Sump Pump Help

Discussion in 'Pumps and Wells' started by Sunho Choi, Nov 10, 2019.

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  1. Nov 15, 2019 #21

    Jeff Handy

    Jeff Handy

    Jeff Handy

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    It sounds like his 1/3 hp pump, being discharged through a skinny garden hose, is pumping out the pit much faster than his 1 hp pump.

    I assume his main discharge is at least 1-1/2 pipe.
    So it sounds like there is likely a defect in the discharge line.
    Which is something I tried to bring up earlier.

    Just last weekend, I rodded out a buried 3 inch discharge line that tended to freeze and clog during the polar vortex weather.
    Even though it was set up to drain to daylight and not hold water.
    A pipe joint near the end had blown apart, the rubber coupling had rotted and failed, and water was just bubbling up through the dirt, not from the end of the drain that seemed clear and open.

    Or his check valve is defective, or maybe the spring flapper is broken loose inside.
     
  2. Nov 15, 2019 #22

    Sunho Choi

    Sunho Choi

    Sunho Choi

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    So if I'm calculating correctly, my inflow rate is 3.8 gpm. My pumped rate would be 7.6 gpm or maybe a little more?
    My total elevation head which I previously thought was 9-10ft, should be that + 40ft since it runs horizontally about 40ft before the pipe drops down at the downspout line.

    Would those numbers make sense? Also the pipe size is 1.5"

    I guess I just want to make sure my set up is working properly and there is no underlying issue that is affecting the performance.
    Also I don't quite understand where the proper water level should be.
    For example why is the water streaming into the pit from the inlet?
    Is it ALL from water from the last rain that is trying to drain?
    Is it that my water table is higher and I'm just trying to pump water from the water table?

    And finally, I know you don't want me to compare, but I still don't understand how a 1/3 hp pump using a hose which is less than half the diameter of a pvc pipe can pump water out faster than a 1hp with a larger diameter. They both have to go up the same height, but one just travels horizontally about twice the distance.
     
  3. Nov 15, 2019 #23

    Sunho Choi

    Sunho Choi

    Sunho Choi

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    I have some exciting news to report! I called rotorooter and had them come out this afternoon. They snaked the gutter line going to the creek and also the sump discharge line that connects to the gutter line. Plugged my sump back in and now it pumps out the water in a hurry! WOW what a difference. Looks like I should be cleaning out these discharge lines once every so often since I have so much iron ochre here. My next step will be getting a hi/lo switch so that I can adjust the run time to be longer as to not short cycle the pump.

    Thanks Jeff and DieHard for helping me through this!
     
  4. Nov 15, 2019 #24

    Diehard

    Diehard

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    Glad to hear you found the "root" of your problem.
    As Jeff had speculated.
     
  5. Nov 15, 2019 #25

    Jeff Handy

    Jeff Handy

    Jeff Handy

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    I will put on my “clogs” and do a little happy dance, haha.

    But seriously, if the sump is sharing a drain with the house gutters, that line could be choking up with leaves, and also leaves that rot and turn into muddy compost up in the gutters.

    So keep the gutters clean, and also you can install a filter.
    Either up in the gutter, just before the downspout, or right at the bottom of the downspout just before it dumps into the drain line to the creek.
    You can find these on Google.
    They let water through, but they hold back sticks and leaves.
    Some of them need regular cleaning, and other types are at least partially self cleaning.
     
  6. Nov 16, 2019 #26

    Diehard

    Diehard

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    I never envisioned a very tight connection between a 1-1/2" pipe and a gutter downspout.
     
  7. Nov 16, 2019 #27

    Jeff Handy

    Jeff Handy

    Jeff Handy

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    Not sure what that means.

    But a tight connection would not be needed, if everything runs away freely by gravity, unrestricted.

    I assume the 1-1/2 inch sump discharge joins up to a larger drain which also accepts the downspout.

    But my point was to try to keep leaf debris from entering and clogging the shared drain, which drains both the downspout and sump discharge out to the creek.
     
  8. Nov 16, 2019 #28

    Diehard

    Diehard

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    No, I'm just saying when the OP was describing the pumps discharge piping arrangement, I was trying to obtain the TDH( Total Dynamic Head).
    He mentioned "it left the house, angled down and connected to the gutter drain spout where it connected to an underground pipe that runs about 60ft to a storm water creek." So when I heard this description, while I'm trying to figure out the exact hydraulics affecting the pumps performance, I made the assumption(wrong apparently) that the connection to the gutter drain spout was the end of the force main(Or the hydraulic calcs.).
    I wasn't thinking that it may be all backed up due to blockage and so on. I was still thinking about the hydraulics and never really got that far.

    My problem is, I used to engineer pumping and piping systems and like to get into the detail stuff.:Do_O
     
  9. Nov 16, 2019 #29

    Jeff Handy

    Jeff Handy

    Jeff Handy

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    Yes, I understand.

    Once you have the discharge flowing downhill, and entering a larger pipe, you would rightly think that it would basically be like just dumping on the ground at that point.
    No more pipe friction or back pressure to worry about from that point on.

    I tend to think of more doom and gloom scenarios, outside the box as they say.
     
  10. Nov 16, 2019 #30

    Diehard

    Diehard

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    Yes....Also referred to as EXPERIENCE!:thumbsup:
     

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