$**$SOLUTION : Pc$/$y $=-37\mathrm{.}5$ ft; Yes, Cavitation will occur$**$ A siphon spillway $($Figure P$8\mathrm{.}8\mathrm{.}5)$ with a cross sectional area of $12$ ft$^2$is used to discharge water to a downstream reservoir $60$ ft below the crest of the spillway. If the upstream reservoir level is $7\mathrm{.}5$ ft above the intake, determine the pressure head at the crest if the siphon has been primed. Assume the frictional head loss is equal to twice the velocity head and is evenly distributed throughout its length. The entrance and exit loss coefficients are $0\mathrm{.}5$ and $1\mathrm{.}0,$ respectively, and the siphon crest is one forth the total length from the entrance. Also determine whether cavitation is a concern if the water temperature is $68\backslash$deg F$.$