Specific energy of a water flow at depth “y” and width "w" is:

1
\(E = \frac{{{Q^2}}}{{2g{w^2}{y^2}}}\)
2
\(E = \frac{{{Q^2}}}{{2g{w^2}{y^2}}} + y\)
3
\(E = \frac{{{Q^2}}}{{2g{w^2}{y^2}}} - y\)
4
\(E = \frac{{3{Q^2}}}{{2g{w^2}{y^2}}} + y\)

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