When calculating headwater of a culvert does the size upstream basin within the roadside ditch come into play? As an example, if you have 5cfs of flow into 12" culvert and you calculate that the headwater would be 1ft above the crown of pipe. Would this 1ft calculation differ if you have a 10% ditch slope coming into the culvert vs a 0.5% ditch slope? With the 10% it would seem like the upstream basin would be almost non existent and the inflow to the culvert would inundate this area to a depth greater then the 1ft above crown.
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