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STORMWATER REPORT - 23-00605 - Dutch Bros - New Commercial Bldg
STORMWATER REPORT Dutch Bros Coffee, Rexburg 855 West Main Street Rexburg, ID 83301 Prepared for: Dutch Bros., LLC 110 SW 4th Street Grants Pass, OR 97523 August 31, 2023 Our Job No. 22674 8/31/2023 22674.005-StormWATR.doc TABLE OF CONTENTS 1. PROJECT OVERVIEW 2. STORM WATER MANAGEMENT PLAN TABLE OF FIGURES 1. VICINITY MAP 2. AERIAL IMAGE TABLE OF TABLES 1. SUB-BASIN SUMMARY 2. STORM FACILITY SUMMARY APPENDICES A. NRCS SOILS MAP B. DEVELOPED CONDITIONS MAP C. HYDROCAD REPORTS D. GEOTECHNICAL INVESTIGATION 22674.005-StormWATR.doc PROJECT OVERVIEW The project site is located at the southeast corner of the intersection of US Highway 20 and West Main Street (Highway 33), in the City of Rexburg, Idaho. The site comprises a single lot: lot 1 of Cross Charitable Foundation Subdivision (Tax Parcel number RPR4CCF0000010), being 0.80 acres in size. Additional offsite work is being performed on the parcel directly south of the site (lot 2 of Cross Charitable Foundation Subdivision, Tax Parcel number RPR4CCF0000020), bringing the total project area to approximately 0.99 acres. 22674.005-StormWATR.doc Figure 1: Vicinity Map Figure 2: Aerial Image 22674.005-StormWATR.doc The property is zoned as Community Business Center (CBC), and is currently vacant with frontage improvements including sidewalk, landscaping, and utilities. The site is bounded to the east by a private access road, to the north by West Main Street (Highway 33), to the west by US Highway 20, and to the south by additional vacant land zoned CBC. Access to the site will be provided from the eastern private access road. The site is relatively flat and does not receive any runoff from upstream properties, nor does the site discharge runoff to downstream properties. The existing pervious ground cover of the site results in on-site infiltration of all runoff generated on the site. STORMWATER MANAGEMENT PLAN According to the City of Rexburg engineering standards, the required stormwater design uses the 25- YR/1-HR storm, as well as the 100-YR/1-HR storm. Rainfall values and runoff coefficients were established in accordance with the State of Idaho Catalog of Storm Water Best Management Practices (BMPs), as well as Appendix B of the Idaho Department of Transportation (IDT) Roadway Design Manual. Based on figures B-7 and B-8 (sheet 7 of 9) of Appendix B of the IDT Roadway Design Manual, the rainfall intensity for the two required storm events were determined to be 0.9 inches/hour (25-YR/1-HR) and 1.25 inches/hour (100-YR/1-HR). Table 8 of the State of Idaho Catalog of Storm Water BMPs was used to determine runoff curve number (CN) values of 98 for all impervious areas and 74 for all previous areas. A time of concentration of 5 minutes was used. The stormwater modeling was performed using the HydroCAD 10.00 computer program which utilizes the SCS TR-20 methodology to calculate the hydrographs and stormwater runoff flows. The site is split into five sub-basins: On-site Impervious, On-site Pervious, Off-site South, Northwest, and East. Table 1 summarizes these sub-basins, while Table 2 summarizes the receiving storm facilities. • The two on-site sub-basins include the new building, drive lanes, parking area, pond area, and internal landscaping improvements. The stormwater runoff from these on-site sub-basins will be collected in a series of catch basins and/or storm piping and routed to the on-site detention pond. • Runoff generated with the off-site south sub-basin will sheet flow south to a detention swale on the neighboring parcel. All runoff contributing to this sub-basin is generated from off-site improvements (half drive aisle), there is no contribution from on-site runoff. • All runoff contributing to the northwest sub-basin is pervious and consistent with pre-development conditions. No storm management/improvements are proposed with this sub-basin, all runoff will sheet flow northwest to be dispersed via surface infiltration. • Runoff contributing to the east sub-basin is from on-site landscaping and sidewalk surfaces. This runoff sheet flows east to both on-site and off-site landscape areas, where the runoff is dispersed via surface infiltration prior to reaching the private roadway. No storm management/improvements are proposed with this sub-basin. $ J H R W H F K Q L F D O L Q Y H V W L J D W L R Q $ S S H Q G L [ ' Z D V S U H S D U H G E \ $ W O D V 7 H F K Q L F D O & R Q V X O W D Q W V I R U W K H S U R M H F W G D W H G $ X J X V W 7 K H V R L O V H Q F R X Q W H U H G F R Q V L V W R I V D Q G \ O H D Q F O D \ Q H D U W K H V X U I D F H I H H W G H H S Z L W K X Q G H U O \ L Q J V D Q G V D Q G J U D Y H O V 7 K H V R L O V D U H F O D V V L I L H G D V W \ S H µ & ¶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¶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tormWATR.doc The developed conditions map included in appendix B shows the on-site drainage basins and general flow patterns for the stormwater runoff. Table 1: Sub-Basin Summary Sub-Basin Description Area (SF) CN Runoff Generated (CF) Peak Runoff Rate (cfs) Facility 25-YR 100-YR 25-YR 100-YR 1S On-site Impervious 21,878 98 1,266 1,886 0.88 1.27 1P 2S On-site Pervious 6,673 74 6 41 0.01 0.04 1P 3S Off-site South 3,919 98 227 338 0.16 0.23 2P 4S Northwest 4,887 74 4 30 0.01 0.03 N/A 5S East 1,564 86* 20 44 0.02 0.04 N/A * A weighted CN value was applied, based on the ratio of pervious (759 SF) to impervious (805 SF) contributing surfaces. Table 2: Storm Facility Summary Storm System Description Storage Description Storm Event Available Storage Req. Storage Infiltration Rate Peak Elevation 1P Detention Pond 10.5’x20’ pond bottom at elev. 4851.50, 3.5’ deep, 3:1 side slopes 25-YR 2,394 CF 1,211 CF 100-YR 2,394 CF 1,864 CF 2P Detention Swale 1’x235’ swale bottom at elev. 4854.50, 1’ deep, 3:1 side slopes 25-YR 955 CF 227 CF 0.0 in/hr 4854.92’ 100-YR 955 CF 338 CF 0.0 in/hr 4855.04’ 8.0 in/hr 8.0 in/hr 4853.83’ 4854.51’ Appendix A Soil Map—Madison County Area, Idaho Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2023 Page 1 of 3 48 5 2 8 1 0 48 5 2 8 2 0 48 5 2 8 3 0 48 5 2 8 4 0 48 5 2 8 5 0 48 5 2 8 6 0 48 5 2 8 7 0 48 5 2 8 8 0 48 5 2 8 0 0 48 5 2 8 1 0 48 5 2 8 2 0 48 5 2 8 3 0 48 5 2 8 4 0 48 5 2 8 5 0 48 5 2 8 6 0 48 5 2 8 7 0 434830 434840 434850 434860 434870 434880 434890 434900 434910 434920 434930 434940 434830 434840 434850 434860 434870 434880 434890 434900 434910 434920 434930 434940 43° 49' 34'' N 11 1 ° 4 8 ' 3 8 ' ' W 43° 49' 34'' N 11 1 ° 4 8 ' 3 2 ' ' W 43° 49' 31'' N 11 1 ° 4 8 ' 3 8 ' ' W 43° 49' 31'' N 11 1 ° 4 8 ' 3 2 ' ' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 12N WGS84 0 25 50 100 150 Feet 0 5 10 20 30 Meters Map Scale: 1:557 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 1:24,000. 