How many inches of wastewater is added to a 50-acre pond each week with a flow of 4 MGD?

To determine how many inches of wastewater are added to a 50-acre pond each week with a flow of 4 million gallons per day (MGD), the calculation begins by converting the flow rate to a weekly basis.

First, calculate the total water added to the pond each week:

1. There are 7 days in a week, so the weekly flow in gallons is:

(4 \text{ MGD} \times 7 \text{ days} = 28 \text{ million gallons per week}).

Next, convert million gallons to gallons: (28 \text{ million gallons} = 28,000,000 \text{ gallons}).

Now, convert the total gallons to cubic inches. Since 1 gallon equals 231 cubic inches, the conversion becomes: (28,000,000 \text{ gallons} \times 231 \text{ cubic inches/gallon} = 6,468,000,000 \text{ cubic inches}).

Now, determine the surface area of the pond in square inches. Since there are 43,560 square feet in an acre and 144 square inches in a square foot:

• The area of the 50-acre pond is: (50 \