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  1. #1
    Bronze Member
    Join Date
    Nov 2007
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    96
    Location
    New Brunswick, Canada
    Tractor
    JD 755, Kioti DK40SE

    Default Pond dredging with a trash pump

    Hello Everyone,

    My father inlaw wants to deepen his pond and doesn't want to pay for a dragline. His pond isn't very big but has 2-3 feet of dead organic sludge on the bottom, if you step off the boat you'll be up to your waist in goop.

    Has anyone here ever tried doing this with a trash pump? Just curious if anyone has any recommendation on the pump size. I was thinking 4" minimum and maybe 6" but I see even a 4" can move a lot of water in a very short period of time.

    One issue we'd be up against is that the pond if the lowest point in the area and it's very likely we couldn't pump it far enough away to keep at least some of the sludge from running back into the pond. One solution I was thinking of was to dig a big pit away from the pond and pump everything in to it and let the heavy stuff settle out. I'd dig a ditch to drain back into the pond and lay down some straw bails with filter cloth to keep some of the finer dirt and debris that didn't settle out from getting back into the pond.

    Does anyone have an experience or wisdom they'd like to offer?

    Thanks in advance,

    Jason

  2. #2
    Super Member
    Join Date
    Mar 2008
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    9,483
    Location
    Northern Fingerlakes region of NY, USA
    Tractor
    Kubota L3830GST, B7500HST, BX2660

    Default Re: Pond dredging with a trash pump

    My grandfather dredged a bay out (many years ago) with a 3" trash pump that had a 16hp Wisconsin engine on it. He said that it worked well, but a 3" trash pump with a smaller motor that he rented a few years back didnt work at all, he spent more time cleaning it out than he did pumping. So, a smaller engine or pump is not recommended.

    Aaron Z
    A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
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  3. #3
    Gold Member
    Join Date
    Feb 2008
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    249
    Location
    Indiana
    Tractor
    GC2310

    Default Re: Pond dredging with a trash pump

    Now, I have a small pond but, used a 3" and siphoned to clean out of silt. No pump. It worked far better than expected. The pond sits about 8' above where I had the discharge. The only thing is to not get to aggressive with the silt. I had times that I had to clean out the pipe but, I removed approximalty 3' and it went pretty quick. I would think a trash pump would do far better than siphoning.

  4. #4
    Gold Member
    Join Date
    Jan 2007
    Posts
    379
    Location
    Shoreline WA, Athol ID
    Tractor
    Kubota L-35

    Default Re: Pond dredging with a trash pump

    Quote Originally Posted by unimog_jason View Post
    Hello Everyone,

    My father inlaw wants to deepen his pond and doesn't want to pay for a dragline. His pond isn't very big but has 2-3 feet of dead organic sludge on the bottom, if you step off the boat you'll be up to your waist in goop.

    Has anyone here ever tried doing this with a trash pump? Just curious if anyone has any recommendation on the pump size. I was thinking 4" minimum and maybe 6" but I see even a 4" can move a lot of water in a very short period of time.

    One issue we'd be up against is that the pond if the lowest point in the area and it's very likely we couldn't pump it far enough away to keep at least some of the sludge from running back into the pond. One solution I was thinking of was to dig a big pit away from the pond and pump everything in to it and let the heavy stuff settle out. I'd dig a ditch to drain back into the pond and lay down some straw bails with filter cloth to keep some of the finer dirt and debris that didn't settle out from getting back into the pond.

    Does anyone have an experience or wisdom they'd like to offer?

    Thanks in advance,

    Jason
    Depending on how abrasive the silt is you may find you will wear out the impeller in the pump.
    If you have a large quantity it would be better to make a siphon "Y" and use the pump to suck clean water only ( like a gold dredge).

  5. #5
    Bronze Member
    Join Date
    Nov 2007
    Posts
    96
    Location
    New Brunswick, Canada
    Tractor
    JD 755, Kioti DK40SE

    Default Re: Pond dredging with a trash pump

    The pump would be a rental unit, likely a 4" trailer mount so I wouldn't be overly concerned about the silt working on the impeller plus these pumps would be built to withstand a little abuse.

    I could see the silt being a problem if you were to try to do the job with a gas drive Chinese pump, I could see the mechanical seal being the first thing to go.

    It seems that 3" hose is big enough to do the job and the more hp you throw at the problem the quicker it will be finished. Certainly good to know these things before jumping in.

    Jason

  6. #6
    New Member GreenElephant's Avatar
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    Aug 2011
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    3
    Tractor
    Allis-Chalmers WD-45

    Default Re: Pond dredging with a trash pump

    So . . . How did this work for you?

    Jim

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