Subtraction water meter

Discussion in 'Irrigation' started by Felco #2, Jun 21, 2012.

  1. Felco #2

    Felco #2 LawnSite Member
    Messages: 41

    Hey folks. Looking at having a subtract meter installed. An obvious downside will be a pressure loss from having the second meter, but I am I missing anything else? Any tips or experiences, good or bad would be appreciated. My setup would be identical to the drawing. Current setup has one 60', 1" sch40 mainline supplying domestic and irrigation needs.

    *I am still evaluating dynamic pressures in my zones so I will have those numbers before I decide on anything. I do know that I have between 36-40 psi in my spray zones, but I don't have the right gauge to check my rotors.

    Subtract Meter.jpg
  2. greenmonster304

    greenmonster304 LawnSite Gold Member
    Messages: 3,690

    Wu can't they be in parallel instead of in series. Then you are only getting hit once.
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  3. Felco #2

    Felco #2 LawnSite Member
    Messages: 41

    Would have to pay for a new tap to the tune of $2K+. My water provider offers the subtract meter as a cheaper alternative. Just a small fee for the meter, no tap fee.
  4. Mike Leary

    Mike Leary LawnSite Fanatic
    Messages: 23,172

    Out here, we call them "deduct meters" so as to avoid the sewer surcharge. It's a damn good idea, we've been pushing it for years, but most purveyors see it as an added time for them to get away from their donuts and read an extra meter. Did you have a backflow assembly originally? The new meter and associated fittings will lower your psi, but not that much. The backflow will lose you 7-10 pounds pressure, and with your stated psi, it could be tricky.
  5. Felco #2

    Felco #2 LawnSite Member
    Messages: 41

    Same reason here, avoiding sewer charges. Wells are being punched all over the place and the provider fears losing revenue among other things. Currently have a 1" rpz so that pressure loss is already factored in.
  6. muddywater

    muddywater LawnSite Bronze Member
    Messages: 1,813

    Here the dumbass water meters never deduct them correctly, but i guess its worth the cost even if they dont get it right everytime. Another 5/8 tap here is $600 for resi.
  7. Waterlogged

    Waterlogged LawnSite Senior Member
    from Texas
    Messages: 587

    Alot of towns around here will avg. your winter months sewer charge and that is what you pay in the summer months. Others will have a separate meter that you don't pay for sewer, mostly older systems. Very few deduct meters.
  8. DanaMac

    DanaMac LawnSite Fanatic
    Messages: 13,226

    Here they figure your sewer fee based on water usage during the winter, when our system are not in use.
  9. Stuttering Stan

    Stuttering Stan LawnSite Bronze Member
    Messages: 1,504

    You all are lucky. My local sewage authority ceased allowing deduct meters about 2008. When the economy tanked, they saw deduct meters as a lost source of revenue. Wells have become very popular since then for new installs.
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  10. greenmonster304

    greenmonster304 LawnSite Gold Member
    Messages: 3,690

    Not an issue here there are no sewers.
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