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Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2015 by Autodesk, Inc. v10.4 Thursday, 07 / 17 / 2014 <br />Return Intensity-Duration-Frequency Equation Coefficients (FHA) <br />Period <br />(Yrs)B D E (N/A) <br />1 12.8024 0.1000 0.5186 -------- <br />2 3.6885 0.1000 0.5191 -------- <br />3 0.0000 0.0000 0.0000 -------- <br />5 0.0000 0.0000 0.0000 -------- <br />10 5.8273 0.1000 0.5213 -------- <br />25 7.3003 0.3000 0.5269 -------- <br />50 0.0000 0.0000 0.0000 -------- <br />100 9.1805 0.1000 0.5225 -------- <br />File name: Forward IDF.IDF <br />Return Intensity Values (in/hr) <br />Period(Yrs)5 min 10 15 20 25 30 35 40 45 50 55 60 <br />1 5.50 3.86 3.13 2.70 2.41 2.19 2.02 1.89 1.78 1.68 1.60 1.53 <br />2 1.58 1.11 0.90 0.78 0.69 0.63 0.58 0.54 0.51 0.48 0.46 0.44 <br />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 <br />5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 <br />10 2.49 1.75 1.42 1.22 1.09 0.99 0.91 0.85 0.80 0.76 0.72 0.69 <br />25 3.03 2.14 1.73 1.49 1.33 1.21 1.12 1.04 0.98 0.93 0.88 0.84 <br />50 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 <br />100 3.92 2.74 2.22 1.91 1.70 1.55 1.43 1.33 1.25 1.19 1.13 1.08 <br />Tc = time in minutes. Values may exceed 60. <br />Precip. file name: C:\CRLLC\Projects\Sangeeta - Forward Landfill\forwardrainfall.pcp <br />Storm <br />Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr <br />SCS 24-hour 4.89 1.60 0.00 0.00 2.36 2.83 0.00 3.57 <br />SCS 6-Hr 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 <br />Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 <br />Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 <br />Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 <br />Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 <br />Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 <br />Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00