I have a site with a dry detention basin with an infiltration trench in the bottom. I have modeled this with two storage elements: one for the infiltration trench portion (elevation 916 to 922) and the second above the infiltration (elevation 922 to 925). The surface area of the trench is...
When working on a development in/along a Zone A area, I’ll use HEC-RAS to determine base flood elevations for my site. For some reason, almost every site like this that I work on includes an upstream reach of the Zone A area.
My question is: how do you determine where the upstream limit of...