A certain process requires $2\mathrm{.}3$ ft$3/$s of water to be delivered at a pressure of $30$ psi. This water comes from a large$-$diameter supply main in which the pressure remains at $60$ psi. If the galvanized iron pipe connecting the two locations is $200$ ft long and contains six threaded $90$ elbows, determine the pipe diameter. Elevation differences are negligible. SOLVE USING GOAL SEEK AND SHOW HOW TO PUT INTO GOAL SEEK!!