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: Madison County Area, Idaho Survey Area Data: Version 17, Sep 2, 2022 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 20, 2022—Jul 25, 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—Madison County Area, Idaho Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2023 Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 5 Blackfoot silt loam 1.5 100.0% Totals for Area of Interest 1.5 100.0% Soil Map—Madison County Area, Idaho Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2023 Page 3 of 3 Madison County Area, Idaho 5—Blackfoot silt loam Map Unit Setting National map unit symbol: 2tdh Elevation: 4,200 to 6,300 feet Mean annual precipitation: 9 to 12 inches Mean annual air temperature: 43 to 45 degrees F Frost-free period: 95 to 126 days Farmland classification: Prime farmland if irrigated and drained Map Unit Composition Blackfoot and similar soils:85 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Blackfoot Setting Landform:Flood plains, terraces Down-slope shape:Linear Across-slope shape:Linear Parent material:Mixed alluvium Typical profile Ap - 0 to 10 inches: silt loam Bw1 - 10 to 16 inches: silt loam Bw2 - 16 to 22 inches: silty clay loam Bk - 22 to 35 inches: silt loam C1 - 35 to 42 inches: sandy loam C2 - 42 to 60 inches: silt loam Properties and qualities Slope:0 to 1 percent Depth to restrictive feature:More than 80 inches Drainage class:Somewhat poorly drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.20 to 0.60 in/hr) Depth to water table:About 18 to 36 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:15 percent Maximum salinity:Very slightly saline to slightly saline (2.0 to 4.0 mmhos/cm) Sodium adsorption ratio, maximum:5.0 Available water supply, 0 to 60 inches: High (about 11.4 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 6c Hydrologic Soil Group: C Map Unit Description: Blackfoot silt loam---Madison County Area, Idaho Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2023 Page 1 of 2 Ecological site: R011XB021ID - Meadow DECA18-CANE2 Hydric soil rating: No Data Source Information Soil Survey Area: Madison County Area, Idaho Survey Area Data: Version 17, Sep 2, 2022 Map Unit Description: Blackfoot silt loam---Madison County Area, Idaho Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2023 Page 2 of 2 Appendix B DU T C H B R O S C O F F E E 95 0 S Q . F T . DE V E L O P E D C O N D I T I O N S M A P 1 O F 1 SCALE: 1"=10' “ “ ” “ ” ”Dial 811 Callbefore you dig. below.Know what's HIGHWAY 33 / W. MAIN ST PR I V A T E D R I V E US H I G H W A Y 2 0 Appendix C Sample C 1-hr 25-yr, 1-hr Rainfall=0.90"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Summary for Pond 1P: POND Inflow Area = 28,551 sf, 76.63% Impervious, Inflow Depth = 0.53" for 25-yr, 1-hr event Inflow = 0.88 cfs @ 0.45 hrs, Volume= 1,272 cf Outflow = 0.04 cfs @ 0.20 hrs, Volume= 1,272 cf, Atten= 95%, Lag= 0.0 min Discarded = 0.04 cfs @ 0.20 hrs, Volume= 1,272 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 4,853.83' @ 0.85 hrs Surf.Area= 0 sf Storage= 1,157 cf Plug-Flow detention time= 244.7 min calculated for 1,269 cf (100% of inflow) Center-of-Mass det. time= 245.2 min ( 275.1 - 29.9 ) Volume Invert Avail.Storage Storage Description #1 4,851.50' 2,394 cf Custom Stage Data Listed below Elevation Cum.Store (feet) (cubic-feet) 4,851.50 0 4,851.75 62 4,852.00 136 4,852.25 223 4,852.50 325 4,852.75 442 4,853.00 576 4,853.25 728 4,853.50 898 4,853.75 1,089 4,854.00 1,301 4,854.25 1,536 4,854.50 1,795 4,854.75 2,080 4,855.00 2,394 Device Routing Invert Outlet Devices #1 Discarded 4,851.50'0.04 cfs Exfiltration when above 4,851.50' Discarded OutFlow Max=0.04 cfs @ 0.20 hrs HW=4,851.54' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Infiltration was applied only to the surface area of the pond bottom, to avoid modeling infiltration through the sandy lean clay soils. To simulate infiltration, a constant infiltration flow of was applied to the pond, based on the calculation below. (Pond Bottom Area) x (Infiltration Rate) x (Conversion Factors) (211.18 SF) x x (1 LF / 12 in) x (1 hr / 3600 sec) = (8 in / hr)0.04 cfs 8 in/hr 0.04 cfs Sample C 1-hr 25-yr, 1-hr Rainfall=0.90"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Pond 1P: POND Inflow Discarded Hydrograph Time (hours) 2423222120191817161514131211109876543210 Fl o w ( c f s ) 0.95 0.9 0.85 0.8 0.75 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 Inflow Area=28,551 sf Peak Elev=4,853.83' Storage=1,157 cf 0.88 cfs 0.04 cfs Sample C 1-hr 25-yr, 1-hr Rainfall=0.90"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: POND Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 0.00 0.00 0 4,851.50 0.00 0.05 0.00 0 4,851.50 0.00 0.10 0.00 0 4,851.50 0.00 0.15 0.01 1 4,851.50 0.00 0.20 0.12 9 4,851.54 0.04 0.25 0.27 36 4,851.65 0.04 0.30 0.50 99 4,851.87 0.04 0.35 0.75 204 4,852.19 0.04 0.40 0.83 338 4,852.53 0.04 0.45 0.88 484 4,852.83 0.04 0.50 0.83 630 4,853.09 0.04 0.55 0.77 766 4,853.31 0.04 0.60 0.63 885 4,853.48 0.04 0.65 0.48 977 4,853.60 0.04 0.70 0.40 1,050 4,853.70 0.04 0.75 0.31 1,107 4,853.77 0.04 0.80 0.18 1,144 4,853.82 0.04 0.85 0.05 1,157 4,853.83 0.04 0.90 0.03 1,157 4,853.83 0.04 0.95 0.02 1,155 4,853.83 0.04 1.00 0.01 1,151 4,853.82 0.04 1.05 0.00 1,145 4,853.82 0.04 1.10 0.00 1,138 4,853.81 0.04 1.15 0.00 1,130 4,853.80 0.04 1.20 0.00 1,123 4,853.79 0.04 1.25 0.00 1,116 4,853.78 0.04 1.30 0.00 1,109 4,853.77 0.04 1.35 0.00 1,102 4,853.76 0.04 1.40 0.00 1,094 4,853.76 