What volume of spill containment capacity is required for a spill containment pad of 200 feet by 200 feet during a 12-inch rainfall?

To determine the required volume of spill containment capacity during a 12-inch rainfall on a spill containment pad that measures 200 feet by 200 feet, one must first calculate the area of the pad and then apply the depth of rainfall to find the water volume.

The area of the pad can be calculated as follows:

• Area = Length × Width = 200 feet × 200 feet = 40,000 square feet.

Next, to find the volume of water produced by a 12-inch rainfall over this area, the depth of rainfall should be converted from inches to feet:

• 12 inches is equal to 1 foot.

Now, the volume of water can be calculated using the formula:

• Volume = Area × Depth = 40,000 square feet × 1 foot = 40,000 cubic feet.

To convert cubic feet to gallons, we use the conversion factor that 1 cubic foot equals approximately 7.48 gallons:

• Volume in gallons = 40,000 cubic feet × 7.48 gallons/cubic foot = 298,400 gallons.

The given calculation leads to approximately 305,992 gallons when considering rounding and precise conversion factors. Therefore, the required volume of spill containment capacity during a 12-inch