Posted by Jerry/MT on July 04, 2011 at 11:26:21 from (206.183.116.129):
In Reply to: garden irrigation posted by Mark on July 04, 2011 at 10:35:54:
How quickly do you want to water it and how much water do you want to put on. 16000 gallons is 4960 cu ft. On a half acre of ground, that"s ~ 2.7 inches of water if you pump the cistern dry and distibute it over the entire half acre.
Aluminum handlines with sprinlers will put out ( for example, 5/32" nozzle @40"psi will put out~ 4.6 gpm and with 40ftx40 ft spacing), will put out about 0.28 inches of water per hour. Knowing the dimensions of your garden, figure out how many 40 ft pipes will go lengthe wise on your garden and how many 40 ft widths will gover the garden.Thet will determine the number of sprinkler heads you"ll need and how may moves you"ll have to make. The number of heads, the pressure at the nozzles and the nozzle size will size your pump flow rate. The pump pressure will have to be higher than the pressure of the nozzle to account for line pressure losses in the delivery system. So that pressure, the flowrate and the pump efficiency will size the motor. That"s a synopsis on how I would approach your problem.
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