Quote:
Originally Posted by DAVES
It is not a matter of minutes but how much water YOUR system applies in that zone per minute. Solution is simple collect several Tuna Fish type cans. Wash them. Spread them out around your lawn and measure water applied. You may well discover uneven application. Missing heads. Buried heads and improperly adjusted heads. Needed water
depends on type of grass, quality of soil.
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This ^^^^^
All GPM outputs are not the same for every system.
The cans should collect 1/2 to 3/4" per watering.