How many inches 30 minutes of watering delivers depends on sprinkler type, water pressure, and system design, but average estimates are that standard spray sprinkler delivers about 1 to 1.5 inches per hour, so 30 minutes gives about 0.5 to 0.75 inches. Rotor sprinkler delivers about 0.3 to 0.5 inches per hour, so 30 minutes gives 0.15 to 0.25 inches. Oscillating sprinkler may deliver 0.2 to 0.4 inches in 30 minutes. Drip system delivers slowly, maybe 0.1 to 0.3 inches in 30 minutes. To know exact amount, you can do tuna can test by placing empty tuna cans around lawn, running sprinklers 15 minutes, measuring depth with ruler, and doubling for 30 minutes. For example, if can collects 0.25 inch in 15 minutes, then 30 minutes gives 0.5 inch. Most lawns need 1 to 1.5 inches per week, so you may need to water 30 minutes 2 to 3 times per week depending on sprinkler output to reach that total.
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