PROJECT DESCRIPTION The client is proposing to split their existing 2.5 acre parcel into two lots so that the owner can sell the north half for a new residential building. This report was created to assist the owner in the application process to plat this parcel into two lots. PROJECT APPROXIMATE LATITUDE AND LONGITUDE Latitude: N39° 59’ 19” Longitude: W086° 04’ 16” FEMA MAP OVERVIEW The project site is located within the FEMA Community Panel Map No. 18057C0227G with an effective date of 11/19/2014. Review of the map indicates the site is located within the Flood Designation ‘Zone X’ (unshaded), “Areas determined to be outside the 0.2% annual chance floodplain”. The FEMA Map is included in Appendix B. WATERSHED DESCRIPTION The project site is located within the ‘White River – Vestal Ditch/Michener Ditch‘ watershed as provided on the IndianaMap GIS system. The 14-digit Hydrologic Unit Codes (HUC) for this watershed is 05120201090020. SOILS OVERVIEW The project site contains the soils listed in the following Table. The Hydrologic Soil Group (HSG) for each soil is also provided. The appropriate limits of each soil type are depicted in the Soils Map provided in Appendix C. TABLE 1 – PROJECT SOILS Note: It is good engineering practice that calculations for proposed conditions should compensate for the disturbance of the soil. This is accomplished by taking the current HSG value for that area and using the next restrictive HSG value for that same corresponding area for the proposed condition (post construction) runoff calculations. For example, if one area of the site has a soil group with a HSG of “C”, then during the proposed conditions analysis, that same soil group area HSG would be assigned an HSG value of “D”. If a soil group area existing HSG value is “D”, then no other value can be assigned and that soil group HSG will remain “D” during proposed conditions analysis. This procedure is only performed on areas that are being disturbed during construction. Areas that will remain the same and not be disturbed during construction will keep their existing HSG value for all analyses. Soil Symbol Soil Name, Description HSG YbvA Brookston silty clay loam-Urban land complex, 0 to 2 slopes B/D YcIA Crosby silt loam, fine-loamy subsoil-Urban land complex, 0 to 2 percent slopes C/D YmsA Miami silt loam-Urban land complex, 0 to 2 percent slopes C Page 4 09/18/2023 SOFTWARE Stormwater runoff, water quality units (as required), detention facilities (as required), etc. will be modeled using HydroCAD Stormwater Modeling v 10.00 software utilizing the SCS TR-20 and TR-55 methodologies. RAINFALL DATA Rainfall data as presented in the Indianapolis City of Carmel Stormwater Technical Standards Manual and Ordinances were utilized for all calculations and analyses. See Appendix D for this information. EXISTING CONDITIONS The project site is currently a residential parcel with one house located on it with areas of grass and wooded areas. The project site existing conditions has essentially two (2) distinct drainage patterns (existing watersheds) as described below: EX1 (SW) – This watershed sheet drains west / south / southwest across the west and south boundary lines. The storm runoff drains into an adjacent swale that flows along the west and south boundary lines on the adjacent plated lots. These swales diverge near the southwest corner of the property on the adjacent lot where the storm runoff is collected by an inlet storm pipe that is part of the adjoining Avian Glen Section Four subdivision. This storm pipe drains southwest away from the property. EX2 (East) – This watershed sheet drains east into Hazel Dell Parkway with the storm runoff being collected by curb inlets for the roadway. TABLE 2 – EXISTING WATERSHED(S) PEAK RUNOFF Runoff calculations for the existing conditions are computed and shown in Appendix E. For clarity, a map of the existing drainage watershed utilized for the calculations is also illustrated in Appendix E. Peak Runoff, cfs Watershed Name Area (acres) Wtd. ‘CN’ 2yr 10yr 25yr 50yr 100yr EX1 - SW 1.868 78 1.64 3.36 4.78 6.11 7.70 EX2 - East 0.651 74 0.66 1.45 2.13 2.77 3.54 Total (Per Link Node) 2.519 77 1.97 4.12 5.94 7.64 9.69 Page 5 09/18/2023 PROPOSED CONDITIONS The proposed conditions is to split the existing parcel into two lots, with the existing house and drive to remain on the south lot, and a new residential house with drive will be constructed on the proposed north lot. The project site proposed conditions has essentially two (2) distinct drainage patterns (watersheds) that remain very similar to the existing conditions watersheds as described below: PC1 (SW) – This watershed sheet drains west / south / southwest across the west and south boundary lines. The storm runoff drains into an adjacent swale that flows along the west and south boundary lines on the adjacent plated lots. These swales diverge near the southwest corner of the property on the adjacent lot where the storm runoff is collected by an inlet storm pipe that is part of the adjoining Avian Glen Section Four subdivision. This storm pipe drains southwest away from the property. PC2 (East) – This watershed sheet drains east into Hazel Dell Parkway with the storm runoff being collected by curb inlets for the roadway. TABLE 3 – PROPOSED WATERSHED(S) PEAK RUNOFF A map of the proposed conditions (developed) watersheds and storm runoff calculations are provided in Appendix F. PROPOSED STORM INFRASTRUCTURE Due to the nature of this project, no new or proposed storm infrastructure is being proposed. Peak Runoff, cfs Watershed Name Area (acres) Wtd. ‘CN’ 2yr 10yr 25yr 50yr 100yr EX1 - SW 1.680 80 1.69 3.29 4.61 5.82 7.27 EX2 - East 0.839 78 1.12 2.24 3.17 4.03 5.05 Total (Per Link Node) 2.519 79 2.37 4.73 6.67 8.47 10.62 Percent Increase 17% 13% 11% 10% 9% Page 6 09/18/2023 SUMMARY As a result of the onsite drainage analysis, the proposed improvements are not anticipated to have adverse impacts on the surrounding or downstream drainage systems. REFERENCES 1. Local County GIS 2. IndianaMap GIS 3. Hamilton County Soils Map (Web Soil Survey) 4. NOAA Rainfall Data (Per NOAA Website) 5. FEMA Flood Insurance Rate Maps, FEMA Website 6. Indiana Drainage Handbook 7. City of Carmel Stormwater Management Technical Standards Manual and Ordinances 8. INDOT Design Manual (Hydrology and Hydraulic Sections) and Standards Drawings 9. Neenah Catalog Page 7 09/18/2023 APPENDICES APPENDIX A – LOCATION