C  x  W  x  .052

         HR                = Sprinkler Minutes

C - coverage area 

W - water depth

.052 - (it takes 52 gallons per 1,000 sq feet to soak an area 1 inch deep)

HR - Hose rate (gallons per minute coming out of your hose)

Sprinkler time - How long you should run your sprinkler in minutes

 

This is a general equation to help calculate the amount of time needed to get the desired coverage.