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It is beyond the scope of this Wikipedia Page to explain the intricacies of operating HEC-RAS. For those interested in learning more, the HEC-RAS user’s manual is an excellent learning tool and the program is free to the public. It is also important to note, the example problem is a simplified situation, where minor energy losses due to expansion/contraction and the sluice gate are not taken into account. To adequately model this within the HEC-RAS modeling environment, a sluice gate constant (Cs¬) was determined and minor loss coefficients were set to zero.<br /><br />
:<math>Q = C_s*b*y_g*(2*g*H_{T,1})^{1/2}
There are three figures below illustrating the “steady flow” HEC-RAS results. The first figure is a graphical output directly from HEC-RAS, showing the surface water profile of the modeled reach. The next two figures are comparing the surface water profiles developed by HEC-RAS and the STM calculation method. There is good agreement between HEC-RAS and the STM method, except for the M3 profile just downstream of the sluice gate. While HEC-RAS can model both subcritical and supercritical flows within the same reach, the did not produce an M3 Profile in this instance. <br />
[[File:HEC-RAS Output.jpg|HEC-RAS Output]]
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