MAPS APPENDIX B – FEMA MAPS AND INFORMATION APPENDIX C – SOILS DATA AND MAPS APPENDIX D – RAINFALL DATA APPENDIX E – EXISTING CONDITIONS DRAINAGE ANALYSIS APPENDIX F – PROPOSED CONDITIONS DRAINAGE ANALYSIS Page 8 09/18/2023 APPENDIX A – LOCATION MAPS Page 9 09/18/2023 Page 10 09/18/2023 APPENDIX B – FEMA MAPS AND INFORMATION Page 11 09/18/2023 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 7/31/2023 at 1:22 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°4'35"W 39°59'33"N 86°3'57"W 39°59'6"N Basemap Imagery Source: USGS National Map 2023 Page 12 09/18/2023 APPENDIX C – SOILS DATA AND MAPS Page 13 09/18/2023 Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2023 Page 1 of 3442685044268704426890442691044269304426950442697044269904427010442685044268704426890442691044269304426950442697044269904427010579240579260579280579300579320579340579360 579260 579280 579300 579320 579340 579360 39° 59' 22'' N 86° 4' 18'' W39° 59' 22'' N86° 4' 13'' W39° 59' 17'' N 86° 4' 18'' W39° 59' 17'' N 86° 4' 13'' 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: 1:807 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. Page 14 09/18/2023 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 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. Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2023 Page 2 of 3 Page 15 09/18/2023 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI YbvA Brookston silty clay loam- Urban land complex, 0 to 2 percent slopes 1.0 32.2% YclA Crosby silt loam, fine-loamy subsoil-Urban land complex, 0 to 2 percent slopes 0.5 15.4% YmsA Miami silt loam-Urban land complex, 0 to 2 percent slopes 1.6 52.3% Totals for Area of Interest 3.0 100.0% Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2023 Page 3 of 3 Page 16 09/18/2023 Water Features This table gives estimates of various soil water features. The estimates are used in land use planning that involves engineering considerations. 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 four hydrologic soil groups are: 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. Surface runoff refers to the loss of water from an area by flow over the land surface. Surface runoff classes are based on slope, climate, and vegetative cover. The concept indicates relative runoff for very specific conditions. It is assumed that the surface of the soil is bare and that the retention of surface water resulting from irregularities in the ground surface is minimal. The classes are negligible, very low, low, medium, high, and very high. The months in the table indicate the portion of the year in which a water table, ponding, and/or flooding is most likely to be a concern. Water Features---Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2023 Page 1 of 5 Page 17 09/18/2023 Water table refers to a saturated zone in the soil. The water features table indicates, by month, depth to the top ( upper limit ) and base ( lower limit ) of the saturated zone in most years. Estimates of the upper and lower limits are based mainly on observations of the water table at selected sites and on evidence of a saturated zone, namely grayish colors or mottles (redoximorphic features) in the soil. A saturated zone that lasts for less than a month is not considered a water table. The kind of water table, apparent or perched, is given if a seasonal high water table exists in the soil. A water table is perched if free water is restricted from moving downward in the soil by a restrictive feature, in most cases a hardpan; there is a dry layer of soil underneath a wet layer. A water table is apparent if free water is present in all horizons from its upper boundary to below 2 meters or to the depth of observation. The water table kind listed is for the first major component in the map unit. Ponding is standing water in a closed depression. Unless a drainage system is installed, the water is removed only by percolation, transpiration, or evaporation. The table indicates surface water depth and the duration and frequency of ponding. Duration is expressed as very brief if less than 2 days, brief if 2 to 7 days, long if 7 to 30 days, and very long if more than 30 days. Frequency is expressed as none, rare, occasional, and frequent. None means that ponding is not probable; rare that it is unlikely but possible under unusual weather conditions (the chance of ponding is nearly 0 percent to 5 percent in any year); occasional that it occurs, on the average, once or less in 2 years (the chance of ponding is 5 to 50 percent in any year); and frequent that it occurs, on the average, more than once in 2 years (the chance of ponding is more than 50 percent in any year). Flooding is the temporary inundation of an area caused by overflowing streams, by runoff from adjacent slopes, or by tides. Water standing for short periods after rainfall or snowmelt is not considered flooding, and water standing in swamps and marshes is considered ponding rather than flooding. Duration and frequency are estimated. Duration is expressed as extremely brief if 0.1 hour to 4 hours, very brief if 4 hours to 2 days, brief if 2 to 7 days, long if 7 to 30 days, and very long if more than 30 days. Frequency is expressed as none, very rare, rare, occasional, frequent, and very frequent. None means that flooding is not probable; very rare that it is very unlikely but possible under extremely unusual weather conditions (the chance of flooding is less than 1 percent in any year); rare that it is unlikely but possible under unusual weather conditions (the chance of flooding is 1 to 5 percent in any year); occasional that it occurs infrequently under normal weather conditions (the chance of flooding is 5 to 50 percent in any year); frequent that it is likely to occur often under normal weather conditions (the chance of flooding is more than 50 percent in any year but is less than 50 percent in all months in any year); and very frequent that it is likely to occur very often under normal weather conditions (the chance of flooding is more than 50 percent in all months of any year). The information is based on evidence in the soil profile, namely thin strata of gravel, sand, silt, or clay deposited by floodwater; irregular decrease in organic matter content with increasing depth; and little or no horizon development. Water Features---Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2023 Page 2 of 5 Page 18 09/18/2023 Also considered are local information