A wet well is 10 ft long and 10 ft wide. It takes 10.5 minutes to lower the well 5 ft. What is the pumping rate in GPM?

To determine the pumping rate in gallons per minute (GPM), we begin with the dimensions of the wet well and the volume of water being pumped. The wet well has a length of 10 feet and a width of 10 feet, so the area of the base is:

Area = length × width = 10 ft × 10 ft = 100 square feet.

When the water level is lowered by 5 feet, the volume of water removed is calculated as:

Volume = area × height = 100 square feet × 5 feet = 500 cubic feet.

Next, we need to convert this volume from cubic feet to gallons. There are approximately 7.48 gallons in a cubic foot, so:

Volume in gallons = 500 cubic feet × 7.48 gallons/cubic foot = 3,740 gallons.

The time taken to lower the water level is 10.5 minutes. To find the pumping rate in GPM, we divide the total volume by the time in minutes:

Pumping Rate (GPM) = Volume in gallons / Time in minutes

Pumping Rate = 3,740 gallons / 10.5 minutes ≈ 356.2 GPM.

Rounding this to the nearest whole