Skip to Content.
Sympa Menu

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

market-farming AT lists.ibiblio.org

Subject: Market Farming

List archive

Chronological Thread  
  • From: Barking Cat Farm <barkingcatfarm AT mindspring.com>
  • To: Market Farming <market-farming AT lists.ibiblio.org>
  • Subject: Re: [Market-farming] Drip irrigation/irrigation
  • Date: Thu, 3 Jun 2010 14:55:06 -0500

Thanks Farmer Justin for finding the error.  Of course 300X12X12 = 43,200 si (not 4,320, missed a zero), which as you pointed out is 187 gallons.  At 40GPH, that would take a little over 4.5 hours to water to get one inch.

Hmmm…now I need to go back and check the calculations I did when we first put in our drip tape and set up the watering times, because we don't water anywhere _near_ 4.5 hours each week per 300' bed, and our crops do just fine.  In fact, we water twice a week for less than an hour, and sometimes the beds are still a bit too wet to get around in hours later.  We've been doing that for years, and the crops do fine with it, rain or not, plastic mulch or not.

Anyway, thanks for finding the error.  Looks like I've got another farm puzzle to solve.

Laurie
BCF

On Jun 3, 2010, at 12:01 PMJun/3/10, Farmer Justin wrote:

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 .


_______________________________________________
Market-farming mailing list
Market-farming AT lists.ibiblio.org
http://lists.ibiblio.org/mailman/listinfo/market-farming

Market Farming List Archives may be found here:
https://lists.ibiblio.org/sympa/arc/market-farming/
Unsubscribe from the list here (you will need to login in with your email
address and password):
http://lists.ibiblio.org/mailman/options/market-farming




Archive powered by MHonArc 2.6.24.

Top of Page