0.04 1.45 0.00 1,087 4,853.75 0.04 1.50 0.00 1,080 4,853.74 0.04 1.55 0.00 1,073 4,853.73 0.04 1.60 0.00 1,066 4,853.72 0.04 1.65 0.00 1,058 4,853.71 0.04 1.70 0.00 1,051 4,853.70 0.04 1.75 0.00 1,044 4,853.69 0.04 1.80 0.00 1,037 4,853.68 0.04 1.85 0.00 1,030 4,853.67 0.04 1.90 0.00 1,022 4,853.66 0.04 1.95 0.00 1,015 4,853.65 0.04 2.00 0.00 1,008 4,853.64 0.04 2.05 0.00 1,001 4,853.63 0.04 2.10 0.00 994 4,853.63 0.04 2.15 0.00 986 4,853.62 0.04 2.20 0.00 979 4,853.61 0.04 2.25 0.00 972 4,853.60 0.04 2.30 0.00 965 4,853.59 0.04 2.35 0.00 958 4,853.58 0.04 2.40 0.00 950 4,853.57 0.04 2.45 0.00 943 4,853.56 0.04 2.50 0.00 936 4,853.55 0.04 2.55 0.00 929 4,853.54 0.04 Sample C 1-hr 25-yr, 1-hr Rainfall=0.90"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: POND (continued) Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 2.60 0.00 922 4,853.53 0.04 2.65 0.00 914 4,853.52 0.04 2.70 0.00 907 4,853.51 0.04 2.75 0.00 900 4,853.50 0.04 2.80 0.00 893 4,853.49 0.04 2.85 0.00 886 4,853.48 0.04 2.90 0.00 878 4,853.47 0.04 2.95 0.00 871 4,853.46 0.04 3.00 0.00 864 4,853.45 0.04 3.05 0.00 857 4,853.44 0.04 3.10 0.00 850 4,853.43 0.04 3.15 0.00 842 4,853.42 0.04 3.20 0.00 835 4,853.41 0.04 3.25 0.00 828 4,853.40 0.04 3.30 0.00 821 4,853.39 0.04 3.35 0.00 814 4,853.38 0.04 3.40 0.00 806 4,853.37 0.04 3.45 0.00 799 4,853.35 0.04 3.50 0.00 792 4,853.34 0.04 3.55 0.00 785 4,853.33 0.04 3.60 0.00 778 4,853.32 0.04 3.65 0.00 770 4,853.31 0.04 3.70 0.00 763 4,853.30 0.04 3.75 0.00 756 4,853.29 0.04 3.80 0.00 749 4,853.28 0.04 3.85 0.00 742 4,853.27 0.04 3.90 0.00 734 4,853.26 0.04 3.95 0.00 727 4,853.25 0.04 4.00 0.00 720 4,853.24 0.04 4.05 0.00 713 4,853.23 0.04 4.10 0.00 706 4,853.21 0.04 4.15 0.00 698 4,853.20 0.04 4.20 0.00 691 4,853.19 0.04 4.25 0.00 684 4,853.18 0.04 4.30 0.00 677 4,853.17 0.04 4.35 0.00 670 4,853.15 0.04 4.40 0.00 662 4,853.14 0.04 4.45 0.00 655 4,853.13 0.04 4.50 0.00 648 4,853.12 0.04 4.55 0.00 641 4,853.11 0.04 4.60 0.00 634 4,853.09 0.04 4.65 0.00 626 4,853.08 0.04 4.70 0.00 619 4,853.07 0.04 4.75 0.00 612 4,853.06 0.04 4.80 0.00 605 4,853.05 0.04 4.85 0.00 598 4,853.04 0.04 4.90 0.00 590 4,853.02 0.04 4.95 0.00 583 4,853.01 0.04 5.00 0.00 576 4,853.00 0.04 5.05 0.00 569 4,852.99 0.04 5.10 0.00 562 4,852.97 0.04 5.15 0.00 554 4,852.96 0.04 Sample C 1-hr 25-yr, 1-hr Rainfall=0.90"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: POND (continued) Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 5.20 0.00 547 4,852.95 0.04 5.25 0.00 540 4,852.93 0.04 5.30 0.00 533 4,852.92 0.04 5.35 0.00 526 4,852.91 0.04 5.40 0.00 518 4,852.89 0.04 5.45 0.00 511 4,852.88 0.04 5.50 0.00 504 4,852.87 0.04 5.55 0.00 497 4,852.85 0.04 5.60 0.00 490 4,852.84 0.04 5.65 0.00 482 4,852.83 0.04 5.70 0.00 475 4,852.81 0.04 5.75 0.00 468 4,852.80 0.04 5.80 0.00 461 4,852.79 0.04 5.85 0.00 454 4,852.77 0.04 5.90 0.00 446 4,852.76 0.04 5.95 0.00 439 4,852.74 0.04 6.00 0.00 432 4,852.73 0.04 6.05 0.00 425 4,852.71 0.04 6.10 0.00 418 4,852.70 0.04 6.15 0.00 410 4,852.68 0.04 6.20 0.00 403 4,852.67 0.04 6.25 0.00 396 4,852.65 0.04 6.30 0.00 389 4,852.64 0.04 6.35 0.00 382 4,852.62 0.04 6.40 0.00 374 4,852.61 0.04 6.45 0.00 367 4,852.59 0.04 6.50 0.00 360 4,852.57 0.04 6.55 0.00 353 4,852.56 0.04 6.60 0.00 346 4,852.54 0.04 6.65 0.00 338 4,852.53 0.04 6.70 0.00 331 4,852.51 0.04 6.75 0.00 324 4,852.50 0.04 6.80 0.00 317 4,852.48 0.04 6.85 0.00 310 4,852.46 0.04 6.90 0.00 302 4,852.44 0.04 6.95 0.00 295 4,852.43 0.04 7.00 0.00 288 4,852.41 0.04 7.05 0.00 281 4,852.39 0.04 7.10 0.00 274 4,852.37 0.04 7.15 0.00 266 4,852.36 0.04 7.20 0.00 259 4,852.34 0.04 7.25 0.00 252 4,852.32 0.04 7.30 0.00 245 4,852.30 0.04 7.35 0.00 238 4,852.29 0.04 7.40 0.00 230 4,852.27 0.04 7.45 0.00 223 4,852.25 0.04 7.50 0.00 216 4,852.23 0.04 7.55 0.00 209 4,852.21 0.04 7.60 0.00 202 4,852.19 0.04 7.65 0.00 194 4,852.17 0.04 7.70 0.00 187 4,852.15 0.04 7.75 0.00 180 4,852.13 0.04 Sample C 1-hr 25-yr, 1-hr Rainfall=0.90"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: POND (continued) Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 7.80 0.00 173 4,852.11 0.04 7.85 0.00 166 4,852.09 0.04 7.90 0.00 158 4,852.06 0.04 7.95 0.00 151 4,852.04 0.04 8.00 0.00 144 4,852.02 0.04 8.05 0.00 137 4,852.00 0.04 8.10 0.00 130 4,851.98 0.04 8.15 0.00 122 4,851.95 0.04 8.20 0.00 115 4,851.93 0.04 8.25 0.00 108 4,851.91 0.04 8.30 0.00 101 4,851.88 0.04 8.35 0.00 94 4,851.86 0.04 8.40 0.00 86 4,851.83 0.04 8.45 0.00 79 4,851.81 0.04 8.50 0.00 72 4,851.78 0.04 8.55 0.00 65 4,851.76 0.04 8.60 0.00 58 4,851.73 0.04 8.65 0.00 50 4,851.70 0.04 8.70 0.00 43 4,851.67 0.04 8.75 0.00 36 4,851.65 0.04 8.80 0.00 29 4,851.62 0.04 8.85 0.00 22 4,851.59 0.04 8.90 0.00 14 4,851.56 0.04 8.95 0.00 8 4,851.53 0.04 9.00 0.00 3 4,851.51 0.01 9.05 0.00 1 4,851.51 0.01 9.10 0.00 1 4,851.50 0.00 9.15 0.00 0 4,851.50 0.00 9.20 0.00 0 4,851.50 0.00 9.25 0.00 0 4,851.50 0.00 9.30 0.00 0 4,851.50 0.00 9.35 0.00 0 4,851.50 0.00 9.40 0.00 0 4,851.50 0.00 9.45 0.00 0 4,851.50 0.00 9.50 0.00 0 4,851.50 0.00 9.55 0.00 0 4,851.50 0.00 9.60 0.00 0 4,851.50 0.00 9.65 0.00 0 4,851.50 0.00 9.70 0.00 0 4,851.50 0.00 9.75 0.00 0 4,851.50 0.00 9.80 0.00 0 4,851.50 0.00 9.85 0.00 0 4,851.50 0.00 9.90 0.00 0 4,851.50 0.00 9.95 0.00 0 4,851.50 0.00 10.00 0.00 0 4,851.50 0.00 10.05 0.00 0 4,851.50 0.00 10.10 0.00 0 4,851.50 0.00 10.15 0.00 0 4,851.50 0.00 10.20 0.00 0 4,851.50 0.00 10.25 0.00 0 4,851.50 0.00 10.30 0.00 0 4,851.50 0.00 10.35 0.00 0 4,851.50 0.00 Sample C 1-hr 25-yr, 1-hr Rainfall=0.90"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: POND Elevation (feet) Storage (cubic-feet) 4,851.50 0 4,851.55 12 4,851.60 25 4,851.65 37 4,851.70 50 4,851.75 62 4,851.80 77 4,851.85 92 4,851.90 106 4,851.95 121 4,852.00 136 4,852.05 153 4,852.10 171 4,852.15 188 4,852.20 206 4,852.25 223 4,852.30 243 4,852.35 264 4,852.40 284 4,852.45 305 4,852.50 325 4,852.55 348 4,852.60 372 4,852.65 395 4,852.70 419 4,852.75 442 4,852.80 469 4,852.85 496 4,852.90 522 4,852.95 549 4,853.00 576 4,853.05 606 4,853.10 637 4,853.15 667 4,853.20 698 4,853.25 728 4,853.30 762 4,853.35 796 4,853.40 830 4,853.45 864 4,853.50 898 4,853.55 936 4,853.60 974 4,853.65 1,013 4,853.70 1,051 4,853.75 1,089 4,853.80 