about the extent and levels of flooding and the relation of each soil on the landscape to historic floods. Information on the extent of flooding based on soil data is less specific than that provided by detailed engineering surveys that delineate flood-prone areas at specific flood frequency levels. Water Features---Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2023 Page 3 of 5 Page 19 09/18/2023 Report—Water Features Map unit symbol and soil name Hydrologic group Surface runoff Most likely months Water table Ponding Flooding Upper limit Lower limit Kind Surface depth Duration Frequency Duration Frequency Ft Ft Ft YbvA—Brookston silty clay loam-Urban land complex, 0 to 2 percent slopes Brookston B/D Negligible Jan-May 0.0-1.0 6.0 Apparent 0.0-0.5 Long (7 to 30 days) Frequent —None Jun 4.0-5.0 6.0 Apparent ————None Jul-Oct ———————None Nov 4.0-5.0 6.0 Apparent ————None Dec 0.0-1.0 6.0 Apparent 0.0-0.5 Long (7 to 30 days) Frequent —None Urban land Very high ——————— YclA—Crosby silt loam, fine-loamy subsoil-Urban land complex, 0 to 2 percent slopes Crosby C/D Medium Jan-Mar 0.5-2.0 2.0-3.3 Perched ——None —None Apr-Jun 1.5-3.3 2.0-3.3 Perched ——None —None Jul-Sep —————None —None Oct-Nov 1.5-3.3 2.0-3.3 Perched ——None —None Dec 0.5-2.0 2.0-3.3 Perched ——None —None Urban land Very high ——————— YmsA—Miami silt loam-Urban land complex, 0 to 2 percent slopes Miami C Low Jan-Apr 2.0-3.5 2.5-3.5 Perched ——None —None May-Nov —————None —None Dec 2.0-3.5 2.5-3.5 Perched ——None —None Urban land Very high ——————— Water Features---Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2023 Page 4 of 5 Page 20 09/18/2023 Data Source Information Soil Survey Area: Hamilton County, Indiana Survey Area Data: Version 23, Sep 3, 2022 Water Features---Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2023 Page 5 of 5 Page 21 09/18/2023 APPENDIX D – RAINFALL DATA Page 22 09/18/2023 200-6 TABLE 201-2: Rainfall Intensities for Various Return Periods and Storm Durations Rainfall Intensity (Inches/Hour) Return Period (Years) Duration 2 5 10 25 50 100 5 Min. 4.63 5.43 6.12 7.17 8.09 9.12 10 Min. 3.95 4.63 5.22 6.12 6.90 7.78 15 Min. 3.44 4.03 4.55 5.33 6.01 6.77 20 Min. 3.04 3.56 4.02 4.71 5.31 5.99 30 Min. 2.46 2.88 3.25 3.81 4.29 4.84 40 Min. 2.05 2.41 2.71 3.18 3.59 4.05 50 Min. 1.76 2.06 2.33 2.73 3.07 3.47 1 Hr. 1.54 1.80 2.03 2.38 2.68 3.03 1.5 Hrs. 1.07 1.23 1.42 1.63 1.91 2.24 2 Hrs. 0.83 0.95 1.11 1.37 1.60 1.87 3 Hrs. 0.59 0.72 0.84 1.04 1.22 1.42 4 Hrs. 0.47 0.58 0.68 0.84 0.99 1.15 5 Hrs. 0.40 0.49 0.58 0.71 0.83 0.97 6 Hrs. 0.35 0.43 0.50 0.62 0.72 0.85 7 Hrs. 0.31 0.38 0.44 0.55 0.64 0.75 8 Hrs. 0.28 0.34 0.40 0.49 0.57 0.67 9 Hrs. 0.25 0.31 0.36 0.45 0.52 0.61 10 Hrs. 0.23 0.28 0.33 0.41 0.48 0.56 12 Hrs. 0.20 0.24 0.29 0.35 0.41 0.48 14 Hrs. 0.17 0.22 0.25 0.31 0.36 0.42 16 Hrs. 0.16 0.19 0.23 0.28 0.32 0.38 18 Hrs. 0.14 0.17 0.20 0.25 0.29 0.34 20 Hrs. 0.13 0.16 0.19 0.23 0.27 0.31 24 Hrs. 0.11 0.14 0.16 0.20 0.23 0.27 Source: Purdue,A.M., et. al., "Statistical Characteristics of Short Time Incremental Rainfall", Aug., 1992. (Values in this table are based on IDF equation and coefficients provided for Indianapolis, IN.) TABLE 201-3: Rainfall Depths for Various Return Periods Page 23 09/18/2023 Rainfall Depth (Inches) Return Period (Years) Duration 2 5 10 25 50 100 24 Hrs. 2.66 3.27 3.83 4.72 5.52 6.46 Source: Purdue,A.M., et. al., "Statistical Characteristics of Short Time Incremental Rainfall", Aug., 1992.(Values in this table are based on IDF equation and coefficients provided for Indianapolis, IN.) TABLE 201-4: NRCS Type 2 Rainfall Distribution Ordinates (for use when not already built in the computer program ) Cumulative Percent Cumulative Percent of Storm Depth Cumulative Percent Cumulative Percent of Storm Depth of Storm Time of Storm Time 0 0 52 73 4 1 53 75 10 2.5 54 77 15 4 55 78 20 6 56 80 25 8 57 81 30 10 58 82 33 12 60 83.5 35 13 63 86 38 15 65 87 40 16.5 67 88 42 19 70 89.5 43 20 72 91 44 21 75 92 45 22 77 93 46 23 80 94 47 26 83 95 48 30 85 96 48.5 34 87 97 48.7 37 90 98 49 50 95 99 50 64 100 100 51 71 200-7 Page 24 09/18/2023 APPENDIX E – EXISTING CONDITIONS DRAINAGE ANALYSIS Page 25 09/18/2023 Page 26 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment EX1: EX1 - SW Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 002-year 2.66 1.64 0.139 0.89 010-year 3.83 3.36 0.273 1.75 025-year 4.72 4.78 0.385 2.48 050-year 5.52 6.11 0.492 3.16 100-year 6.46 7.70 0.621 3.99 Page 27 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment EX2: EX2 - EAST Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 002-year 2.66 0.66 0.038 0.70 010-year 3.83 1.45 0.080 1.47 025-year 4.72 2.13 0.116 2.14 050-year 5.52 2.77 0.151 2.79 100-year 6.46 3.54 0.194 3.58 Page 28 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Events for Link 3L: Total Runoff Leaving Site Existing Event Inflow (cfs) Primary (cfs) Elevation (feet) 002-year 1.97 1.97 0.00 010-year 4.12 4.12 0.00 025-year 5.94 5.94 0.00 050-year 7.64 7.64 0.00 100-year 9.69 9.69 0.00 Page 29 09/18/2023 EX1 EX1 - SW EX2 EX2 - EAST 3L Total Runoff Leaving Site Existing Routing Diagram for Hamilton Co NCRS Type II Prepared by {enter your company name here}, Printed 9/18/2023 HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Subcat Reach Pond Link Page 30 09/18/2023 Type II 24-hr 002-year Rainfall=2.66"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 2HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Time span=0.01-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1.868 ac 7.76% Impervious Runoff Depth=0.89"Subcatchment EX1: EX1 - SW Flow Length=236' Tc=22.5 min CN=78 Runoff=1.64 cfs 0.139 af Runoff Area=0.651 ac 5.38% Impervious Runoff Depth=0.70"Subcatchment EX2: EX2 - EAST Flow Length=122' Tc=9.9 min CN=74 Runoff=0.66 cfs 0.038 af Inflow=1.97 cfs 0.177 afLink 3L: Total Runoff Leaving Site Existing Primary=1.97 cfs 0.177 af Page 31 09/18/2023 Type II 24-hr 002-year Rainfall=2.66"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 3HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment EX1: EX1 - SW Runoff = 1.64 cfs @ 12.17 hrs, Volume= 0.139 af, Depth= 0.89" Routed to Link 3L : Total Runoff Leaving Site Existing Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 002-year Rainfall=2.66" Area (ac) CN Description 0.265 74 >75% Grass cover, Good, HSG C 0.603 80 >75% Grass cover, Good, HSG D 0.641 77 Woods, Good, HSG D 0.214 70 Woods, Good, HSG C * 0.145 98 Impervious 