Applied Hydraulics #$4\mathrm{.}3\mathrm{.}8.$

Three reservoirs are connected to a junction by branching pipes $($Figure P$4\mathrm{.}3\mathrm{.}2).$ An $8,000-ft-$long, $3-$ft$-$diameter pipeline carries $75\mathrm{.}0cfs$ of water from reservoir $1($elevation $3,200ft)$ to junction $J.$ Flow from the junction travels through a $2,000-$ft$-$long, $2\mathrm{.}5-$ft$-$diameter pipeline to reservoir $3($elevation $3,130ft).$ Additional flow from the junction travels through a $3,000-$ft$-$long, $2-$ft$-$diameter pipeline to reservoir $2.$ Determine the water surface elevation of reservoir $2.$ All of the pipes are made of PVC and have a Hazen$-$Williams coefficient of $150.$