Amount of Rain

The Amount of Rainfall equation solves for how much precipitation was collected over the area of a surface or what are called, "catchments". Examples of catchments this equation can be applied to are tents, parking lots, and ground.

Example:

Consider you have a roof with an area of 9290 m². Rainfall in the area is forecast at 0.113 cubic meters(m^3). Given that your roof has an efficiency of 95%. How much rain can be collected?

Answer:

Rainfall Harvest / (Roof Area * Catchment Efficiency) = Amount of Rain

0.113 m³ / (9290 m²*95%) = 1.280 E-5

Resource:

• Lancaster, Brad, and Joe Marshall. Rainwater Harvesting for Drylands. Vol. 1. Tucson, AZ: Rainsource, 2006. Print.
• "Rainwater Harvesting | Sustainability Workshop." Autodesk Sustainability Workshop. Autodesk Education Community, n.d. Web. 31 May 2015.