Question Background: I'm working on a rectangular parcel that is bounded on the north and west sides by existing washes. A regional drainage study (HEC-1) has defined the peak flows associated with a 24-hr, 100-yr storm for the area. The existing washes are not large enough to convey these flows and the 24-hr, 100-yr flows would overtop their banks.
As part of our development, the local municipality requires that we install drainage channels in place of these washes to convey the 2-hr, 100-yr flows.
Hydrology Question:
I have peak flows based on a 24-hr storm. Is there an acceptable voodo-based way to directly reduce these flows to reflect a 2-hr duration storm?
OR...
Should I obtain the HEC-1 model and re-run it with 2-hr, 100-yr rainfall (is this even possible as it's a non-SCS type storm)?
Thanks for your insight/replies!
As part of our development, the local municipality requires that we install drainage channels in place of these washes to convey the 2-hr, 100-yr flows.
Hydrology Question:
I have peak flows based on a 24-hr storm. Is there an acceptable voodo-based way to directly reduce these flows to reflect a 2-hr duration storm?
OR...
Should I obtain the HEC-1 model and re-run it with 2-hr, 100-yr rainfall (is this even possible as it's a non-SCS type storm)?
Thanks for your insight/replies!