Prev Previous Post   Next Post Next
Old 11-21-2012, 07:04 PM
Darryl G Darryl G is offline
LawnSite Fanatic
Join Date: May 2001
Posts: 8,038
Backflow Preventer Questions

Hi guys. I'm wondering if you guys could answer some questions about backflow preventers for me. I'm not an irrigation guy, and this is actually related to volunteer efforts on my part to try to solve a mystery for a local municipality. They are getting fecal coliform contamination in a well at their athletic complex as an ongoing problem. The well provides water for their snack bar and water fountains as well as their irrigation system. It's a drilled bedrock well, so I think it unlikely that the groundwater in the area is contaminated, although it is posslbe.

Possible sources of the contamination that I have identified are:

1) Surface water leaking into the well head (someone is inspecting the well for me today to let me know if it's flush with grade or elevated)
2) A bad well seal around the well casing allowing water to flow around the outside of the casing, and
3) Possible backflow from their irrigation system

This field does get a lot of geese on it, and I'm thinking that perhaps they're getting backflow from the irrigation system into the well. So what exactly is a backflow preventer? Is it like a check valve? Do they fail sometimes (I would imagine so)? How does one typically test one? Is there usually just one on a system or multiple?

I have no idea what their irrigation setup is and it's not likely I'll have that information readily available. I guess I just want to know a little more about backflow preventers and if it's possible that a failed one (or lack of one for that matter) could be causing surface water to flow back into the well.

Thanks in advance.


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Layout Style:

Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Grand View Media
All times are GMT -4. The time now is 12:14 PM.

Page generated in 0.21784 seconds with 9 queries