Enter the precipitation depth (in), the watershed area (acres), and the runoff coefficient (Rv) into the Water Quality Volume Calculator. The calculator will evaluate the Water Quality Volume.

## Water Quality Volume Formula

The following formula is used to calculate the Water Quality Volume.

**WQV = P * A * Rv**

Variables:

- WQV is the Water Quality Volume (acre-inch)
- P is the precipitation depth (in)
- A is the watershed area (acres)
- Rv is the runoff coefficient (Rv)

## How to Calculate Water Quality Volume?

The following steps outline how to calculate the Water Quality Volume.

- First, determine the precipitation depth (in).
- Next, determine the watershed area (acres).
- Next, determine the runoff coefficient (Rv).
- Next, gather the formula from above = WQV = P * A * Rv.
- Finally, calculate the Water Quality Volume.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following variables as an example problem to test your knowledge.

precipitation depth (in) = .9

watershed area (acres) = 30

runoff coefficient (Rv) = .50

WQV = P * A * Rv =** ** ?