1,131 4,853.85 1,174 4,853.90 1,216 4,853.95 1,259 4,854.00 1,301 4,854.05 1,348 Elevation (feet) Storage (cubic-feet) 4,854.10 1,395 4,854.15 1,442 4,854.20 1,489 4,854.25 1,536 4,854.30 1,588 4,854.35 1,640 4,854.40 1,691 4,854.45 1,743 4,854.50 1,795 4,854.55 1,852 4,854.60 1,909 4,854.65 1,966 4,854.70 2,023 4,854.75 2,080 4,854.80 2,143 4,854.85 2,206 4,854.90 2,268 4,854.95 2,331 4,855.00 2,394 Sample C 1-hr 25-yr, 1-hr Rainfall=0.90"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: POND Elevation (feet) Discarded (cfs) 4,851.50 0.00 4,851.51 0.04 4,851.52 0.04 4,851.53 0.04 4,851.54 0.04 4,851.55 0.04 4,851.56 0.04 4,851.57 0.04 4,851.58 0.04 4,851.59 0.04 4,851.60 0.04 4,851.61 0.04 4,851.62 0.04 4,851.63 0.04 4,851.64 0.04 4,851.65 0.04 4,851.66 0.04 4,851.67 0.04 4,851.68 0.04 4,851.69 0.04 4,851.70 0.04 4,851.71 0.04 4,851.72 0.04 4,851.73 0.04 4,851.74 0.04 4,851.75 0.04 4,851.76 0.04 4,851.77 0.04 4,851.78 0.04 4,851.79 0.04 4,851.80 0.04 4,851.81 0.04 4,851.82 0.04 4,851.83 0.04 4,851.84 0.04 4,851.85 0.04 4,851.86 0.04 4,851.87 0.04 4,851.88 0.04 4,851.89 0.04 4,851.90 0.04 4,851.91 0.04 4,851.92 0.04 4,851.93 0.04 4,851.94 0.04 4,851.95 0.04 4,851.96 0.04 4,851.97 0.04 4,851.98 0.04 4,851.99 0.04 4,852.00 0.04 4,852.01 0.04 Elevation (feet) Discarded (cfs) 4,852.02 0.04 4,852.03 0.04 4,852.04 0.04 4,852.05 0.04 4,852.06 0.04 4,852.07 0.04 4,852.08 0.04 4,852.09 0.04 4,852.10 0.04 4,852.11 0.04 4,852.12 0.04 4,852.13 0.04 4,852.14 0.04 4,852.15 0.04 4,852.16 0.04 4,852.17 0.04 4,852.18 0.04 4,852.19 0.04 4,852.20 0.04 4,852.21 0.04 4,852.22 0.04 4,852.23 0.04 4,852.24 0.04 4,852.25 0.04 4,852.26 0.04 4,852.27 0.04 4,852.28 0.04 4,852.29 0.04 4,852.30 0.04 4,852.31 0.04 4,852.32 0.04 4,852.33 0.04 4,852.34 0.04 4,852.35 0.04 4,852.36 0.04 4,852.37 0.04 4,852.38 0.04 4,852.39 0.04 4,852.40 0.04 4,852.41 0.04 4,852.42 0.04 4,852.43 0.04 4,852.44 0.04 4,852.45 0.04 4,852.46 0.04 4,852.47 0.04 4,852.48 0.04 4,852.49 0.04 4,852.50 0.04 4,852.51 0.04 4,852.52 0.04 4,852.53 0.04 Elevation (feet) Discarded (cfs) 4,852.54 0.04 4,852.55 0.04 4,852.56 0.04 4,852.57 0.04 4,852.58 0.04 4,852.59 0.04 4,852.60 0.04 4,852.61 0.04 4,852.62 0.04 4,852.63 0.04 4,852.64 0.04 4,852.65 0.04 4,852.66 0.04 4,852.67 0.04 4,852.68 0.04 4,852.69 0.04 4,852.70 0.04 4,852.71 0.04 4,852.72 0.04 4,852.73 0.04 4,852.74 0.04 4,852.75 0.04 4,852.76 0.04 4,852.77 0.04 4,852.78 0.04 4,852.79 0.04 4,852.80 0.04 4,852.81 0.04 4,852.82 0.04 4,852.83 0.04 4,852.84 0.04 4,852.85 0.04 4,852.86 0.04 4,852.87 0.04 4,852.88 0.04 4,852.89 0.04 4,852.90 0.04 4,852.91 0.04 4,852.92 0.04 4,852.93 0.04 4,852.94 0.04 4,852.95 0.04 4,852.96 0.04 4,852.97 0.04 4,852.98 0.04 4,852.99 0.04 4,853.00 0.04 4,853.01 0.04 4,853.02 0.04 4,853.03 0.04 4,853.04 0.04 4,853.05 0.04 Elevation (feet) Discarded (cfs) 4,853.06 0.04 4,853.07 0.04 4,853.08 0.04 4,853.09 0.04 4,853.10 0.04 4,853.11 0.04 4,853.12 0.04 4,853.13 0.04 4,853.14 0.04 4,853.15 0.04 4,853.16 0.04 4,853.17 0.04 4,853.18 0.04 4,853.19 0.04 4,853.20 0.04 4,853.21 0.04 4,853.22 0.04 4,853.23 0.04 4,853.24 0.04 4,853.25 0.04 4,853.26 0.04 4,853.27 0.04 4,853.28 0.04 4,853.29 0.04 4,853.30 0.04 4,853.31 0.04 4,853.32 0.04 4,853.33 0.04 4,853.34 0.04 4,853.35 0.04 4,853.36 0.04 4,853.37 0.04 4,853.38 0.04 4,853.39 0.04 4,853.40 0.04 4,853.41 0.04 4,853.42 0.04 4,853.43 0.04 4,853.44 0.04 4,853.45 0.04 4,853.46 0.04 4,853.47 0.04 4,853.48 0.04 4,853.49 0.04 4,853.50 0.04 4,853.51 0.04 4,853.52 0.04 4,853.53 0.04 4,853.54 0.04 4,853.55 0.04 4,853.56 0.04 4,853.57 0.04 Sample C 1-hr 25-yr, 1-hr Rainfall=0.90"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: POND (continued) Elevation (feet) Discarded (cfs) 4,853.58 0.04 4,853.59 0.04 4,853.60 0.04 4,853.61 0.04 4,853.62 0.04 4,853.63 0.04 4,853.64 0.04 4,853.65 0.04 4,853.66 0.04 4,853.67 0.04 4,853.68 0.04 4,853.69 0.04 4,853.70 0.04 4,853.71 0.04 4,853.72 0.04 4,853.73 0.04 4,853.74 0.04 4,853.75 0.04 4,853.76 0.04 4,853.77 0.04 4,853.78 0.04 4,853.79 0.04 4,853.80 0.04 4,853.81 0.04 4,853.82 0.04 4,853.83 0.04 4,853.84 0.04 4,853.85 0.04 4,853.86 0.04 4,853.87 0.04 4,853.88 0.04 4,853.89 0.04 4,853.90 0.04 4,853.91 0.04 4,853.92 0.04 4,853.93 0.04 4,853.94 0.04 4,853.95 0.04 4,853.96 0.04 4,853.97 0.04 4,853.98 0.04 4,853.99 0.04 4,854.00 0.04 4,854.01 0.04 4,854.02 0.04 4,854.03 0.04 4,854.04 0.04 4,854.05 0.04 4,854.06 0.04 4,854.07 0.04 4,854.08 0.04 4,854.09 0.04 Elevation (feet) Discarded (cfs) 4,854.10 0.04 4,854.11 0.04 4,854.12 0.04 4,854.13 0.04 4,854.14 0.04 4,854.15 0.04 4,854.16 0.04 4,854.17 0.04 4,854.18 0.04 4,854.19 0.04 4,854.20 0.04 4,854.21 0.04 4,854.22 0.04 4,854.23 0.04 4,854.24 0.04 4,854.25 0.04 4,854.26 0.04 4,854.27 0.04 4,854.28 0.04 4,854.29 0.04 4,854.30 0.04 4,854.31 0.04 4,854.32 0.04 4,854.33 0.04 4,854.34 0.04 4,854.35 0.04 4,854.36 0.04 4,854.37 0.04 4,854.38 0.04 4,854.39 0.04 4,854.40 0.04 4,854.41 0.04 4,854.42 0.04 4,854.43 0.04 4,854.44 0.04 4,854.45 0.04 4,854.46 0.04 4,854.47 0.04 4,854.48 0.04 4,854.49 0.04 4,854.50 0.04 4,854.51 0.04 4,854.52 0.04 4,854.53 0.04 4,854.54 0.04 4,854.55 0.04 4,854.56 0.04 4,854.57 0.04 4,854.58 0.04 4,854.59 0.04 4,854.60 0.04 4,854.61 0.04 Elevation (feet) Discarded (cfs) 4,854.62 0.04 4,854.63 0.04 4,854.64 0.04 4,854.65 0.04 4,854.66 0.04 4,854.67 0.04 4,854.68 0.04 4,854.69 0.04 4,854.70 0.04 4,854.71 0.04 4,854.72 0.04 4,854.73 0.04 4,854.74 0.04 4,854.75 0.04 4,854.76 0.04 4,854.77 0.04 4,854.78 0.04 4,854.79 0.04 4,854.80 0.04 4,854.81 0.04 4,854.82 0.04 4,854.83 0.04 4,854.84 0.04 4,854.85 0.04 4,854.86 0.04 4,854.87 0.04 4,854.88 0.04 4,854.89 0.04 4,854.90 0.04 4,854.91 0.04 4,854.92 0.04 4,854.93 0.04 4,854.94 0.04 4,854.95 0.04 4,854.96 0.04 4,854.97 0.04 4,854.98 0.04 4,854.99 0.04 4,855.00 0.04 Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Summary for Pond 1P: POND Inflow Area = 28,551 sf, 76.63% Impervious, Inflow Depth = 0.81" for 100-yr, 1-hr event Inflow = 1.27 cfs @ 0.45 hrs, Volume= 1,927 cf Outflow = 0.04 cfs @ 0.20 hrs, Volume= 1,927 cf, Atten= 97%, Lag= 0.0 min Discarded = 0.04 cfs @ 0.20 hrs, Volume= 1,927 cf Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 4,854.51' @ 0.93 hrs Surf.Area= 0 sf Storage= 1,806 cf