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Install Irrigation valve and Back flow Preventor inside the basement?

Install Irrigation valve and Back flow Preventor inside the basement?


Old 06-06-09, 12:21 PM
Thread Starter
Join Date: Aug 2005
Location: Earth
Posts: 102
Install Irrigation valve and Back flow Preventor inside the basement?

See picture below. I am looking at installing a Sprinkler system myself. It is a single zone, 5 rotor heads for 1800 Sq. feet. The quote I got from contractors range from 900 to 1000$. If I do it myself, I can buy good quality components for $400.There is no lawn as of now just a bare land. The Water main comes in to my basement through the concrete basement wall, (see picture below, it is just below the front door). The Main pipe is 2 feet below the grade outside). It is a 3/4" Copper pipe. My water meter is 60 feet from my basement, on the other end of the driveway, (See pictures – right side near the telephone box/wooden pole) so if I put the valve near the water meter, I need to bore beneath the driveway. I would like to know whether I can install the valve, Backflow Device and the controller inside the basement (of course if I get a good pressure and a GPM inside the basement) and run the irrigation pipe by drilling it out of the basement?

My county water system pressure is around 80 PSI and I am not sure the pressure at the point where I mount the Valve inside the basement. The sprinkler heads will be located at least 2 ½ feet below where I connect the valve to the water main line inside the basement because my front yard slopes down to a lower level from my basement wall. If I install the valve near Water meter, than it will be at the same level as the rotor head as you can see from the picture. Also I could avoid running the irrigation pipe from basement, so can save 40 feet of pipe and also could avoid pressure loss. The lawn will be in front of the big rock you see in the picture. appreciate your suggestions.

Rough Loss Calculations:

Backflow Preventor loss : 2 PSI
Loss due to Increase in Elevation 10 PSI (Assumption)
1” PVC Mainline Loss 1 PSI-
PGP Rotors 30 PSI
1” Class 200 Laterals Pipe Loss : 5 PSI
PGA100 Valve Loss : 3 PSI
Total Loss 51 PSI
<a href="http://s80.photobucket.com/albums/j165/SethNaga/Yard/?action=view&current=frontyard.jpg" target="_blank"><img src="http://i80.photobucket.com/albums/j165/SethNaga/Yard/frontyard.jpg" border="0" alt="Photobucket"></a>

Last edited by sethramesh; 06-06-09 at 12:44 PM.
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Old 06-08-09, 07:57 PM
Join Date: Nov 2008
Location: Michigan
Posts: 386
you can stick a backflow device in the basement so long as it is an RPZ, or double check system. They cut your PSI rating about 2x as much as a normal backflow device.

You could run some copper to the outside (close to where it enters the home) and then install a backflow device above ground and lose around 20 PSI or so. This will still be plenty of pressure should you choose to use 1" lines to feed everything.

If you google vacuum breaker and house or backflow prevention and house or words like that, you will find some examples of how people have set up their own. Your city will have guidelines on how high this must be installed and how often it has to be tested (a test you cannot do yourself). Most cities have stiff penalties for failure to comply which include shutting off your water and fines.

Boring under the driveway can be avoided if your water comes from the house instead of the oustide.

Do you get freezing temperatures where you live? If so, you will need a way to drain this all out and a plan for blowing it out in the fall.

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