Assume that the contaminated water is to be used for drinking. Using principles of hydraulics, calculate the diameter of a cast iron pipe needed to...

Assume that the contaminated water is to be used for drinking. Using principles of hydraulics, calculate the diameter of a cast iron pipe needed to obtain steady uniform gravity flow of about 0.04 m3/sec given a grading of 0.5% slope. Show/explain how you obtained your answer.