What is the rate in gallons per square foot of 668 gallons for 1000 sq ft

Into two groups-(1) those that represent a rate of flow, as second- feet, gallons per minute, miner's inches, and discharge in second- feet per square mile, and (2) those that represent the actual quantity of water, as run-off in depth of inches, acre-feet, and millions of cubic feet. The principal terms may be defined as follows:.