48 001 STORMWATER REPORT 20240823 Sealed

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