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Coefficient of spillway

Hi all, i am currently trying to input a spillway into the model, but do not know how to get the values of the empirical coefficient. the spillway is 5.4m above the datum where the water elevation is at 4.8m. do i need to consider all the 4 coefficients? and how do i derive the values? thks with regards, george[addsig]
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George I tried to give you some guidance in the User Manual to estimate these - but the best is to obtian the rating curve from the construction drawings of the spillway - then use this as the rating curve. If that is not available, you should be able to guesstimate. Scott[addsig]