Plug-Flow detention time= 380.3 min calculated for 1,923 cf (100% of inflow) Center-of-Mass det. time= 381.1 min ( 410.5 - 29.5 ) Volume Invert Avail.Storage Storage Description #1 4,851.50' 2,394 cf Custom Stage Data Listed below Elevation Cum.Store (feet) (cubic-feet) 4,851.50 0 4,851.75 62 4,852.00 136 4,852.25 223 4,852.50 325 4,852.75 442 4,853.00 576 4,853.25 728 4,853.50 898 4,853.75 1,089 4,854.00 1,301 4,854.25 1,536 4,854.50 1,795 4,854.75 2,080 4,855.00 2,394 Device Routing Invert Outlet Devices #1 Discarded 4,851.50'0.04 cfs Exfiltration when above 4,851.50' Discarded OutFlow Max=0.04 cfs @ 0.20 hrs HW=4,851.61' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Infiltration was applied only to the surface area of the pond bottom, to avoid modeling infiltration through the sandy lean clay soils. To simulate infiltration, a constant infiltration flow of was applied to the pond, based on the calculation below. (Pond Bottom Area) x (Infiltration Rate) x (Conversion Factors) (211.18 SF) x x (1 LF / 12 in) x (1 hr / 3600 sec) = (8 in / hr)0.04 cfs 8 in/hr 0.04 cfs Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Pond 1P: POND Inflow Discarded Hydrograph Time (hours) 2423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=28,551 sf Peak Elev=4,854.51' Storage=1,806 cf 1.27 cfs 0.04 cfs Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: POND Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 0.00 0.00 0 4,851.50 0.00 0.05 0.00 0 4,851.50 0.00 0.10 0.00 0 4,851.50 0.00 0.15 0.07 4 4,851.52 0.02 0.20 0.25 27 4,851.61 0.04 0.25 0.48 85 4,851.83 0.04 0.30 0.80 194 4,852.17 0.04 0.35 1.14 361 4,852.58 0.04 0.40 1.22 567 4,852.98 0.04 0.45 1.27 784 4,853.33 0.04 0.50 1.21 1,000 4,853.63 0.04 0.55 1.13 1,203 4,853.88 0.04 0.60 0.93 1,382 4,854.09 0.04 0.65 0.72 1,523 4,854.24 0.04 0.70 0.59 1,633 4,854.34 0.04 0.75 0.46 1,721 4,854.43 0.04 0.80 0.27 1,780 4,854.49 0.04 0.85 0.07 1,802 4,854.51 0.04 0.90 0.05 1,806 4,854.51 0.04 0.95 0.03 1,806 4,854.51 0.04 1.00 0.02 1,803 4,854.51 0.04 1.05 0.00 1,798 4,854.50 0.04 1.10 0.00 1,790 4,854.50 0.04 1.15 0.00 1,783 4,854.49 0.04 1.20 0.00 1,776 4,854.48 0.04 1.25 0.00 1,769 4,854.47 0.04 1.30 0.00 1,762 4,854.47 0.04 1.35 0.00 1,754 4,854.46 0.04 1.40 0.00 1,747 4,854.45 0.04 1.45 0.00 1,740 4,854.45 0.04 1.50 0.00 1,733 4,854.44 0.04 1.55 0.00 1,726 4,854.43 0.04 1.60 0.00 1,718 4,854.43 0.04 1.65 0.00 1,711 4,854.42 0.04 1.70 0.00 1,704 4,854.41 0.04 1.75 0.00 1,697 4,854.41 0.04 1.80 0.00 1,690 4,854.40 0.04 1.85 0.00 1,682 4,854.39 0.04 1.90 0.00 1,675 4,854.38 0.04 1.95 0.00 1,668 4,854.38 0.04 2.00 0.00 1,661 4,854.37 0.04 2.05 0.00 1,654 4,854.36 0.04 2.10 0.00 1,646 4,854.36 0.04 2.15 0.00 1,639 4,854.35 0.04 2.20 0.00 1,632 4,854.34 0.04 2.25 0.00 1,625 4,854.34 0.04 2.30 0.00 1,618 4,854.33 0.04 2.35 0.00 1,610 4,854.32 0.04 2.40 0.00 1,603 4,854.31 0.04 2.45 0.00 1,596 4,854.31 0.04 2.50 0.00 1,589 4,854.30 0.04 2.55 0.00 1,582 4,854.29 0.04 Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: POND (continued) Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 2.60 0.00 1,574 4,854.29 0.04 2.65 0.00 1,567 4,854.28 0.04 2.70 0.00 1,560 4,854.27 0.04 2.75 0.00 1,553 4,854.27 0.04 2.80 0.00 1,546 4,854.26 0.04 2.85 0.00 1,538 4,854.25 0.04 2.90 0.00 1,531 4,854.24 0.04 2.95 0.00 1,524 4,854.24 0.04 3.00 0.00 1,517 4,854.23 0.04 3.05 0.00 1,510 4,854.22 0.04 3.10 0.00 1,502 4,854.21 0.04 3.15 0.00 1,495 4,854.21 0.04 3.20 0.00 1,488 4,854.20 0.04 3.25 0.00 1,481 4,854.19 0.04 3.30 0.00 1,474 4,854.18 0.04 3.35 0.00 1,466 4,854.18 0.04 3.40 0.00 1,459 4,854.17 0.04 3.45 0.00 1,452 4,854.16 0.04 3.50 0.00 1,445 4,854.15 0.04 3.55 0.00 1,438 4,854.15 0.04 3.60 0.00 1,430 4,854.14 0.04 3.65 0.00 1,423 4,854.13 0.04 3.70 0.00 1,416 4,854.12 0.04 3.75 0.00 1,409 4,854.11 0.04 3.80 0.00 1,402 4,854.11 0.04 3.85 0.00 1,394 4,854.10 0.04 3.90 0.00 1,387 4,854.09 0.04 3.95 0.00 1,380 4,854.08 0.04 4.00 0.00 1,373 4,854.08 0.04 4.05 0.00 1,366 4,854.07 0.04 4.10 0.00 1,358 4,854.06 0.04 4.15 0.00 1,351 4,854.05 0.04 4.20 0.00 1,344 4,854.05 0.04 4.25 0.00 1,337 4,854.04 0.04 4.30 0.00 1,330 4,854.03 0.04 4.35 0.00 1,322 4,854.02 0.04 4.40 0.00 1,315 4,854.02 0.04 4.45 0.00 1,308 4,854.01 0.04 4.50 0.00 1,301 4,854.00 0.04 4.55 0.00 1,294 4,853.99 0.04 4.60 0.00 1,286 4,853.98 0.04 4.65 0.00 1,279 4,853.97 0.04 4.70 0.00 1,272 4,853.97 0.04 4.75 0.00 1,265 4,853.96 0.04 4.80 0.00 1,258 4,853.95 0.04 4.85 0.00 1,250 4,853.94 0.04 4.90 0.00 1,243 4,853.93 0.04 4.95 0.00 1,236 4,853.92 0.04 5.00 0.00 1,229 4,853.91 0.04 5.05 0.00 1,222 4,853.91 0.04 5.10 0.00 1,214 4,853.90 0.04 5.15 0.00 1,207 4,853.89 0.04 Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: POND (continued) Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 5.20 0.00 1,200 4,853.88 0.04 5.25 0.00 1,193 4,853.87 0.04 5.30 0.00 1,186 4,853.86 0.04 5.35 0.00 1,178 4,853.86 0.04 5.40 0.00 1,171 4,853.85 0.04 5.45 0.00 1,164 4,853.84 0.04 5.50 0.00 1,157 4,853.83 0.04 5.55 0.00 1,150 4,853.82 0.04 5.60 0.00 1,142 4,853.81 0.04 5.65 0.00 1,135 4,853.80 0.04 5.70 0.00 1,128 4,853.80 0.04 5.75 0.00 1,121 4,853.79 0.04 5.80 0.00 1,114 4,853.78 0.04 5.85 0.00 1,106 4,853.77 0.04 5.90 0.00 1,099 4,853.76 0.04 5.95 0.00 1,092 4,853.75 0.04 6.00 0.00 1,085 4,853.74 0.04 6.05 0.00 1,078 4,853.74 0.04 6.10 0.00 1,070 4,853.73 0.04 6.15 0.00 1,063 4,853.72 0.04 6.20 0.00 1,056 4,853.71 0.04 6.25 0.00 1,049 4,853.70 0.04 6.30 0.00 1,042 4,853.69 0.04 6.35 0.00 1,034 4,853.68 0.04 6.40 0.00 1,027 4,853.67 0.04 6.45 0.00 1,020 4,853.66 0.04 6.50 0.00 1,013 4,853.65 0.04 6.55 0.00 1,006 4,853.64 0.04 6.60 0.00 998 4,853.63 0.04 6.65 0.00 991 4,853.62 0.04 6.70 0.00 984 4,853.61 0.04 6.75 0.00 977 4,853.60 0.04 6.80 0.00 970 4,853.59 0.04 6.85 0.00 962 4,853.58 0.04 6.90 0.00 955 4,853.57 0.04 6.95 0.00 948 4,853.57 0.04 7.00 0.00 941 4,853.56 0.04 7.05 0.00 934 4,853.55 0.04 7.10 0.00 926 4,853.54 0.04 7.15 0.00 919 4,853.53 0.04 7.20 0.00 912 4,853.52 0.04 7.25 0.00 905 4,853.51 0.04 7.30 0.00 898 4,853.50 0.04 7.35 0.00 890 4,853.49 0.04 7.40 0.00 883 4,853.48 0.04 7.45 0.00 876 4,853.47 0.04 7.50 0.00 869 4,853.46 0.04 7.55 0.00 862 4,853.45 0.04 7.60 0.00 854 4,853.44 0.04 7.65 0.00 847 