facts, opinions, hard data and some WAGs welcome. . .

Discussion in 'Pumps and Tanks Well Forum & Blog' started by Thatguy, Oct 9, 2010.

  1. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    For resi. wells, what percent of drillers get a usable well on the first attempt?

    What is the lifetime of a resi. well?

    If your working well is 200' deep and your neighbor has a working well, how shallow or how deep is it likely to be?

    Thanks, folks. . .
  2. nhmaster3015

    nhmaster3015 Master Plumber

    Messages:
    836
    Location:
    The granite state
    Around here I would say about 90% + on hitting water, first time. Thats what they pay the geologist the big bucks for.

    Depends on where you live

    Depends on the aquifir depth
  3. justwater

    justwater Well Drilling/Service

    Messages:
    327
    Location:
    FL/GA
    my area of NE FL is 100% chance, go deep enough and you will hit water. usually 2-3 different zones here you can pull from. we normally get wells from 40-160' (rock well), 200-380' (intermediate well- "salt&pepper"), 480-700' (artesian) .. just depends on what type of water they want and how much they wanna spend. but just because there is an abundance of water doesnt mean NE FL drilling is easy, we have to fight with "cave-ins", sand, bad clay, shell, gravel, etc.. .. on top of the fact that we are mostly low-land, so its always muddy and nasty, and hot.

    here most close neighbors will have same well depths within 10' or so. although there are those few places we have drilled wells within 50' and they be totally different in terms of rock formations and well volume. i've even drilled a 100' rock well at one house, then there be no rock at his neighbors and have to go 260' to get to the next zone. can sometimes vary alot in a short distance.. the key is knowing where these uncertain areas are.

    thats what makes well drilling so unique.. changes so much from area to area. any pinhead can work hard and operate equipment, but if you dont have enough experience to know what to expect here and there within your area, and how to prepare for it, you will have a very tough road as a new well driller starting out. running the equipment is the easy part.

    a pvc well here that is drilled correctly "should" be the last well you ever need..
    Last edited: Oct 9, 2010
  4. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    Thanks, guys, that is exactly what I'm looking for.

    With 90% chance [0.9] of hitting it the first time, with two wells you go to 1-(0.1^2) = 0.99 = 99% chance. Based on this I'd say if the driller can't hit it with two wells there's something seriously wrong or his number came up.

    My impression was that it was a lot more iffy.
  5. masterpumpman

    masterpumpman New Member

    Messages:
    729
    Location:
    Virginia Beach, VA
    It depends on the area of Maryland. Around Frederick I know some have drilled six and more holes to 200 feet and more and got no water. Depth required is where you find water. Find a reputable licensed and hopefully NGWA Certified Driller and good luck!
  6. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    Approx. what percent of drillers have such an experience?

    What's the rule of thumb for when to call it quits?
  7. valveman

    valveman Moderator Staff Member

    Messages:
    4,588
    Location:
    Lubbock, Texas
    Some areas in our part of the country have 100% chance of finding water. I can even tell you almost exactly how deep the well will be. In other areas it can be 50/50. And in some areas it is less than 5% chance. As justwater and Porky said, the experience to know where these areas are is key. There are more well records available than there use to be, which helps. But there is still no substitute for a driller’s experience.
  8. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    I e-mailed these guys
    http://www.ngwa.org/
    we'll see what they say.

    But, in addition, can anyone recommend textbooks on the subject of residential well drilling?
    In a search of the whole MD library system I only got one hit, and that is dubious.
    Possibly the local community college has a tech. bookstore and they may have something.
  9. justwater

    justwater Well Drilling/Service

    Messages:
    327
    Location:
    FL/GA
    Ngwa should probably be able to point u toward literature on fundamentals of well drilling in different parts of the US, but I'd guess it would be hard to find much past that.

    In my experience, well drillers aren't really known for their generosity in sharing information of drilling methods/techniques.
    Last edited: Oct 10, 2010
Similar Threads: facts opinions
Forum Title Date
Pumps and Tanks Well Forum & Blog 3X question, any opinions or help greatly appreciated Feb 1, 2012
Pumps and Tanks Well Forum & Blog Any opinions on the Constant Pressure Systems Aug 10, 2011
Pumps and Tanks Well Forum & Blog Opinions on Grundfos 10S05-9 to replace a Goulds 10GS05 Aug 9, 2011
Pumps and Tanks Well Forum & Blog Best PVC Cleaner, Primer, Glue, All Opinions Welcomed Jul 12, 2011
Pumps and Tanks Well Forum & Blog Any recommendations or opinions on poly pipe to use on a long haul Jul 8, 2011

Share This Page