$8\mathrm{.}4\mathrm{.}3$ WP SS During a heavy rainstorm, water from a parking lot completely fills an $18-$in$.-$diameter, smooth, concrete storm sewer. If the flowrate is $10f\frac{t^3}{s},$ determine the pressure drop in a $100-ft$ horizontal section of the pipe. Repeat the problem if there is a $2-ft$ change in elevation of the pipe per $100$ ft of its length.

Explain step by step and also explain with detail how you solve for f with the moody chart