Re: Recommendations for new sprinkler system?
The city where I live requires a backflow prevention device on the line between the water meter and the zone valves. They also require that the device be tested annually.
There are two types that are approved for use here: atmospheric vacuum breakers which are mounted above ground, or double check valves which can be mounted in an underground valve box.
Where you live they may not be required but, if your sprinklers are supplied by a potable water system, it's a "must have" item to protect your health. Without the backflow prevention a busted water main, a maintenance shutoff, or a failure of a well pump can create a negative pressure (vacuum) situation and suck contaminated water back into the potable lines from the sprinkler system. This is a "bad thing."
Last edited by Fencepost; 05-31-2009 at 01:19 AM.
Reason: Removed excess commas.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.