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market-farming - Re: [Market-farming] Drip irrigation/irrigation

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  • From: Farmer Justin <tierravivafarm AT gmail.com>
  • To: market-farming AT lists.ibiblio.org
  • Subject: Re: [Market-farming] Drip irrigation/irrigation
  • Date: Thu, 3 Jun 2010 12:01:07 -0500

One inch of water on a 300 sq. ft. bed is 187 gallons, not 18.7.  Hope this prevents others from reading this and thinking "30 minutes?! Am I over-watering THAT much?"   ;)



Example: 100' long X 3' wide bed with two lines of drip tape
 - 100' X 2 = 200' of drip tape;
 - let's say we're using T1508HR, the first t-tape in the chart in that catalog page;
 - 200' of T1508HR puts out 40 gallons per hour (GPH) or .67 gallons per minute (GPM) (they include a chart so you don't have to do the math);
 - to get 1 cubic inch on 300 square feet (sf), we need 300 sf X (12 in X 12 in)/1 sf (to convert from sf to square inches (si)) = 4320 si;
 - 4320 si X 1 inch (our desired amount of water/week) = 4320 cubic inches (ci);
 - from the unit conversion website <http://www.onlineconversion.com/volume.htm>: 4,320 ci = 18.7 gallon [US, liquid];
 - to get 18.7 gallons (G) @ .67 GPM from the drip-tape, we'll need to water 18.7 G divided by 0.67 GPM = 27.9 minutes .





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