A water agency stated that waterlines cannot have water flowing faster than 8 ft/s. What is the minimum standard pipe diameter that can transport 1750 gal/min without exceeding this limit?

The minimum standard diameter is 0.787 ft

Explanation:

Speed = 8 ft/s

Volumetric flow rate = 1750 gal/min = 1750 gal/min * 1 ft^3/7.481 gal * 1 min/60 s = 3.899 ft^3/s

Area of pipe (A) = volumetric flow rate : speed = 3.899 ft^3/s : 8 ft/s = 0.487 ft^2

Diameter of pipe = sqrt (4A/π) = sqrt (4*0.487/3.142) = sqrt (0.61999) = 0.787 ft