4,853.43 0.04 7.70 0.00 840 4,853.41 0.04 7.75 0.00 833 4,853.40 0.04 Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: POND (continued) Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 7.80 0.00 826 4,853.39 0.04 7.85 0.00 818 4,853.38 0.04 7.90 0.00 811 4,853.37 0.04 7.95 0.00 804 4,853.36 0.04 8.00 0.00 797 4,853.35 0.04 8.05 0.00 790 4,853.34 0.04 8.10 0.00 782 4,853.33 0.04 8.15 0.00 775 4,853.32 0.04 8.20 0.00 768 4,853.31 0.04 8.25 0.00 761 4,853.30 0.04 8.30 0.00 754 4,853.29 0.04 8.35 0.00 746 4,853.28 0.04 8.40 0.00 739 4,853.27 0.04 8.45 0.00 732 4,853.26 0.04 8.50 0.00 725 4,853.24 0.04 8.55 0.00 718 4,853.23 0.04 8.60 0.00 710 4,853.22 0.04 8.65 0.00 703 4,853.21 0.04 8.70 0.00 696 4,853.20 0.04 8.75 0.00 689 4,853.19 0.04 8.80 0.00 682 4,853.17 0.04 8.85 0.00 674 4,853.16 0.04 8.90 0.00 667 4,853.15 0.04 8.95 0.00 660 4,853.14 0.04 9.00 0.00 653 4,853.13 0.04 9.05 0.00 646 4,853.11 0.04 9.10 0.00 638 4,853.10 0.04 9.15 0.00 631 4,853.09 0.04 9.20 0.00 624 4,853.08 0.04 9.25 0.00 617 4,853.07 0.04 9.30 0.00 610 4,853.06 0.04 9.35 0.00 602 4,853.04 0.04 9.40 0.00 595 4,853.03 0.04 9.45 0.00 588 4,853.02 0.04 9.50 0.00 581 4,853.01 0.04 9.55 0.00 574 4,853.00 0.04 9.60 0.00 566 4,852.98 0.04 9.65 0.00 559 4,852.97 0.04 9.70 0.00 552 4,852.96 0.04 9.75 0.00 545 4,852.94 0.04 9.80 0.00 538 4,852.93 0.04 9.85 0.00 530 4,852.91 0.04 9.90 0.00 523 4,852.90 0.04 9.95 0.00 516 4,852.89 0.04 10.00 0.00 509 4,852.87 0.04 10.05 0.00 502 4,852.86 0.04 10.10 0.00 494 4,852.85 0.04 10.15 0.00 487 4,852.83 0.04 10.20 0.00 480 4,852.82 0.04 10.25 0.00 473 4,852.81 0.04 10.30 0.00 466 4,852.79 0.04 10.35 0.00 458 4,852.78 0.04 Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: POND (continued) Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 10.40 0.00 451 4,852.77 0.04 10.45 0.00 444 4,852.75 0.04 10.50 0.00 437 4,852.74 0.04 10.55 0.00 430 4,852.72 0.04 10.60 0.00 422 4,852.71 0.04 10.65 0.00 415 4,852.69 0.04 10.70 0.00 408 4,852.68 0.04 10.75 0.00 401 4,852.66 0.04 10.80 0.00 394 4,852.65 0.04 10.85 0.00 386 4,852.63 0.04 10.90 0.00 379 4,852.62 0.04 10.95 0.00 372 4,852.60 0.04 11.00 0.00 365 4,852.59 0.04 11.05 0.00 358 4,852.57 0.04 11.10 0.00 350 4,852.55 0.04 11.15 0.00 343 4,852.54 0.04 11.20 0.00 336 4,852.52 0.04 11.25 0.00 329 4,852.51 0.04 11.30 0.00 322 4,852.49 0.04 11.35 0.00 314 4,852.47 0.04 11.40 0.00 307 4,852.46 0.04 11.45 0.00 300 4,852.44 0.04 11.50 0.00 293 4,852.42 0.04 11.55 0.00 286 4,852.40 0.04 11.60 0.00 278 4,852.39 0.04 11.65 0.00 271 4,852.37 0.04 11.70 0.00 264 4,852.35 0.04 11.75 0.00 257 4,852.33 0.04 11.80 0.00 250 4,852.32 0.04 11.85 0.00 242 4,852.30 0.04 11.90 0.00 235 4,852.28 0.04 11.95 0.00 228 4,852.26 0.04 12.00 0.00 221 4,852.24 0.04 12.05 0.00 214 4,852.22 0.04 12.10 0.00 206 4,852.20 0.04 12.15 0.00 199 4,852.18 0.04 12.20 0.00 192 4,852.16 0.04 12.25 0.00 185 4,852.14 0.04 12.30 0.00 178 4,852.12 0.04 12.35 0.00 170 4,852.10 0.04 12.40 0.00 163 4,852.08 0.04 12.45 0.00 156 4,852.06 0.04 12.50 0.00 149 4,852.04 0.04 12.55 0.00 142 4,852.02 0.04 12.60 0.00 134 4,851.99 0.04 12.65 0.00 127 4,851.97 0.04 12.70 0.00 120 4,851.95 0.04 12.75 0.00 113 4,851.92 0.04 12.80 0.00 106 4,851.90 0.04 12.85 0.00 98 4,851.87 0.04 12.90 0.00 91 4,851.85 0.04 12.95 0.00 84 4,851.82 0.04 Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: POND (continued) Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 13.00 0.00 77 4,851.80 0.04 13.05 0.00 70 4,851.78 0.04 13.10 0.00 62 4,851.75 0.04 13.15 0.00 55 4,851.72 0.04 13.20 0.00 48 4,851.69 0.04 13.25 0.00 41 4,851.66 0.04 13.30 0.00 34 4,851.64 0.04 13.35 0.00 26 4,851.61 0.04 13.40 0.00 19 4,851.58 0.04 13.45 0.00 12 4,851.55 0.04 13.50 0.00 6 4,851.52 0.03 13.55 0.00 2 4,851.51 0.01 13.60 0.00 1 4,851.50 0.00 13.65 0.00 0 4,851.50 0.00 13.70 0.00 0 4,851.50 0.00 13.75 0.00 0 4,851.50 0.00 13.80 0.00 0 4,851.50 0.00 13.85 0.00 0 4,851.50 0.00 13.90 0.00 0 4,851.50 0.00 13.95 0.00 0 4,851.50 0.00 14.00 0.00 0 4,851.50 0.00 14.05 0.00 0 4,851.50 0.00 14.10 0.00 0 4,851.50 0.00 14.15 0.00 0 4,851.50 0.00 14.20 0.00 0 4,851.50 0.00 14.25 0.00 0 4,851.50 0.00 14.30 0.00 0 4,851.50 0.00 14.35 0.00 0 4,851.50 0.00 14.40 0.00 0 4,851.50 0.00 14.45 0.00 0 4,851.50 0.00 14.50 0.00 0 4,851.50 0.00 14.55 0.00 0 4,851.50 0.00 14.60 0.00 0 4,851.50 0.00 14.65 0.00 0 4,851.50 0.00 14.70 0.00 0 4,851.50 0.00 14.75 0.00 0 4,851.50 0.00 14.80 0.00 0 4,851.50 0.00 14.85 0.00 0 4,851.50 0.00 14.90 0.00 0 4,851.50 0.00 14.95 0.00 0 4,851.50 0.00 15.00 0.00 0 4,851.50 0.00 15.05 0.00 0 4,851.50 0.00 15.10 0.00 0 4,851.50 0.00 15.15 0.00 0 4,851.50 0.00 15.20 0.00 0 4,851.50 0.00 15.25 0.00 0 4,851.50 0.00 15.30 0.00 0 4,851.50 0.00 15.35 0.00 0 4,851.50 0.00 15.40 0.00 0 4,851.50 0.00 15.45 0.00 0 4,851.50 0.00 15.50 0.00 0 4,851.50 0.00 15.55 0.00 0 4,851.50 0.00 Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: POND Elevation (feet) Storage (cubic-feet) 4,851.50 0 4,851.55 12 4,851.60 25 4,851.65 37 4,851.70 50 4,851.75 62 4,851.80 77 4,851.85 92 4,851.90 106 4,851.95 121 4,852.00 136 4,852.05 153 4,852.10 171 4,852.15 188 4,852.20 206 4,852.25 223 4,852.30 243 4,852.35 264 4,852.40 284 4,852.45 305 4,852.50 325 4,852.55 348 4,852.60 372 4,852.65 395 4,852.70 419 4,852.75 442 4,852.80 469 4,852.85 496 4,852.90 522 4,852.95 549 4,853.00 576 4,853.05 606 4,853.10 637 4,853.15 667 4,853.20 698 4,853.25 728 4,853.30 762 4,853.35 796 4,853.40 830 4,853.45 864 4,853.50 898 4,853.55 936 4,853.60 974 4,853.65 1,013 4,853.70 1,051 4,853.75 1,089 4,853.80 1,131 4,853.85 1,174 4,853.90 1,216 4,853.95 1,259 4,854.00 1,301 4,854.05 1,348 Elevation (feet) Storage (cubic-feet) 4,854.10 1,395 4,854.15 1,442 4,854.20 1,489 4,854.25 1,536 4,854.30 1,588 4,854.35 1,640 4,854.40 1,691 4,854.45 1,743 4,854.50 1,795 4,854.55 1,852 4,854.60 1,909 4,854.65 1,966 4,854.70 2,023 4,854.75 2,080 4,854.80 2,143 4,854.85 2,206 4,854.90 2,268 4,854.95 2,331 4,855.00 2,394 Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: POND Elevation (feet) Discarded (cfs) 4,851.50 0.00 4,851.51 0.04 4,851.52 0.04 4,851.53 0.04 4,851.54 0.04 4,851.55 0.04 4,851.56 0.04 4,851.57 0.04 4,851.58 0.04 4,851.59 0.04 4,851.60 0.04 4,851.61 0.04 4,851.62 0.04 