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Using lake water @ high volume

Discussion in 'Irrigation' started by Greenie, Mar 11, 2002.

  1. Greenie

    Greenie LawnSite Member
    Messages: 105

    We water a 50K sq. ft. lawn using a ditch pump (50GPM) pumping lake water through 1 1/2" fire hose. Is there a sprinkler on a high tripod that we could hook the 1 1/2" hose to? This way we could set the sprinkler, let it run for 20 minutes or so, then move it.
    The application is a beach, we have about 2 hours early in the morning to get the lawn watered before the crowds arrive.
    Thanks in advance for any help.
  2. HBFOXJr

    HBFOXJr LawnSite Bronze Member
    Messages: 1,712

    What is a "ditch pump" and what psi does it produce at 50 GPM.

    How far are you pumping?

    How many days per week can you water?

    Where are you located?
  3. Greenie

    Greenie LawnSite Member
    Messages: 105


    I'm not sure of the pressure, it isn't awfully high - maybe 20 psi. There should be enough pressure to run a simple sprinkler.The lift is less than 8 feet, approximately 150 feet of line from the pump ( 1 1/2 canvas fire hose ). The pump is a gas powered ditch pump, made by Carter - about 30 years old with a new engine. We usually water only when rainfall is lacking before the lawn starts slowing any stress. We can water every day, but there is a lot of other works that needs to be done. Setting up the pump and line takes time, plus one person has to stay with it.
    We are in central Maine, our current drought status is "extreme"
  4. HBFOXJr

    HBFOXJr LawnSite Bronze Member
    Messages: 1,712

    To apply 1" of water to your area would require about 31,000 gal. At 50 gpm that is 621 minutes of operating time or 10 hrs. That is assuming being able to water the whole site at one time.

    Since you only have a 14 hr window per week and you can't afford to use that because of other chores, you have a problem.

    There is nothing available that fits you pump capacity in gpm or available working pressure that will solve the problem.

    50 gpm thru 1.5" canvas hose will create a huge friction loss per 100' to further add to your dilema.

    You need a higher capacity pump and a very large head capable of something like a 100' to 125 ' radius and maybe 3" hose to make this feasible.
  5. Greenie

    Greenie LawnSite Member
    Messages: 105

    Thanks Harold,

    A larger pump & lines isn't in the cards right now. I'll water when I can. We have used the 50 GPM pump for over 20 years, just irrigating when we have a dry spell. As long as we start soon enough the lawns stay green but if we are just a little late, it's brown.

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