You are watering your lawn with an old hose. Because lime deposits have built up over the years, the 0.75 -in.-ID. hose now has an average roughness height of \(0.022 \mathrm{in}\). One \(50-\mathrm{ft}\) length of the hose, attached to your spigot, delivers \(15 \mathrm{gpm}\) of water \(\left(60^{\circ} \mathrm{F}\right)\). Compute the pressure at the spigot, in psi. Estimate the delivery if two \(50-\mathrm{ft}\) lengths of the hose are connected. Assume that the pressure at the spigot varies with flow rate and the water main pressure remains constant at 50 psig.