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Author: Subject: HOW TO (DRIP or SPRINKLER) IRRIGATE your Baja garden
MitchMan
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[*] posted on 8-7-2013 at 05:11 PM


I just finished some calculations and 5.5 psi is what I came up with. It is probably less due to friction in the lines. The significant point is that it is no where near 20 lbs. Read some reviews on Amazon and those that gave it a poor rating had it on much higher water pressure. The fact that my water pressure is low is probably why it has lasted and performed so well.

No sure about anything for sure, but I do know that it has worked for two years non stop.
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David K
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[*] posted on 8-7-2013 at 06:58 PM


Well, keep the reports coming in. The way I calculate pressure is the per foot PSI change of 0.433. So Every 10 feet of drop you gain 4.33 PSI of pressure. You lose the same amount of pressure if you go up.

"for 26 minutes. Not sure, but I think this supplies about 26 gallons total at each watering. "

This means you are flowing '1 gallon per minute' (60 gallons per hour, in drip talk)... so 60 '1 gph' emitters or 30 '2 gph' emitters at design pressure (15 psi usually for non-compensating emitters). 5.5 psi would mean less water coming out, however.




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MitchMan
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[*] posted on 8-7-2013 at 08:04 PM


DK,
Yeah, I haven't been able to measure it objectively. My estimate is a pure estimate. The actual way I came up with 26 gallons per 26 minute is by having measured the number of inches the water level dropped in the Tinaco before and after the 26 minutes of watering and calculating that volume of water.

Also, having repeatedly witnessed a stream of water that measured a pour rate of 1 gallon of water and removing an end cap at the farthest plant and looking at that stream...as a "reasonableness" test...I think that I am in the approximate neighborhood. But, it's all still a guess.

I connect my 3/4" hose to 1/2" irrigation tubing using makeshift adapters, split it off to supply several different plants using "Ts" and then I push on a white plastic end cap/plug at the end of the tube terminating at each plant. The way I control the flow to each plant is by drilling different sized holes in the end cap/plug (e.g., 5/64", 6/64" and 7/64") and sometimes put more than one hole in certain caps.

The trick is to balance how much water gets to each plant during the 26 minutes of watering. That was a real task as variables such as size and number of holes in the end cap, distance from the valve, relative elevations of each plant and the needs of the plant for water depending on size, type and nature of the plant. Big, big balancing act. But, I did it. Lots of trial and error.

I did it all on the cheap...because I AM cheap. It has been fun and it is certainly worth it.

[Edited on 8-8-2013 by MitchMan]
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David K
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[*] posted on 8-8-2013 at 08:10 AM


Good job!!!



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David K
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[*] posted on 3-28-2017 at 10:03 AM


Received some emailed drip questions from long time Nomad and Amigo de Baja, Bedman... Bumping up this thread for his ease to find.



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Doug/Vamonos
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[*] posted on 4-17-2017 at 06:01 AM


fyi. I did a simple drip system at christmas time for a mix of palms, plumerias, and bougainvillea in pots. It features an 1100 liter pila on my roof at 11 feet, feeding 3/4" pvc to a battery timer mounted to the side of the garage. The outlet is also 3/4" pvc which goes down to the plants and I simply drilled about an 1/8" hole over every plant and water drips to them. Set the timer every other day for ten minutes and the plants look fine when I visited a couple weeks ago. It was a temporary system in December just to keep the plants alive till I return with enough time to really set it up. I used about 1/2 tank of water over three months. Kind of fun. The city water guys work in my office and they calc'd it at about 6psi with that much fall.

[Edited on 4-17-2017 by Doug/Vamonos]
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[*] posted on 4-17-2017 at 10:11 PM


fyi. I did a simple drip system at christmas time for a mix of palms, plumerias, and other plants in pots. It features an 1100 liter pila on my roof at 11 feet, feeding 3/4" pvc to a battery timer mounted to the side of the garage. The outlet is also 3/4" pvc which goes down to the plants and I simply drilled about an 1/8" hole over every plant and water drips to them. Set the timer every other day for ten minutes and the plants look fine when I visited a couple weeks ago. It was a temporary system in December just to keep the plants alive till I return with enough time to really set it up. I used about 1/2 tank of water over three months. Kind of fun. The city water guys work in my office and they calc'd it at about 6psi with that much fall.
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