A certain process requires \(2.3 \mathrm{cfs}\) of water to be delivered at a pressure of \(30 \mathrm{psi}\). This water comes from a large-diameter supply main in which the pressure remains at \(60 \mathrm{psi}\). If the galvanized iron pipe connecting the two locations is \(200 \mathrm{ft}\) long and contains six threaded \(90^{\circ}\) elbows, determine the pipe diameter. Elevation differences are negligible.