[MassChestnutOrchards] Irrigation: timer selection & hardware toadd rows

[Fred Hebard]

Yvonne,

The pressure regulator is so you get the same amount of water coming  
out of the emitters every time the system runs for a set period of  
time.  On hilly ground, you also use pressure compensating emitters,  
in addition to a regulator at the valve.  That way you can make some  
sense of the data from your soil tensiometers and adjust the timing  
appropriately.  Generally you want too keep the soil moisture deficit  
between 10 and 20 kiloPascals.  I prefer the Irrometer brand  
tensiometer, 18".

The regulator is not there to prevent bursting the tubing.

Fred


On Jun 14, 2010, at 4:34 PM, Yvonne Federowicz wrote:

> I think that the MA folks who initially purchased the hosing  
> probably checked the pressure that the tubing can take? Did Jamie  
> investigate this?  I just don't what the pressure is likely to be,  
> so I can't order the device yet.
>
> The water pressure seems to work fine and has not damaged the  
> tubing, with the exception of a slice or two from weedwhackers and  
> some suspiciously coyote-like bite marks.  I used "Gorilla Tape" on  
> the leaks about a week ago...  There is a filter.
>
> The link in my initial email goes to the Dripworks website per  
> Rudi's recommendation.  There are numerous choices...  We only have  
> one zone but need duration of several hours and ability to program  
> 1-3 waterings/week, I'd think, if the well owner agrees.
>
> http://www.dripworksusa.com/store/timerland.php?left
>
> Thanks, Yvonne
>
>
> On Mon, Jun 14, 2010 at 4:05 PM, Rudolph A Hempe <rudi20 at cox.net>  
> wrote:
> You need more than a timer--you need a pressure reducer and a  
> filter. (Drip irrigation needs no more than 30 pounds) The amount  
> of water emitted is not only dependent on the timing but also the  
> types of emitters you use (there are many different types.) Dick  
> Perreault a MG, does all our drip irrigation engineering but he is  
> stretched thin. The battery powered timers we use are from  
> Dripworks and can be programmed up to 6 zones.
> ----- Original Message -----
> From: Yvonne Federowicz
> To: masschestnutorchards at masschestnut.org
> Sent: Sunday, June 13, 2010 7:18 PM
> Subject: [MassChestnutOrchards] Irrigation: timer selection &  
> hardware toadd rows
>
> Hello folks,
>
> The irrigation system at Westerly needs  a few modifications.
>
> 1.) Expansion - we need to add 2-4 rows; the tubing is already down  
> near the Orchard, but we need the rest of the hardware that  
> connects everything.
>
> 2.) A timer - provided that the well's owner agrees, we might place  
> a timer on the system.
>
> I was examining options at a website Rudi recommended:
>
> http://www.dripworksusa.com/store/timerland.php?left
>
> Any thoughts on the battery-powered ones?
>
> I'd think that we want the "duration" to be at least 3 hours or  
> so.  Most systems appear to allow weekly or bi-weekly irrigation.
>
> However the gallons per hour are unknown.  The spigot provides a  
> fairly vigorous flow into a garden hose, normally.  Also, we'd need  
> to keep the spigot easily accessible to the well's owner.
>
> Thanks!  Yvonne
>
>
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