A siphon spillway (Figure P8.8.5) with a cross-sectional area of 12 ft2 is used to discharge water to a downstream reservoir 60 ft below the crest of the spillway. If the upstream reservoir level is 7.5 ft above the intake, what is the pressure head at the crest if the siphon has been primed Assume the frictional head Joss is equal to twice the velocity head and is evenly distribute throughout its length. The entrance and exit loss coefficients are 0.5 and 1.0, respectively, and the siphon crest is one-fourth the total length from the entrance. Also determine whether cavitation is a concern if the water temperature is 68°F.