1.868 78 Weighted Average 1.723 92.24% Pervious Area 0.145 7.76% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 21.5 100 0.0250 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.66" 0.3 61 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.7 75 0.0130 1.84 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 22.5 236 Total Page 32 09/18/2023 Type II 24-hr 002-year Rainfall=2.66"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 4HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Subcatchment EX1: EX1 - SW Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)1 0 Type II 24-hr 002-year Rainfall=2.66" Runoff Area=1.868 ac Runoff Volume=0.139 af Runoff Depth=0.89" Flow Length=236' Tc=22.5 min CN=78 1.64 cfs Page 33 09/18/2023 Type II 24-hr 002-year Rainfall=2.66"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 5HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment EX2: EX2 - EAST Runoff = 0.66 cfs @ 12.03 hrs, Volume= 0.038 af, Depth= 0.70" Routed to Link 3L : Total Runoff Leaving Site Existing Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 002-year Rainfall=2.66" Area (ac) CN Description 0.425 74 >75% Grass cover, Good, HSG C 0.018 80 >75% Grass cover, Good, HSG D 0.173 70 Woods, Good, HSG C * 0.035 98 Impervious 0.651 74 Weighted Average 0.616 94.62% Pervious Area 0.035 5.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.8 100 0.0250 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.66" 0.1 22 0.0450 3.42 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 9.9 122 Total Subcatchment EX2: EX2 - EAST Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)0.7 0.65 0.6 0.55 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 002-year Rainfall=2.66" Runoff Area=0.651 ac Runoff Volume=0.038 af Runoff Depth=0.70" Flow Length=122' Tc=9.9 min CN=74 0.66 cfs Page 34 09/18/2023 Type II 24-hr 002-year Rainfall=2.66"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 6HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Link 3L: Total Runoff Leaving Site Existing Inflow Area = 2.519 ac, 7.15% Impervious, Inflow Depth = 0.84" for 002-year event Inflow = 1.97 cfs @ 12.12 hrs, Volume= 0.177 af Primary = 1.97 cfs @ 12.12 hrs, Volume= 0.177 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Link 3L: Total Runoff Leaving Site Existing Inflow Primary Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)2 1 0 Inflow Area=2.519 ac 1.97 cfs1.97 cfs Page 35 09/18/2023 Type II 24-hr 010-year Rainfall=3.83"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 7HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Time span=0.01-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1.868 ac 7.76% Impervious Runoff Depth=1.75"Subcatchment EX1: EX1 - SW Flow Length=236' Tc=22.5 min CN=78 Runoff=3.36 cfs 0.273 af Runoff Area=0.651 ac 5.38% Impervious Runoff Depth=1.47"Subcatchment EX2: EX2 - EAST Flow Length=122' Tc=9.9 min CN=74 Runoff=1.45 cfs 0.080 af Inflow=4.12 cfs 0.353 afLink 3L: Total Runoff Leaving Site Existing Primary=4.12 cfs 0.353 af Page 36 09/18/2023 Type II 24-hr 010-year Rainfall=3.83"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 8HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment EX1: EX1 - SW Runoff = 3.36 cfs @ 12.16 hrs, Volume= 0.273 af, Depth= 1.75" Routed to Link 3L : Total Runoff Leaving Site Existing Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 010-year Rainfall=3.83" Area (ac) CN Description 0.265 74 >75% Grass cover, Good, HSG C 0.603 80 >75% Grass cover, Good, HSG D 0.641 77 Woods, Good, HSG D 0.214 70 Woods, Good, HSG C * 0.145 98 Impervious 1.868 78 Weighted Average 1.723 92.24% Pervious Area 0.145 7.76% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 21.5 100 0.0250 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.66" 0.3 61 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.7 75 0.0130 1.84 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 22.5 236 Total Page 37 09/18/2023 Type II 24-hr 010-year Rainfall=3.83"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 9HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Subcatchment EX1: EX1 - SW Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)3 2 1 0 Type II 24-hr 010-year Rainfall=3.83" Runoff Area=1.868 ac Runoff Volume=0.273 af Runoff Depth=1.75" Flow Length=236' Tc=22.5 min CN=78 3.36 cfs Page 38 09/18/2023 Type II 24-hr 010-year Rainfall=3.83"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 10HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment EX2: EX2 - EAST Runoff = 1.45 cfs @ 12.02 hrs, Volume= 0.080 af, Depth= 1.47" Routed to Link 3L : Total Runoff Leaving Site Existing Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 010-year Rainfall=3.83" Area (ac) CN Description 0.425 74 >75% Grass cover, Good, HSG C 0.018 80 >75% Grass cover, Good, HSG D 0.173 70 Woods, Good, HSG C * 0.035 98 Impervious 0.651 74 Weighted Average 0.616 94.62% Pervious Area 0.035 5.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.8 100 0.0250 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.66" 0.1 22 0.0450 3.42 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 9.9 122 Total Subcatchment EX2: EX2 - EAST Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)1 0 Type II 24-hr 010-year Rainfall=3.83" Runoff Area=0.651 ac Runoff Volume=0.080 af Runoff Depth=1.47" Flow Length=122' Tc=9.9 min CN=74 1.45 cfs Page 39 09/18/2023 Type II 24-hr 010-year Rainfall=3.83"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 11HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Link 3L: Total Runoff Leaving Site Existing Inflow Area = 2.519 ac, 7.15% Impervious, Inflow Depth = 1.68" for 010-year event Inflow = 4.12 cfs @ 12.10 hrs, Volume= 0.353 af Primary = 4.12 cfs @ 12.10 hrs, Volume= 0.353 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Link 3L: Total Runoff Leaving Site Existing Inflow Primary Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)4 3 2 1 0 Inflow Area=2.519 ac 4.12 cfs4.12 cfs Page 40 09/18/2023 Type II 24-hr 025-year Rainfall=4.72"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 12HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Time span=0.01-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1.868 ac 7.76% Impervious Runoff Depth=2.48"Subcatchment EX1: EX1 - SW Flow Length=236' Tc=22.5 min CN=78 Runoff=4.78 cfs 0.385 af Runoff Area=0.651 ac 5.38% Impervious Runoff Depth=2.14"Subcatchment EX2: EX2 - EAST Flow Length=122' Tc=9.9 min CN=74 Runoff=2.13 cfs 0.116 af