I was hoping for some guidance on how to model stormwater flow through a stone trench in HydroCAD. What I have is a gravel access road which was constructed across the end of a field without a roadside ditch. The property owner is complaining about flows from the road causing erosion in his field. There isn't enough space within the r/w to construct a full ditch but I was thinking I could construct a stone trench along the road which would discharge to the culverts. I'm just not sure how to model that. Any thoughts?
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