All the municipalities that I work in have adopted a new common Stormwater Management Ordinance that was pushed upon them by our State's DEP. One of the requirements for using the Rational Method is to have the length of the ascending leg of the hydrograph equal to 3 times Tc and the descending leg length 7 times Tc. I'm having trouble modeling this in HydroCAD in a way that is acceptable to the reviewers. I have set my duration to 3 Tc and my rate of rise as 3 and rate of fall as 7. The reviewer is not accepting this because the Intensity used to calculate the peak of the hydrograph in not the Intensity for the Tc but the Intensity for the duration (3xTc). Setting duration to equal Tc and keeping the rise/fall at 3/7 doesn't work either. Is there a way to force HydroCAD to use the Intensity and therefore the peak Q that is associated with the Tc but have that peak occur at 3xTc and have the descending leg 7xTc? Thanks!
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