Inflow=5.94 cfs 0.502 afLink 3L: Total Runoff Leaving Site Existing Primary=5.94 cfs 0.502 af Page 41 09/18/2023 Type II 24-hr 025-year Rainfall=4.72"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 13HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment EX1: EX1 - SW Runoff = 4.78 cfs @ 12.16 hrs, Volume= 0.385 af, Depth= 2.48" Routed to Link 3L : Total Runoff Leaving Site Existing Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 025-year Rainfall=4.72" Area (ac) CN Description 0.265 74 >75% Grass cover, Good, HSG C 0.603 80 >75% Grass cover, Good, HSG D 0.641 77 Woods, Good, HSG D 0.214 70 Woods, Good, HSG C * 0.145 98 Impervious 1.868 78 Weighted Average 1.723 92.24% Pervious Area 0.145 7.76% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 21.5 100 0.0250 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.66" 0.3 61 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.7 75 0.0130 1.84 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 22.5 236 Total Page 42 09/18/2023 Type II 24-hr 025-year Rainfall=4.72"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 14HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Subcatchment EX1: EX1 - SW Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)5 4 3 2 1 0 Type II 24-hr 025-year Rainfall=4.72" Runoff Area=1.868 ac Runoff Volume=0.385 af Runoff Depth=2.48" Flow Length=236' Tc=22.5 min CN=78 4.78 cfs Page 43 09/18/2023 Type II 24-hr 025-year Rainfall=4.72"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 15HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment EX2: EX2 - EAST Runoff = 2.13 cfs @ 12.02 hrs, Volume= 0.116 af, Depth= 2.14" Routed to Link 3L : Total Runoff Leaving Site Existing Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 025-year Rainfall=4.72" Area (ac) CN Description 0.425 74 >75% Grass cover, Good, HSG C 0.018 80 >75% Grass cover, Good, HSG D 0.173 70 Woods, Good, HSG C * 0.035 98 Impervious 0.651 74 Weighted Average 0.616 94.62% Pervious Area 0.035 5.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.8 100 0.0250 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.66" 0.1 22 0.0450 3.42 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 9.9 122 Total Subcatchment EX2: EX2 - EAST Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)2 1 0 Type II 24-hr 025-year Rainfall=4.72" Runoff Area=0.651 ac Runoff Volume=0.116 af Runoff Depth=2.14" Flow Length=122' Tc=9.9 min CN=74 2.13 cfs Page 44 09/18/2023 Type II 24-hr 025-year Rainfall=4.72"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 16HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Link 3L: Total Runoff Leaving Site Existing Inflow Area = 2.519 ac, 7.15% Impervious, Inflow Depth = 2.39" for 025-year event Inflow = 5.94 cfs @ 12.10 hrs, Volume= 0.502 af Primary = 5.94 cfs @ 12.10 hrs, Volume= 0.502 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Link 3L: Total Runoff Leaving Site Existing Inflow Primary Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)6 5 4 3 2 1 0 Inflow Area=2.519 ac 5.94 cfs5.94 cfs Page 45 09/18/2023 Type II 24-hr 050-year Rainfall=5.52"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 17HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Time span=0.01-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1.868 ac 7.76% Impervious Runoff Depth=3.16"Subcatchment EX1: EX1 - SW Flow Length=236' Tc=22.5 min CN=78 Runoff=6.11 cfs 0.492 af Runoff Area=0.651 ac 5.38% Impervious Runoff Depth=2.79"Subcatchment EX2: EX2 - EAST Flow Length=122' Tc=9.9 min CN=74 Runoff=2.77 cfs 0.151 af Inflow=7.64 cfs 0.643 afLink 3L: Total Runoff Leaving Site Existing Primary=7.64 cfs 0.643 af Page 46 09/18/2023 Type II 24-hr 050-year Rainfall=5.52"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 18HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment EX1: EX1 - SW Runoff = 6.11 cfs @ 12.16 hrs, Volume= 0.492 af, Depth= 3.16" Routed to Link 3L : Total Runoff Leaving Site Existing Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 050-year Rainfall=5.52" Area (ac) CN Description 0.265 74 >75% Grass cover, Good, HSG C 0.603 80 >75% Grass cover, Good, HSG D 0.641 77 Woods, Good, HSG D 0.214 70 Woods, Good, HSG C * 0.145 98 Impervious 1.868 78 Weighted Average 1.723 92.24% Pervious Area 0.145 7.76% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 21.5 100 0.0250 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.66" 0.3 61 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.7 75 0.0130 1.84 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 22.5 236 Total Page 47 09/18/2023 Type II 24-hr 050-year Rainfall=5.52"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 19HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Subcatchment EX1: EX1 - SW Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)6 5 4 3 2 1 0 Type II 24-hr 050-year Rainfall=5.52" Runoff Area=1.868 ac Runoff Volume=0.492 af Runoff Depth=3.16" Flow Length=236' Tc=22.5 min CN=78 6.11 cfs Page 48 09/18/2023 Type II 24-hr 050-year Rainfall=5.52"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 20HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment EX2: EX2 - EAST Runoff = 2.77 cfs @ 12.02 hrs, Volume= 0.151 af, Depth= 2.79" Routed to Link 3L : Total Runoff Leaving Site Existing Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 050-year Rainfall=5.52" Area (ac) CN Description 0.425 74 >75% Grass cover, Good, HSG C 0.018 80 >75% Grass cover, Good, HSG D 0.173 70 Woods, Good, HSG C * 0.035 98 Impervious 0.651 74 Weighted Average 0.616 94.62% Pervious Area 0.035 5.