4,851.63 0.04 4,851.64 0.04 4,851.65 0.04 4,851.66 0.04 4,851.67 0.04 4,851.68 0.04 4,851.69 0.04 4,851.70 0.04 4,851.71 0.04 4,851.72 0.04 4,851.73 0.04 4,851.74 0.04 4,851.75 0.04 4,851.76 0.04 4,851.77 0.04 4,851.78 0.04 4,851.79 0.04 4,851.80 0.04 4,851.81 0.04 4,851.82 0.04 4,851.83 0.04 4,851.84 0.04 4,851.85 0.04 4,851.86 0.04 4,851.87 0.04 4,851.88 0.04 4,851.89 0.04 4,851.90 0.04 4,851.91 0.04 4,851.92 0.04 4,851.93 0.04 4,851.94 0.04 4,851.95 0.04 4,851.96 0.04 4,851.97 0.04 4,851.98 0.04 4,851.99 0.04 4,852.00 0.04 4,852.01 0.04 Elevation (feet) Discarded (cfs) 4,852.02 0.04 4,852.03 0.04 4,852.04 0.04 4,852.05 0.04 4,852.06 0.04 4,852.07 0.04 4,852.08 0.04 4,852.09 0.04 4,852.10 0.04 4,852.11 0.04 4,852.12 0.04 4,852.13 0.04 4,852.14 0.04 4,852.15 0.04 4,852.16 0.04 4,852.17 0.04 4,852.18 0.04 4,852.19 0.04 4,852.20 0.04 4,852.21 0.04 4,852.22 0.04 4,852.23 0.04 4,852.24 0.04 4,852.25 0.04 4,852.26 0.04 4,852.27 0.04 4,852.28 0.04 4,852.29 0.04 4,852.30 0.04 4,852.31 0.04 4,852.32 0.04 4,852.33 0.04 4,852.34 0.04 4,852.35 0.04 4,852.36 0.04 4,852.37 0.04 4,852.38 0.04 4,852.39 0.04 4,852.40 0.04 4,852.41 0.04 4,852.42 0.04 4,852.43 0.04 4,852.44 0.04 4,852.45 0.04 4,852.46 0.04 4,852.47 0.04 4,852.48 0.04 4,852.49 0.04 4,852.50 0.04 4,852.51 0.04 4,852.52 0.04 4,852.53 0.04 Elevation (feet) Discarded (cfs) 4,852.54 0.04 4,852.55 0.04 4,852.56 0.04 4,852.57 0.04 4,852.58 0.04 4,852.59 0.04 4,852.60 0.04 4,852.61 0.04 4,852.62 0.04 4,852.63 0.04 4,852.64 0.04 4,852.65 0.04 4,852.66 0.04 4,852.67 0.04 4,852.68 0.04 4,852.69 0.04 4,852.70 0.04 4,852.71 0.04 4,852.72 0.04 4,852.73 0.04 4,852.74 0.04 4,852.75 0.04 4,852.76 0.04 4,852.77 0.04 4,852.78 0.04 4,852.79 0.04 4,852.80 0.04 4,852.81 0.04 4,852.82 0.04 4,852.83 0.04 4,852.84 0.04 4,852.85 0.04 4,852.86 0.04 4,852.87 0.04 4,852.88 0.04 4,852.89 0.04 4,852.90 0.04 4,852.91 0.04 4,852.92 0.04 4,852.93 0.04 4,852.94 0.04 4,852.95 0.04 4,852.96 0.04 4,852.97 0.04 4,852.98 0.04 4,852.99 0.04 4,853.00 0.04 4,853.01 0.04 4,853.02 0.04 4,853.03 0.04 4,853.04 0.04 4,853.05 0.04 Elevation (feet) Discarded (cfs) 4,853.06 0.04 4,853.07 0.04 4,853.08 0.04 4,853.09 0.04 4,853.10 0.04 4,853.11 0.04 4,853.12 0.04 4,853.13 0.04 4,853.14 0.04 4,853.15 0.04 4,853.16 0.04 4,853.17 0.04 4,853.18 0.04 4,853.19 0.04 4,853.20 0.04 4,853.21 0.04 4,853.22 0.04 4,853.23 0.04 4,853.24 0.04 4,853.25 0.04 4,853.26 0.04 4,853.27 0.04 4,853.28 0.04 4,853.29 0.04 4,853.30 0.04 4,853.31 0.04 4,853.32 0.04 4,853.33 0.04 4,853.34 0.04 4,853.35 0.04 4,853.36 0.04 4,853.37 0.04 4,853.38 0.04 4,853.39 0.04 4,853.40 0.04 4,853.41 0.04 4,853.42 0.04 4,853.43 0.04 4,853.44 0.04 4,853.45 0.04 4,853.46 0.04 4,853.47 0.04 4,853.48 0.04 4,853.49 0.04 4,853.50 0.04 4,853.51 0.04 4,853.52 0.04 4,853.53 0.04 4,853.54 0.04 4,853.55 0.04 4,853.56 0.04 4,853.57 0.04 Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/31/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: POND (continued) Elevation (feet) Discarded (cfs) 4,853.58 0.04 4,853.59 0.04 4,853.60 0.04 4,853.61 0.04 4,853.62 0.04 4,853.63 0.04 4,853.64 0.04 4,853.65 0.04 4,853.66 0.04 4,853.67 0.04 4,853.68 0.04 4,853.69 0.04 4,853.70 0.04 4,853.71 0.04 4,853.72 0.04 4,853.73 0.04 4,853.74 0.04 4,853.75 0.04 4,853.76 0.04 4,853.77 0.04 4,853.78 0.04 4,853.79 0.04 4,853.80 0.04 4,853.81 0.04 4,853.82 0.04 4,853.83 0.04 4,853.84 0.04 4,853.85 0.04 4,853.86 0.04 4,853.87 0.04 4,853.88 0.04 4,853.89 0.04 4,853.90 0.04 4,853.91 0.04 4,853.92 0.04 4,853.93 0.04 4,853.94 0.04 4,853.95 0.04 4,853.96 0.04 4,853.97 0.04 4,853.98 0.04 4,853.99 0.04 4,854.00 0.04 4,854.01 0.04 4,854.02 0.04 4,854.03 0.04 4,854.04 0.04 4,854.05 0.04 4,854.06 0.04 4,854.07 0.04 4,854.08 0.04 4,854.09 0.04 Elevation (feet) Discarded (cfs) 4,854.10 0.04 4,854.11 0.04 4,854.12 0.04 4,854.13 0.04 4,854.14 0.04 4,854.15 0.04 4,854.16 0.04 4,854.17 0.04 4,854.18 0.04 4,854.19 0.04 4,854.20 0.04 4,854.21 0.04 4,854.22 0.04 4,854.23 0.04 4,854.24 0.04 4,854.25 0.04 4,854.26 0.04 4,854.27 0.04 4,854.28 0.04 4,854.29 0.04 4,854.30 0.04 4,854.31 0.04 4,854.32 0.04 4,854.33 0.04 4,854.34 0.04 4,854.35 0.04 4,854.36 0.04 4,854.37 0.04 4,854.38 0.04 4,854.39 0.04 4,854.40 0.04 4,854.41 0.04 4,854.42 0.04 4,854.43 0.04 4,854.44 0.04 4,854.45 0.04 4,854.46 0.04 4,854.47 0.04 4,854.48 0.04 4,854.49 0.04 4,854.50 0.04 4,854.51 0.04 4,854.52 0.04 4,854.53 0.04 4,854.54 0.04 4,854.55 0.04 4,854.56 0.04 4,854.57 0.04 4,854.58 0.04 4,854.59 0.04 4,854.60 0.04 4,854.61 0.04 Elevation (feet) Discarded (cfs) 4,854.62 0.04 4,854.63 0.04 4,854.64 0.04 4,854.65 0.04 4,854.66 0.04 4,854.67 0.04 4,854.68 0.04 4,854.69 0.04 4,854.70 0.04 4,854.71 0.04 4,854.72 0.04 4,854.73 0.04 4,854.74 0.04 4,854.75 0.04 4,854.76 0.04 4,854.77 0.04 4,854.78 0.04 4,854.79 0.04 4,854.80 0.04 4,854.81 0.04 4,854.82 0.04 4,854.83 0.04 4,854.84 0.04 4,854.85 0.04 4,854.86 0.04 4,854.87 0.04 4,854.88 0.04 4,854.89 0.04 4,854.90 0.04 4,854.91 0.04 4,854.92 0.04 4,854.93 0.04 4,854.94 0.04 4,854.95 0.04 4,854.96 0.04 4,854.97 0.04 4,854.98 0.04 4,854.99 0.04 4,855.00 0.04 Sample C 1-hr 25-yr, 1-hr Rainfall=0.90"22674 Storm Calcs Printed 8/21/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Summary for Pond 2P: SWALE Inflow Area = 3,919 sf,100.00% Impervious, Inflow Depth = 0.69" for 25-yr, 1-hr event Inflow = 0.16 cfs @ 0.45 hrs, Volume= 227 cf Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0 cf, Atten= 100%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 4,854.92' @ 1.05 hrs Surf.Area= 840 sf Storage= 227 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume Invert Avail.Storage Storage Description #1 4,854.50' 955 cf 1.00'W x 235.00'L x 1.00'H Prismatoid Z=3.0 The geotechnical report notes the infiltration rate was measured at less than 2 in/hr for the sandy lean clay, and although the pond will drain with a low infiltration rate, the facility was sized conservatively with no infiltration rate to fully capture the runoff from the southern half of the road. Sample C 1-hr 25-yr, 1-hr Rainfall=0.90"22674 Storm Calcs Printed 8/21/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Pond 2P: SWALE Inflow Hydrograph Time (hours)2423222120191817161514131211109876543210 Fl o w ( c f s ) 