online_ogee_rating:   Calculation of ogee spillway rating


HD = Hd + [Va/(2g)]

β = H/HD       βi = Hi/HD       Hi = βi HD

Ei = E + Hi       Ci = (Ci/CD) CD

Qi = Ci (2g)1/2 L Hi3/2

Design Graphs



Choose SI or U.S. Customary units:

Spillway length L (m) [ft]:       

Design head (excluding Va) Hd (m) [ft]:       

Approach velocity Va (m/s) [fps]:       
[ Leave blank if you want the program to neglect the approach velocity ].

Dam height P (m) [ft]:       

Freeboard Fb (m) [ft]:       

Spillway crest elevation E (m) [ft]:       


iElevation Ei
Head Hi
Hi / HDCi / CDCiQi


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