Modeling amended soil swales to consider infiltration. 1

[efoltyn]

Hi folks,

I had this posted in the HydroCAD section and it was suggested that I move it to this forum as well.

In Oregon, we are using amended soil treatment swales for water quality storms to appease the regulators. I am trying to find out if anyone is using routing techniques for infiltartion in a swale with a slope, (not just a pond). These swales have to be designed to have a 9 minute travel time but generally with no more than 3-6 inches of flow depth for the water quality storm.

Is there a way to model a swale (with a longitudinal slope) and look at infiltration (and therefore a reduced runoff hydrograph). Note that the swale cannot assume a level water surface like a pond but would be some sort of "normal" depth.

Thanks,Ed

 

[bltseattle]

The HEC-HMS program allows you to route flow through a conveyance with an infiltration rate defined for the bottom surface.