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.8 100 0.0250 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.66" 0.1 22 0.0450 3.42 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 9.9 122 Total Subcatchment EX2: EX2 - EAST Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)3 2 1 0 Type II 24-hr 050-year Rainfall=5.52" Runoff Area=0.651 ac Runoff Volume=0.151 af Runoff Depth=2.79" Flow Length=122' Tc=9.9 min CN=74 2.77 cfs Page 49 09/18/2023 Type II 24-hr 050-year Rainfall=5.52"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 21HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Link 3L: Total Runoff Leaving Site Existing Inflow Area = 2.519 ac, 7.15% Impervious, Inflow Depth = 3.06" for 050-year event Inflow = 7.64 cfs @ 12.09 hrs, Volume= 0.643 af Primary = 7.64 cfs @ 12.09 hrs, Volume= 0.643 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Link 3L: Total Runoff Leaving Site Existing Inflow Primary Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)8 7 6 5 4 3 2 1 0 Inflow Area=2.519 ac 7.64 cfs7.64 cfs Page 50 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 22HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Time span=0.01-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1.868 ac 7.76% Impervious Runoff Depth=3.99"Subcatchment EX1: EX1 - SW Flow Length=236' Tc=22.5 min CN=78 Runoff=7.70 cfs 0.621 af Runoff Area=0.651 ac 5.38% Impervious Runoff Depth=3.58"Subcatchment EX2: EX2 - EAST Flow Length=122' Tc=9.9 min CN=74 Runoff=3.54 cfs 0.194 af Inflow=9.69 cfs 0.815 afLink 3L: Total Runoff Leaving Site Existing Primary=9.69 cfs 0.815 af Page 51 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 23HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment EX1: EX1 - SW Runoff = 7.70 cfs @ 12.15 hrs, Volume= 0.621 af, Depth= 3.99" Routed to Link 3L : Total Runoff Leaving Site Existing Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 100-year Rainfall=6.46" Area (ac) CN Description 0.265 74 >75% Grass cover, Good, HSG C 0.603 80 >75% Grass cover, Good, HSG D 0.641 77 Woods, Good, HSG D 0.214 70 Woods, Good, HSG C * 0.145 98 Impervious 1.868 78 Weighted Average 1.723 92.24% Pervious Area 0.145 7.76% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 21.5 100 0.0250 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.66" 0.3 61 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.7 75 0.0130 1.84 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 22.5 236 Total Page 52 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 24HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Subcatchment EX1: EX1 - SW Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)8 7 6 5 4 3 2 1 0 Type II 24-hr 100-year Rainfall=6.46" Runoff Area=1.868 ac Runoff Volume=0.621 af Runoff Depth=3.99" Flow Length=236' Tc=22.5 min CN=78 7.70 cfs Page 53 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 25HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment EX2: EX2 - EAST Runoff = 3.54 cfs @ 12.01 hrs, Volume= 0.194 af, Depth= 3.58" Routed to Link 3L : Total Runoff Leaving Site Existing Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 100-year Rainfall=6.46" Area (ac) CN Description 0.425 74 >75% Grass cover, Good, HSG C 0.018 80 >75% Grass cover, Good, HSG D 0.173 70 Woods, Good, HSG C * 0.035 98 Impervious 0.651 74 Weighted Average 0.616 94.62% Pervious Area 0.035 5.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.8 100 0.0250 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.66" 0.1 22 0.0450 3.42 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 9.9 122 Total Subcatchment EX2: EX2 - EAST Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)3 2 1 0 Type II 24-hr 100-year Rainfall=6.46" Runoff Area=0.651 ac Runoff Volume=0.194 af Runoff Depth=3.58" Flow Length=122' Tc=9.9 min CN=74 3.54 cfs Page 54 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 26HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Link 3L: Total Runoff Leaving Site Existing Inflow Area = 2.519 ac, 7.15% Impervious, Inflow Depth = 3.88" for 100-year event Inflow = 9.69 cfs @ 12.09 hrs, Volume= 0.815 af Primary = 9.69 cfs @ 12.09 hrs, Volume= 0.815 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Link 3L: Total Runoff Leaving Site Existing Inflow Primary Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.519 ac 9.69 cfs9.69 cfs Page 55 09/18/2023 APPENDIX F – PROPOSED CONDITIONS DRAINAGE ANALYSIS Page 56 09/18/2023 Page 57 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment PC1: PC1 - SW Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 002-year 2.66 1.69 0.140 1.00 010-year 3.83 3.29 0.266 1.90 025-year 4.72 4.61 0.371 2.65 050-year 5.52 5.82 0.469 3.35 100-year 6.46 7.27 0.588 4.20 Page 58 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment PC2: PC2 - EAST Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 002-year 2.66 1.12 0.062 0.89 010-year 3.83 2.24 0.123 1.75 025-year 4.72 3.17 0.173 2.48 050-year 5.52 4.03 0.221 3.16 100-year 6.46 5.05 0.279 3.99 Page 59 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Events for Link 4L: Total Runoff Leaving Site Proposed Event Inflow (cfs) Primary (cfs) Elevation (feet) 002-year 2.37 2.37 0.00 010-year 4.73 4.73 0.00 025-year 6.67 6.67 0.00 050-year 8.47 8.47 0.00 100-year 10.62 10.62 0.00 Page 60 09/18/2023 PC1 PC1 - SW PC2 PC2 - EAST 4L Total Runoff Leaving Site Proposed Routing Diagram for Hamilton Co NCRS Type II Prepared by {enter your company name here}, Printed 9/18/2023 HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Subcat Reach Pond Link Page 61 09/18/2023 Type II 24-hr 002-year Rainfall=2.66"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 2HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment PC1: PC1 - SW Runoff = 1.69 cfs @ 12.17 hrs, Volume= 0.140 af, Depth= 1.00" Routed to Link 4L : Total Runoff Leaving Site Proposed Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 002-year Rainfall=2.66" Area (ac) CN Description 0.050 74 >75% Grass cover, Good, HSG C 0.630 80 >75% Grass cover, Good, HSG D 0.608 77 Woods, Good, HSG D 0.170 70 Woods, Good, HSG C * 0.222 98 Impervious 1.680 80 Weighted Average 1.458 86.79% Pervious Area 0.222 13.21% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 21.5 100 0.0250 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.66" 0.3 61 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.7 75 0.0130 1.84 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 22.5 236 Total Page 62 09/18/2023 Type II 24-hr 002-year Rainfall=2.66"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 3HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Subcatchment PC1: PC1 - SW Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)1 0 Type II 24-hr 002-year Rainfall=2.66" Runoff Area=1.680 ac Runoff Volume=0.140 af Runoff Depth=1.00" Flow Length=236' Tc=22.5 min CN=80 1.69 cfs Page 63 09/18/2023 Type II 24-hr 002-year Rainfall=2.66"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 4HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment PC2: PC2 - EAST Runoff = 1.12 cfs @ 12.02 hrs, Volume= 0.062 af, Depth= 0.89" Routed to Link 4L : Total Runoff Leaving Site Proposed Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 002-year Rainfall=2.66" Area (ac) CN Description 0.380 74 >75% Grass cover, Good, HSG C 0.178 80 >75% Grass cover, Good, HSG D 0.173 70 Woods, Good, HSG C * 0.108 98 Impervious 0.839 78 