48 001 STORMWATER REPORT 20240823 Sealed

24 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Wednesday, 06 / 5 / 2024 Hyd. No. 5 BASIN 2 & 3 Hydrograph type Storm frequency Time interval Inflow hyds. = Combine = 100 yrs = 1 min = 3, 4 Peak discharge Time to peak Hyd. volume Contrib. drain. area = 0.220 cfs = 722 min = 639 cuft = 0.026 ac BASIN 2 & 3 Q (cfs) Q (cfs) Hyd. No. 5 -- 100 Year 0.50 0.50 0.45 0.45 0.40 0.40 0.35 0.35 0.30 0.30 0.25 0.25 0.20 0.20 0.15 0.15 0.10 0.10 0.05 0.05 0.00 0 120 240 Hyd No. 5 360 480 600 Hyd No. 3 720 840 960 Hyd No. 4 1080 1200 1320 1440 0.00 Time (min)

25 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Wednesday, 06 / 5 / 2024 Hyd. No. 6 CHAMBERS Hydrograph type Storm frequency Time interval Inflow hyd. No. Reservoir name = Reservoir = 100 yrs = 1 min = 2 - BASIN 1 = CHAMBERS Peak discharge Time to peak Hyd. volume Max. Elevation Max. Storage = 1.893 cfs = 724 min = 6,779 cuft = 101.82 ft = 742 cuft Storage Indication method used. CHAMBERS Q (cfs) Q (cfs) Hyd. No. 6 -- 100 Year 3.00 3.00 2.00 2.00 1.00 1.00 0.00 0 120 240 Hyd No. 6 360 480 600 Hyd No. 2 720 840 960 1080 1200 Total storage used = 742 cuft 1320 1440 0.00 Time (min)

26 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Wednesday, 06 / 5 / 2024 Hyd. No. 7 TOTAL POST Hydrograph type Storm frequency Time interval Inflow hyds. = Combine = 100 yrs = 1 min = 5, 6 Peak discharge Time to peak Hyd. volume Contrib. drain. area = 2.081 cfs = 724 min = 7,418 cuft = 0.000 ac TOTAL POST Q (cfs) Q (cfs) Hyd. No. 7 -- 100 Year 3.00 3.00 2.00 2.00 1.00 1.00 0.00 0 120 240 Hyd No. 7 360 480 600 Hyd No. 5 720 840 960 Hyd No. 6 1080 1200 1320 1440 0.00 Time (min)

27 Hydraflow Rainfall Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Wednesday, 06 / 5 / 2024 Return Period Intensity-Duration-Frequency Equation Coefficients (FHA) (Yrs) B D E (N/A) 1 51.6722 12.5000 0.8924 -------- 2 56.7443 12.2000 0.8684 -------- 3 0.0000 0.0000 0.0000 -------- 5 61.1805 12.3000 0.8343 -------- 10 60.5661 11.9000 0.8001 -------- 25 52.2230 10.2000 0.7325 -------- 50 49.0956 9.5000 0.6946 -------- 100 45.0912 8.5000 0.6541 -------- File name: SampleFHA.idf Intensity = B / (Tc + D)^E Return Period (Yrs) Intensity Values (in/hr) 5 min 10 15 20 25 30 35 40 45 50 55 60 1 4.02 3.21 2.68 2.31 2.04 1.82 1.65 1.51 1.39 1.29 1.20 1.13 2 4.80 3.84 3.22 2.78 2.45 2.20 2.00 1.83 1.69 1.57 1.47 1.38 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 5.67 4.59 3.88 3.37 2.99 2.69 2.45 2.25 2.09 1.95 1.83 1.72 10 6.31 5.13 4.35 3.79 3.38 3.05 2.79 2.57 2.39 2.23 2.10 1.98 25 7.12 5.78 4.91 4.30 3.85 3.49 3.20 2.97 2.77 2.60 2.45 2.32 50 7.66 6.24 5.32 4.68 4.20 3.82 3.52 3.27 3.05 2.87 2.72 2.58 100 8.22 6.69 5.72 5.04 4.53 4.14 3.82 3.56 3.34 3.15 2.98 2.84 Tc = time in minutes. Values may exceed 60. Precip. file name: Sample.pcp Rainfall Precipitation Table (in) Storm Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 2.81 3.40 0.00 4.36 5.19 6.42 7.49 8.68 SCS 6-Hr 0.00 1.80 0.00 0.00 2.60 0.00 0.00 4.00 Huff-1st 0.00 1.55 0.00 2.75 4.94 5.38 6.50 8.00 Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Custom 0.00 1.75 0.00 2.80 3.90 5.25 6.00 7.10

