A water main is to be laid from a water tower to a subdivision that is 2 miles away. The water level in the tower is $150 \mathrm{ft}$ above the ground. The main must supply a maximum of $1000 \mathrm{gpm}$ with a minimum of $5 \mathrm{psig}$ at the discharge end, at a temperature of $65^{\circ} \mathrm{F}$. What size commercial steel sch 40 pipe should be used for the water main? If plastic pipe (which is hydraulically smooth) were used instead, would this alter the result? If so, what diameter of plastic pipe should be used?