Weighted Average 0.731 87.13% Pervious Area 0.108 12.87% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.8 100 0.0250 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.66" 0.1 22 0.0450 3.42 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 9.9 122 Total Subcatchment PC2: PC2 - EAST Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)1 0 Type II 24-hr 002-year Rainfall=2.66" Runoff Area=0.839 ac Runoff Volume=0.062 af Runoff Depth=0.89" Flow Length=122' Tc=9.9 min CN=78 1.12 cfs Page 64 09/18/2023 Type II 24-hr 002-year Rainfall=2.66"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 5HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Link 4L: Total Runoff Leaving Site Proposed Inflow Area = 2.519 ac, 13.10% Impervious, Inflow Depth = 0.97" for 002-year event Inflow = 2.37 cfs @ 12.08 hrs, Volume= 0.203 af Primary = 2.37 cfs @ 12.08 hrs, Volume= 0.203 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Link 4L: Total Runoff Leaving Site Proposed Inflow Primary Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)2 1 0 Inflow Area=2.519 ac 2.37 cfs2.37 cfs Page 65 09/18/2023 Type II 24-hr 010-year Rainfall=3.83"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 6HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment PC1: PC1 - SW Runoff = 3.29 cfs @ 12.16 hrs, Volume= 0.266 af, Depth= 1.90" Routed to Link 4L : Total Runoff Leaving Site Proposed Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 010-year Rainfall=3.83" Area (ac) CN Description 0.050 74 >75% Grass cover, Good, HSG C 0.630 80 >75% Grass cover, Good, HSG D 0.608 77 Woods, Good, HSG D 0.170 70 Woods, Good, HSG C * 0.222 98 Impervious 1.680 80 Weighted Average 1.458 86.79% Pervious Area 0.222 13.21% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 21.5 100 0.0250 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.66" 0.3 61 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.7 75 0.0130 1.84 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 22.5 236 Total Page 66 09/18/2023 Type II 24-hr 010-year Rainfall=3.83"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 7HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Subcatchment PC1: PC1 - SW Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)3 2 1 0 Type II 24-hr 010-year Rainfall=3.83" Runoff Area=1.680 ac Runoff Volume=0.266 af Runoff Depth=1.90" Flow Length=236' Tc=22.5 min CN=80 3.29 cfs Page 67 09/18/2023 Type II 24-hr 010-year Rainfall=3.83"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 8HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment PC2: PC2 - EAST Runoff = 2.24 cfs @ 12.02 hrs, Volume= 0.123 af, Depth= 1.75" Routed to Link 4L : Total Runoff Leaving Site Proposed Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 010-year Rainfall=3.83" Area (ac) CN Description 0.380 74 >75% Grass cover, Good, HSG C 0.178 80 >75% Grass cover, Good, HSG D 0.173 70 Woods, Good, HSG C * 0.108 98 Impervious 0.839 78 Weighted Average 0.731 87.13% Pervious Area 0.108 12.87% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.8 100 0.0250 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.66" 0.1 22 0.0450 3.42 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 9.9 122 Total Subcatchment PC2: PC2 - EAST Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)2 1 0 Type II 24-hr 010-year Rainfall=3.83" Runoff Area=0.839 ac Runoff Volume=0.123 af Runoff Depth=1.75" Flow Length=122' Tc=9.9 min CN=78 2.24 cfs Page 68 09/18/2023 Type II 24-hr 010-year Rainfall=3.83"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 9HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Link 4L: Total Runoff Leaving Site Proposed Inflow Area = 2.519 ac, 13.10% Impervious, Inflow Depth = 1.85" for 010-year event Inflow = 4.73 cfs @ 12.07 hrs, Volume= 0.389 af Primary = 4.73 cfs @ 12.07 hrs, Volume= 0.389 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Link 4L: Total Runoff Leaving Site Proposed Inflow Primary Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)5 4 3 2 1 0 Inflow Area=2.519 ac 4.73 cfs4.73 cfs Page 69 09/18/2023 Type II 24-hr 025-year Rainfall=4.72"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 10HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment PC1: PC1 - SW Runoff = 4.61 cfs @ 12.16 hrs, Volume= 0.371 af, Depth= 2.65" Routed to Link 4L : Total Runoff Leaving Site Proposed Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 025-year Rainfall=4.72" Area (ac) CN Description 0.050 74 >75% Grass cover, Good, HSG C 0.630 80 >75% Grass cover, Good, HSG D 0.608 77 Woods, Good, HSG D 0.170 70 Woods, Good, HSG C * 0.222 98 Impervious 1.680 80 Weighted Average 1.458 86.79% Pervious Area 0.222 13.21% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 21.5 100 0.0250 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.66" 0.3 61 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.7 75 0.0130 1.84 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 22.5 236 Total Page 70 09/18/2023 Type II 24-hr 025-year Rainfall=4.72"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 11HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Subcatchment PC1: PC1 - SW Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)5 4 3 2 1 0 Type II 24-hr 025-year Rainfall=4.72" Runoff Area=1.680 ac Runoff Volume=0.371 af Runoff Depth=2.65" Flow Length=236' Tc=22.5 min CN=80 4.61 cfs Page 71 09/18/2023 Type II 24-hr 025-year Rainfall=4.72"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 12HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment PC2: PC2 - EAST Runoff = 3.17 cfs @ 12.02 hrs, Volume= 0.173 af, Depth= 2.48" Routed to Link 4L : Total Runoff Leaving Site Proposed Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 025-year Rainfall=4.72" Area (ac) CN Description 0.380 74 >75% Grass cover, Good, HSG C 0.178 80 >75% Grass cover, Good, HSG D 0.173 70 Woods, Good, HSG C * 0.108 98 Impervious 0.839 78 Weighted Average 0.731 87.13% Pervious Area 0.108 12.87% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.8 100 0.0250 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.66" 0.1 22 0.0450 3.42 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 9.9 122 Total Subcatchment PC2: PC2 - EAST Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)3 2 1 0 Type II 24-hr 025-year Rainfall=4.72" Runoff Area=0.839 ac Runoff Volume=0.173 af Runoff Depth=2.48" Flow Length=122' Tc=9.9 min CN=78 3.17 cfs Page 72 09/18/2023 Type II 24-hr 025-year Rainfall=4.72"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 13HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Link 4L: Total Runoff Leaving Site Proposed Inflow Area = 2.519 ac, 13.10% Impervious, Inflow Depth = 2.59" for 025-year event Inflow = 6.67 cfs @ 12.07 hrs, Volume= 0.544 af Primary = 6.67 cfs @ 12.07 hrs, Volume= 0.544 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Link 4L: Total Runoff Leaving Site Proposed Inflow Primary Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)7 6 5 4 3 2 1 0 Inflow Area=2.519 ac 6.67 cfs6.67 cfs Page 73 09/18/2023 Type II 24-hr 050-year Rainfall=5.52"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 14HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment PC1: PC1 - SW Runoff = 5.82 cfs @ 12.15 hrs, Volume= 0.469 af, Depth= 3.35" Routed to Link 4L : Total Runoff Leaving Site Proposed Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 050-year Rainfall=5.52" Area (ac) CN Description 0.050 74 >75% Grass cover, Good, HSG C 0.630 80 >75% Grass cover, Good, HSG D 0.608 77 Woods, Good, HSG D 0.170 70 Woods, Good, HSG C * 0.222 98 Impervious 1.680 80 Weighted Average 1.458 86.79% Pervious Area 0.222 13.21% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 21.5 100 0.0250 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.66" 0.3 61 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.7 75 0.0130 1.84 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 22.5 236 Total Page 74 09/18/2023 Type II 24-hr 050-year Rainfall=5.52"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 15HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Subcatchment PC1: PC1 - SW Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)6 5 4 3 2 1 0 Type II 24-hr 050-year Rainfall=5.52" Runoff Area=1.680 ac Runoff Volume=0.469 af Runoff Depth=3.35" Flow Length=236' Tc=22.5 min CN=80 5.82 cfs Page 75 09/18/2023 Type II 24-hr 050-year Rainfall=5.52"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 16HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment PC2: PC2 - EAST Runoff = 4.03 cfs @ 12.01 hrs, Volume= 0.221 af, Depth= 3.16" Routed to Link 4L : Total Runoff Leaving Site Proposed Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 050-year Rainfall=5.52" Area (ac) CN Description 0.380 74 >75% Grass cover, Good, HSG C 0.178 80 >75% Grass cover, Good, HSG D 0.173 70 Woods, Good, HSG C * 0.108 98 Impervious 0.839 78 Weighted Average 0.731 87.13% Pervious Area 0.108 12.87% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.8 100 0.0250 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.66" 0.1 22 0.0450 3.42 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 9.9 122 Total Subcatchment PC2: PC2 - EAST Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)4 3 2 1 0 Type II 24-hr 050-year Rainfall=5.52" Runoff Area=0.839 ac Runoff Volume=0.221 af Runoff Depth=3.16" Flow Length=122' Tc=9.9 min CN=78 4.03 cfs Page 76 09/18/2023 Type II 24-hr 050-year Rainfall=5.52"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 17HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Link 4L: Total Runoff Leaving Site Proposed Inflow Area = 2.519 ac, 13.10% Impervious, Inflow Depth = 3.29" for 050-year event Inflow = 8.47 cfs @ 12.07 hrs, Volume= 0.690 af Primary = 8.47 cfs @ 12.07 hrs, Volume= 0.690 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Link 4L: Total Runoff Leaving Site Proposed Inflow Primary Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)9 8 7 6 5 4 3 2 1 0 Inflow Area=2.519 ac 8.47 cfs8.47 cfs Page 77 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 18HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment PC1: PC1 - SW Runoff = 7.27 cfs @ 12.15 hrs, Volume= 0.588 af, Depth= 4.20" Routed to Link 4L : Total Runoff Leaving Site Proposed Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 100-year Rainfall=6.46" Area (ac) CN Description 0.050 74 >75% Grass cover, Good, HSG C 0.630 80 >75% Grass cover, Good, HSG D 0.608 77 Woods, Good, HSG D 0.170 70 Woods, Good, HSG C * 0.222 98 Impervious 1.680 80 Weighted Average 1.458 86.79% Pervious Area 0.222 13.21% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 21.5 100 0.0250 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.66" 0.3 61 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.7 75 0.0130 1.84 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 22.5 236 Total Page 78 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 19HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Subcatchment PC1: PC1 - SW Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)8 7 6 5 4 3 2 1 0 Type II 24-hr 100-year Rainfall=6.46" Runoff Area=1.680 ac Runoff Volume=0.588 af Runoff Depth=4.20" Flow Length=236' Tc=22.5 min CN=80 7.27 cfs Page 79 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 20HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment PC2: PC2 - EAST Runoff = 5.05 cfs @ 12.01 hrs, Volume= 0.279 af, Depth= 3.99" Routed to Link 4L : Total Runoff Leaving Site Proposed Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Type II 24-hr 100-year Rainfall=6.46" Area (ac) CN Description 0.380 74 >75% Grass cover, Good, HSG C 0.178 80 >75% Grass cover, Good, HSG D 0.173 70 Woods, Good, HSG C * 0.108 98 Impervious 0.839 78 Weighted Average 0.731 87.13% Pervious Area 0.108 12.87% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.8 100 0.0250 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.66" 0.1 22 0.0450 3.42 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 9.9 122 Total Subcatchment PC2: PC2 - EAST Runoff Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)5 4 3 2 1 0 Type II 24-hr 100-year Rainfall=6.46" Runoff Area=0.839 ac Runoff Volume=0.279 af Runoff Depth=3.99" Flow Length=122' Tc=9.9 min CN=78 5.05 cfs Page 80 09/18/2023 Type II 24-hr 100-year Rainfall=6.46"Hamilton Co NCRS Type II Printed 9/18/2023Prepared by {enter your company name here} Page 21HydroCAD® 10.10-6a s/n 10557 © 2020 HydroCAD Software Solutions LLC Summary for Link 4L: Total Runoff Leaving Site Proposed Inflow Area = 2.519 ac, 13.10% Impervious, Inflow Depth = 4.13" for 100-year event Inflow = 10.62 cfs @ 12.06 hrs, Volume= 0.867 af Primary = 10.62 cfs @ 12.06 hrs, Volume= 0.867 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.01-72.01 hrs, dt= 0.05 hrs Link 4L: Total Runoff Leaving Site Proposed Inflow Primary Hydrograph Time (hours) 706560555045403530252015105Flow (cfs)11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.519 ac 10.62 cfs10.62 cfs Page 81 09/18/2023