Hydraflow Table of Contents Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 PRE & POST FINALLY.gpw Wednesday, 06 / 5 / 2024 Watershed Model Schematic.................................................................................. 1 2 - Year Summary Report..................................................................................................................... 2 Hydrograph Reports............................................................................................................... 3 Hydrograph No. 1, SCS Runoff, EX-1.................................................................................. 3 Hydrograph No. 2, SCS Runoff, BASIN 1............................................................................ 4 Hydrograph No. 3, SCS Runoff, BASIN 2............................................................................ 5 Hydrograph No. 4, SCS Runoff, BASIN 3............................................................................ 6 Hydrograph No. 5, Combine, BASIN 2 & 3.......................................................................... 7 Hydrograph No. 6, Reservoir, CHAMBERS......................................................................... 8 Pond Report - CHAMBERS............................................................................................. 9 Hydrograph No. 7, Combine, TOTAL POST....................................................................... 10 10 - Year Summary Report................................................................................................................... 11 Hydrograph Reports............................................................................................................. 12 Hydrograph No. 1, SCS Runoff, EX-1................................................................................ 12 Hydrograph No. 2, SCS Runoff, BASIN 1.......................................................................... 13 Hydrograph No. 3, SCS Runoff, BASIN 2.......................................................................... 14 Hydrograph No. 4, SCS Runoff, BASIN 3.......................................................................... 15 Hydrograph No. 5, Combine, BASIN 2 & 3........................................................................ 16 Hydrograph No. 6, Reservoir,

...................................................... 15 Hydrograph No. 5, Combine, BASIN 2 & 3........................................................................ 16 Hydrograph No. 6, Reservoir, CHAMBERS....................................................................... 17 Hydrograph No. 7, Combine, TOTAL POST....................................................................... 18 100 - Year Summary Report................................................................................................................... 19 Hydrograph Reports............................................................................................................. 20 Hydrograph No. 1, SCS Runoff, EX-1................................................................................ 20 Hydrograph No. 2, SCS Runoff, BASIN 1.......................................................................... 21 Hydrograph No. 3, SCS Runoff, BASIN 2.......................................................................... 22 Hydrograph No. 4, SCS Runoff, BASIN 3.......................................................................... 23 Hydrograph No. 5, Combine, BASIN 2 & 3........................................................................ 24 Hydrograph No. 6, Reservoir, CHAMBERS....................................................................... 25 Hydrograph No. 7, Combine, TOTAL POST....................................................................... 26 IDF Report.............................................................................................................. 27

EXHIBIT 2 Drainage Area Maps

PRE DEVELOPMENT DRAINAGE AREA MAP SOIL DATA S21°20 '00"W 104.98' 20.94' N S68°40 '00"E N77°11'00"W LOT 263 LOT 264 LOT 307 LOT 308 84.46' 97.52' LOT 262 S16°20'00"W BASIN 1 AREA= 0.274 AC CN= 84.8 TOC = 6.5 MIN 139.95' N11°49'00"E POST DEVELOPMENT DRAINAGE AREA MAP 4' "W 20. 9 S21°20 '00 104.98' 84.46' 97.52' LOT 262 S16°20'00"W BASIN 3 AREA= 0.00268 AC CN= 79.0 TOC = 2 MIN BASIN 1 AREA= 0.2479 AC CN= 95.9 TOC = 2 MIN S68°40 '00"E CONTAINER CONTAINER N77°11'00"W RAMP 139.95' N11°49'00"E MAIN STREET PARK DRIVE NORTH LOT 263 LOT 264 LOT 307 LOT 308 RAMP BASIN 2 AREA= 0.02333 AC CN= 88.9 TOC = 2 MIN