Advice on wells/pumps

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

  1. mns

    mns New Member

    Joined:
    Oct 17, 2011
    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

    Joined:
    Feb 6, 2011
    Occupation:
    Information Technology
    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?
     
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  4. Gary in NJ

    Gary in NJ New Member

    Joined:
    Apr 11, 2010
    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.
     
  5. mns

    mns New Member

    Joined:
    Oct 17, 2011
    Location:
    VA
    One recommended constant pressure for this situation and another recommended conventional... which is confusing. What are the parameters we should be considering?
     
  6. mns

    mns New Member

    Joined:
    Oct 17, 2011
    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?
     
  7. mns

    mns New Member

    Joined:
    Oct 17, 2011
    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?
     
  8. valveman

    valveman Moderator Staff Member

    Joined:
    Mar 15, 2006
    Occupation:
    Pump Controls Technician
    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.
     
  9. valveman

    valveman Moderator Staff Member

    Joined:
    Mar 15, 2006
    Occupation:
    Pump Controls Technician
    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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