remove set volume from channel for peak rates

[DShannon11]

We are working on a linear roadway where we have a few Points of Interest that have no room for traditional basins.
We have vegetated channels in the median with amended soil that allow us to take volume and water quality credit.

With that said, we are looking at ways to analyze this removed volume from a peak rate perspective. It is infiltration BUT is not constant and "forever". Once that soil is saturated, no more is take. Is there a way to remove a set volume from a subcatchment hydrograph? We fully anticipate this impacting lower storms more than higher storms.

The other issue was we were hoping to have to NOT insert each channel as a basin as there are hundreds of these channels in-between inlets. hoping for a more "macro" analysis instead of a micro "per inlet/channel" analysis.

Thanks
Dylan

 

[psmart]

With HydroCAD 10.1, you can use a link to remove a specific "Slice Volume" from the beginning of the hydrograph. This is an approximate solution, but might solve your problem. Another option would be to use the "Inflow Loss" for each reach, but this is a steady loss rate, and is not volume limited.


Peter Smart
HydroCAD Software

http://www.hydrocad.net