It sounds like to me you are designing an underground detention / infiltration system if you have a positive outflow downstream controlled by a weir. Are you sure you need to be seperated from the SHW table by three feet? The NJ BMP only requires a 2' seperation from an infiltration basin, I...
I contacted Intellisolve and technical support indicated changing the shape factor does the job. We are working in southern new jersey which requires the use of the Del UH and utilizatio of the Type III 24-hr rainfall distribution.
Thanks
That is the problem, I am utilizing the SCS Type III Hydrograph, altering the shape factor to 285 from the 484 but am not certain that this is correctly utilizing the delmarva unit hydrograph.
Thanks for you thought, I am going to give them a call tomorrow.
I am using the 2004 vs. of Hydraflow and was wondering how you enter the delmarva unit hydrograph into the program. Does anyone have the .cds file type for this or experience with it?