Toro GPM Calculation for Rainwater Catch Basin Sizing

Sizing rainwater catch basin. Toro 570 specs at 40 PSI: 3 full heads, 3 quarter heads. Got 345 GPM—seems wrong.

Correct Calculation

Example specs: 12' full = 2.5 GPM, 12' quarter = 1 GPM at 40 PSI.

10 min run = 105 gallons. 20 min = 210 gallons. Basin sized for desired run time × GPM.

Check YOUR nozzle specs (marked on nozzle: 15F, 12H, etc.) for exact GPM at your pressure.

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