(Solved): Using the Darcy-Weisbach equation, determine the best pipe diameter to use for a 1 mile long, cast ...

Using the Darcy-Weisbach equation, determine the best pipe diameter to use for a 1 mile long, cast iron pipe for a flow of $$1.25\mathrm{cfs}$$ while maintaining a maximum headloss of $$35\mathrm{ft}$$. Temp $$=60^{?}\mathrm{F}$$. Available pipe sizes (in inches): $$3,6,8,12,15,18$$. Must try at least three sizes to show that you have the best size. ( 3 points)