Instead of driving and looking at how much water comes out. The better method is to start the sprayer with only water. Then with a measuring cup and a stop watch go to a nozzle and collect the water from it for 30 sec. Then you can figure out how much you are spraying total by multiplying the measurement by the number of tips and by 2 (to get the amount per minute). Then you can figure out what speed needed to get 18 gpa. Say you have 20 nozzles and 30 foot coverage and got 12.8 oz. in 30 seconds from one nozzle (just making up numbers). That means in 1 minute you pump out 512 oz. or 4 gallons.
That means you need to cover one acre in 4.5 minutes. Then you use the formula of Width * MPH * 5280 / 43560 = acres/hr. This example would be 30*X*5280/43560=13.3 (To cover an acre in 4.5 minutes you need to cover 13.3 acres per hour, 60/4.5) with the "X" being the unknown. That then changes to X=13.3*43560/5280/30. It then works out to 3.65 MPH.
Obviously the example is not a practical one as I had either the number of tips too high or the oz. per 30 sec. from one tip too much.
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