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HW/D Maximum Values

HW/D Maximum Values

HW/D Maximum Values

(OP)
I recently reviewed a local municipalities (near Denver) drainage standards and was a little surprised to see the following statement as it applies to inlet control for culverts under roads:

"The maximum allowable headwater for the 100-year design flows will be 1.5 time the culvert diameter.  Also, headwater depth may be limited by the street overtopping..."

Does anyone know the reasoning behind limiting the HW/D to such a "small" amount?  I don't design small culverts with huge amounts of head, just to "shove" the storm conveyance through, but also limiting the HW/D to 1.5 seems way too conservative, particularly for a 100-year storm event.

Any opinions would be appreciated.

RE: HW/D Maximum Values

(OP)
Sorry, looks like I put this in the wrong section - my post has been relocated to Storm/Flood Engineering...

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