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=3,919 sf Peak Elev=4,854.92' Storage=227 cf 0.16 cfs Sample C 1-hr 25-yr, 1-hr Rainfall=0.90"22674 Storm Calcs Printed 8/21/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Hydrograph for Pond 2P: SWALE Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) 0.00 0.00 0 4,854.50 0.05 0.00 0 4,854.50 0.10 0.00 0 4,854.50 0.15 0.00 0 4,854.50 0.20 0.02 2 4,854.51 0.25 0.05 9 4,854.53 0.30 0.09 21 4,854.57 0.35 0.13 41 4,854.63 0.40 0.15 66 4,854.68 0.45 0.16 94 4,854.73 0.50 0.15 121 4,854.78 0.55 0.14 147 4,854.82 0.60 0.11 170 4,854.85 0.65 0.09 187 4,854.87 0.70 0.07 201 4,854.89 0.75 0.05 213 4,854.91 0.80 0.03 220 4,854.92 0.85 0.01 224 4,854.92 0.90 0.01 225 4,854.92 0.95 0.00 226 4,854.92 1.00 0.00 227 4,854.92 1.05 0.00 227 4,854.92 1.10 0.00 227 4,854.92 1.15 0.00 227 4,854.92 1.20 0.00 227 4,854.92 1.25 0.00 227 4,854.92 1.30 0.00 227 4,854.92 1.35 0.00 227 4,854.92 1.40 0.00 227 4,854.92 1.45 0.00 227 4,854.92 1.50 0.00 227 4,854.92 Sample C 1-hr 25-yr, 1-hr Rainfall=0.90"22674 Storm Calcs Printed 8/21/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 2P: SWALE Elevation (feet) Storage (cubic-feet) 4,854.50 0 4,854.51 2 4,854.52 5 4,854.53 8 4,854.54 11 4,854.55 14 4,854.56 17 4,854.57 20 4,854.58 23 4,854.59 27 4,854.60 31 4,854.61 34 4,854.62 38 4,854.63 43 4,854.64 47 4,854.65 51 4,854.66 56 4,854.67 60 4,854.68 65 4,854.69 70 4,854.70 75 4,854.71 81 4,854.72 86 4,854.73 92 4,854.74 97 4,854.75 103 4,854.76 109 4,854.77 115 4,854.78 122 4,854.79 128 4,854.80 135 4,854.81 141 4,854.82 148 4,854.83 155 4,854.84 162 4,854.85 169 4,854.86 177 4,854.87 184 4,854.88 192 4,854.89 200 4,854.90 208 4,854.91 216 4,854.92 224 4,854.93 233 4,854.94 241 4,854.95 250 4,854.96 259 4,854.97 268 4,854.98 277 4,854.99 287 4,855.00 296 4,855.01 306 Elevation (feet) Storage (cubic-feet) 4,855.02 315 4,855.03 325 4,855.04 335 4,855.05 345 4,855.06 356 4,855.07 366 4,855.08 377 4,855.09 388 4,855.10 398 4,855.11 410 4,855.12 421 4,855.13 432 4,855.14 444 4,855.15 455 4,855.16 467 4,855.17 479 4,855.18 491 4,855.19 503 4,855.20 516 4,855.21 528 4,855.22 541 4,855.23 554 4,855.24 566 4,855.25 580 4,855.26 593 4,855.27 606 4,855.28 620 4,855.29 633 4,855.30 647 4,855.31 661 4,855.32 675 4,855.33 690 4,855.34 704 4,855.35 719 4,855.36 733 4,855.37 748 4,855.38 763 4,855.39 778 4,855.40 794 4,855.41 809 4,855.42 825 4,855.43 841 4,855.44 856 4,855.45 873 4,855.46 889 4,855.47 905 4,855.48 922 4,855.49 938 4,855.50 955 Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/21/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Summary for Pond 2P: SWALE Inflow Area = 3,919 sf,100.00% Impervious, Inflow Depth = 1.03" for 100-yr, 1-hr event Inflow = 0.23 cfs @ 0.44 hrs, Volume= 338 cf Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0 cf, Atten= 100%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 4,855.04' @ 1.05 hrs Surf.Area= 1,014 sf Storage= 338 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume Invert Avail.Storage Storage Description #1 4,854.50' 955 cf 1.00'W x 235.00'L x 1.00'H Prismatoid Z=3.0 The geotechnical report notes the infiltration rate was measured at less than 2 in/hr for the sandy lean clay, and although the pond will drain with a low infiltration rate, the facility was sized conservatively with no infiltration rate to fully capture the runoff from the southern half of the road. Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/21/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Pond 2P: SWALE Inflow Hydrograph Time (hours)2423222120191817161514131211109876543210 Fl o w ( c f s ) 0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=3,919 sf Peak Elev=4,855.04' Storage=338 cf 0.23 cfs Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/21/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Hydrograph for Pond 2P: SWALE Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) 0.00 0.00 0 4,854.50 0.05 0.00 0 4,854.50 0.10 0.00 0 4,854.50 0.15 0.01 1 4,854.50 0.20 0.04 6 4,854.52 0.25 0.09 18 4,854.56 0.30 0.14 39 4,854.62 0.35 0.20 70 4,854.69 0.40 0.22 108 4,854.76 0.45 0.23 148 4,854.82 0.50 0.21 188 4,854.87 0.55 0.20 225 4,854.92 0.60 0.16 257 4,854.96 0.65 0.12 282 4,854.99 0.70 0.10 302 4,855.01 0.75 0.08 318 4,855.02 0.80 0.04 329 4,855.03 0.85 0.01 334 4,855.04 0.90 0.01 336 4,855.04 0.95 0.01 337 4,855.04 1.00 0.00 338 4,855.04 1.05 0.00 338 4,855.04 1.10 0.00 338 4,855.04 1.15 0.00 338 4,855.04 1.20 0.00 338 4,855.04 1.25 0.00 338 4,855.04 1.30 0.00 338 4,855.04 1.35 0.00 338 4,855.04 1.40 0.00 338 4,855.04 1.45 0.00 338 4,855.04 1.50 0.00 338 4,855.04 Sample C 1-hr 100-yr, 1-hr Rainfall=1.25"22674 Storm Calcs Printed 8/21/2023Prepared by {enter your company name here} HydroCAD® 10.00-22 s/n 10544 © 2018 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 2P: SWALE Elevation (feet) Storage (cubic-feet) 4,854.50 0 4,854.51 2 4,854.52 5 4,854.53 8 4,854.54 11 4,854.55 14 4,854.56 17 4,854.57 20 4,854.58 23 4,854.59 27 4,854.60 31 4,854.61 34 4,854.62 38 4,854.63 43 4,854.64 47 4,854.65 51 4,854.66 56 4,854.67 60 4,854.68 65 4,854.69 70 4,854.70 75 4,854.71 81 4,854.72 86 4,854.73 92 4,854.74 97 4,854.75 103 4,854.76 109 4,854.77 115 4,854.78 122 4,854.79 128 4,854.80 135 4,854.81 141 4,854.82 148 4,854.83 155 4,854.84 162 4,854.85 169 4,854.86 177 4,854.87 184 4,854.88 192 4,854.89 200 4,854.90 208 4,854.91 216 4,854.92 224 4,854.93 233 4,854.94 241 4,854.95 250 4,854.96 259 4,854.97 268 4,854.98 277 4,854.99 287 4,855.00 296 4,855.01 306 Elevation (feet) Storage (cubic-feet) 4,855.02 315 4,855.03 325 4,855.04 335 4,855.05 345 4,855.06 356 4,855.07 366 4,855.08 377 4,855.09 388 4,855.10 398 4,855.11 410 4,855.12 421 4,855.13 432 4,855.14 444 4,855.15 455 4,855.16 467 4,855.17 479 4,855.18 491 4,855.19 503 4,855.20 516 4,855.21 528 4,855.22 541 4,855.23 554 4,855.24 566 4,855.25 580 4,855.26 593 4,855.27 606 4,855.28 620 4,855.29 633 4,855.30 647 4,855.31 661 4,855.32 675 4,855.33 690 4,855.34 704 4,855.35 719 4,855.36 733 4,855.37 748 4,855.38 763 4,855.39 778 4,855.40 794 4,855.41 809 4,855.42 825 4,855.43 841 4,855.44 856 4,855.45 873 4,855.46 889 4,855.47 905 4,855.48 922 4,855.49 938 4,855.50 955 Appendix D