Advice on wells/pumps

Discussion in 'Pumps and Tanks Well Forum & Blog' started by mns, Oct 17, 2011.

  1. mns

    mns New Member

    Messages:
    5
    Location:
    VA
    We are constructing a new home - 5 bedroom, 5.5 bath, two laundry rooms,etc. We have a well where we have a flow of 2 GPM at 700 ft. The well is 900 ft deep. We have received conflicting advice on conventional and constant pressure systems and are unable to decide how to proceed. It's a 2-acre lot so there will be a need for a sprinkler system in the future for the lawn (a portion of the lot will have a lawn).

    What would your advice be for the design of a pump/motor system for a house of this kind? The house will be about 6000 sq. ft on two levels with a finished basement of another 2000 sq. ft with a bedroom, bathroom and wet bar...

    Thanks much,
    MG
  2. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,922
    Location:
    NW Ontario, Canada
    You will need to go with two pumps and a storage tank. 2 GPM only equates to 2880 gallons a day and a 20 GPM sprinkler system can chew through that in a couple of hours.

    Determine how many gallons you will use to size the tank accordingly.

    What conflicting advice did you get on constant pressure systems?
  3. Gary in NJ

    Gary in NJ New Member

    Messages:
    90
    Location:
    NJ
    You either need a second well or a deeper well.

    What flow (and at what depth) is typical for your area? Here 50-70 gpm is found at 150 feet. I've seen well drillers use the wrong bit and go over 1,000 feet only to get 3-5 gpm.

    Ask around, your driller might be the problem.
  4. mns

    mns New Member

    Messages:
    5
    Location:
    VA
    One recommended constant pressure for this situation and another recommended conventional... which is confusing. What are the parameters we should be considering?
  5. mns

    mns New Member

    Messages:
    5
    Location:
    VA
    Can you please explain more ? What is a sufficient flow of water until which we should drill? What should I be asking the drilling contractor?
  6. mns

    mns New Member

    Messages:
    5
    Location:
    VA
    Also, what is the difference between CSV and constant pressure pump ? Which is better and why for our situation? Can someone comment, please?
  7. valveman

    valveman Moderator Staff Member

    Messages:
    4,426
    Location:
    Lubbock, Texas
    Do you know the static water level in the well? (Before you start pumping.) Can make a big difference on which pump you put in the well.
  8. valveman

    valveman Moderator Staff Member

    Messages:
    4,426
    Location:
    Lubbock, Texas
    Either way you are going to need a storage tank and booster system for the kind of flow rates you are talking about. The well can only make 2 GPM. So you have to store this water over time in a tank, (24 hours = 2880 gallons) so you can use it at higher flow rates for irrigation like (12 GPM for 4 hours).

    Below is a link to a starter explanation of the different constant pressure systems. Another link is a search for threads pertaining to just one particular brand of Variable Speed type pump systems.

    And hopefully the picture will post of a low yield well with a storage tank.


    http://www.terrylove.com/forums/sho...stant-Pressure-Pumps-Constant-Pressure-Valves

    http://www.terrylove.com/forums/search.php?searchid=1233667

    [​IMG]
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