Which of the following equations represents the d/s profile of "ogee" spillway with vertical u/s face? (x, y) are the coordinates of the point on the d/s profile with origin at the crest of the spillway and Hd is the design head.
1
\(\frac{Y}{H_d}=-0.5\left(\frac{X}{H_d}\right)^{1.85}\)
2
\(\frac{Y}{H_d}=-0.5\left(\frac{X}{H_d}\right)^{\frac{1}{1.85}}\)
3
\(\frac{Y}{H_d}=-2.0\left(\frac{X}{H_d}\right)^{1.85}\)
4
\(\frac{Y}{H_d}=-2.0\left(\frac{X}{H_d}\right)^{\frac{1}{1.85}}\)