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Velocity Coefficient

thread162-86896

Velocity Coefficient

Velocity Coefficient

(OP)
I am looking for a ref. on culvert analysis with approach velocity.  Specifically the cofficient for velocity to reduce the velocity head from the ponded headwater of the culvert.  Hope you can help me, my co-worker and I have been looking through many sources and havent had any luck yet.

RE: Velocity Coefficient

Can you tweak the contraction coefficient?  If it is a pond with negligible velocity into the culvert you could set the contraction coefficient high, like 0.9 or 1.0 (worst case).  

A reference could be the Hec-RAS Hydraulics Reference Manual available at:

http://www.hec.usace.army.mil/software/hec-ras/documents/hydref/index.html

Chapter 3 has contraction coefficients (p. 3-20)

FHWA has software to analyze culverts, if needed.
http://www.fhwa.dot.gov/bridge/hydsoft.htm

Hope this helps,


BLT


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