Need some design help with freezing/drainage

Discussion in 'Irrigation / Sprinkler Forum' started by Rossn, Apr 9, 2019.

  1. Rossn

    Rossn Member

    Joined:
    Dec 12, 2017
    Location:
    Denver, CO
    Need a little help with my irrigation valve layout and drainage and preventing freezing. I'm located in the Denver area, with frost line ~30".

    How should I lay out my two (17x23) control boxes to prevent freezing to city water supply for ouse(green line, about 33" below grade), well supply line to house (just above and parallel to the green line and about the same elevation), and manage drainage?

    #1-4 & D are maybe 14" below grade (D maybe 1" lower than the others) and based on a water test, I think they go up slightly as they head away from the pit area.

    How do I handle drainage, if I'm trying to avoid having to blow out sprinklers seasonally? Originally I thought D would be a gravity drain to the spigots, but testing with water, I think it must slope up a little first.

    In the photo I have:

    A: City water supply for BFP
    B: Downstream of BFP, where copper will drop to a el
    C: Well
    D: Blue 1" Poly leading to three seasonal spigots, each with a drain valve about 18" under ground... they are arranged so one end spigot is at the highest point, and one end spigot isat the lowest point. This area is between the first two spigots.
    X: Ignore
    1: One zone, 1" Poly
    2: One zone, 1" Poly
    3: One zone, 1" Poly
    4: One zone, 1" Poly
    5: One drip zone, 3/4" Poly
    6: One new drip zone, 1" Poly
    7: One new drip zone, 1" Poly
    8: One new drip zone, 1" Poly


    irrigation_unearthed_west.jpg
     
  2. WorthFlorida

    WorthFlorida Broad-Wing Hawk

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
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