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#481652 - 10/26/17 10:33 AM Dam construction in a pond with a liner
PR Cooper Offline


Registered: 06/08/16
Posts: 16
Loc: Concho County, TX
I plan to build a 2.5 acre pond in an area that will very likely need to have a plastic liner. The site is in a relatively low lying area on my property near San Angelo Tx. It has a theoretical 460 acre watershed, but area has very subtle slope.

Will I still need a core trench, and clay for the dam, or can it be built up from the abundance of caliche that we will very likely find just beneath the soil? NRCS folks are coming out next week to survey the site, and tell me if it will be considered a pit or dam pond. It will actually be a combination due to the topography, but needs to be classified as one or the other according to NRCS.

Randy Cooper
Cactus Blum Ranch



Edited by PR Cooper (10/29/17 06:01 PM)

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#481664 - 10/26/17 03:26 PM Re: Dam construction in a pond with a liner [Re: PR Cooper]
BrianL Offline


Registered: 03/31/14
Posts: 695
Loc: Paris, TX
That will be one big liner.

Sorry no help on other stuff.
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#481696 - 10/27/17 07:06 AM Re: Dam construction in a pond with a liner [Re: PR Cooper]
Dave Davidson1 Offline
Moderator
Lunker

Registered: 01/04/06
Posts: 13270
Loc: Hurst & Bowie, Texas
Randy, I doubt that you will need much more than a hole in the ground. Why is the NRCS having to classify it?
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It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

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#481698 - 10/27/17 07:57 AM Re: Dam construction in a pond with a liner [Re: Dave Davidson1]
PR Cooper Offline


Registered: 06/08/16
Posts: 16
Loc: Concho County, TX
Since this is going in an area that water flows through when it rains hard, It has to do with how much water would be impounded with a dam. They said if a dam would impound more than three feet depth of water (I believe relative to the current depth of the draw) we would need a designed spillway, and the dam will need to be compacted a certain way. If less than 3 ft of water would be impounded, it would be considered a pit pond and I only need to "designate" an area for the emergency spillway, and the dam can just be fill dirt extending into the lower portion of the draw.

If I set the water level where I intend by constructing a dam, I will be impounding about 4 1/2 ft of water before any excavation.

Randy
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Randy Cooper
Cactus Blum Ranch (where the fish currently don't exist)

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#481703 - 10/27/17 09:24 AM Re: Dam construction in a pond with a liner [Re: PR Cooper]
PR Cooper Offline


Registered: 06/08/16
Posts: 16
Loc: Concho County, TX
Not sure if this works the way I think it does, but here is an attempted link to the image of my plan uploaded to image gallery. I think a found the problem and uploaded an updated image of the project too.



Edited by PR Cooper (10/27/17 10:15 PM)
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Randy Cooper
Cactus Blum Ranch (where the fish currently don't exist)

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#481713 - 10/27/17 02:42 PM Re: Dam construction in a pond with a liner [Re: PR Cooper]
John Fitzgerald Online   content


Registered: 10/27/15
Posts: 1734
Loc: S. end of Elkins, Arkansas
Thanks for fixing link.


Edited by John Fitzgerald (10/28/17 11:52 AM)
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#481735 - 10/28/17 07:06 AM Re: Dam construction in a pond with a liner [Re: PR Cooper]
Dave Davidson1 Offline
Moderator
Lunker

Registered: 01/04/06
Posts: 13270
Loc: Hurst & Bowie, Texas
I see it
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It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP

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#481810 - 10/29/17 06:05 PM Re: Dam construction in a pond with a liner [Re: PR Cooper]
PR Cooper Offline


Registered: 06/08/16
Posts: 16
Loc: Concho County, TX
This might belong in Building a Dam sub-forum...is there a way to easily change where it is posted?
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Randy Cooper
Cactus Blum Ranch (where the fish currently don't exist)

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#482520 - 11/11/17 06:31 PM Re: Dam construction in a pond with a liner [Re: PR Cooper]
esshup Offline
Moderator
Ambassador
Field Correspondent

Lunker

Registered: 01/26/09
Posts: 24021
Loc: Grovertown, Indiana
I can move it.

No matter how tall the dam is, I'd make sure it was properly compacted as if it was a dammed pond. Better to be safe than have something happen and go through all the expense to have to fix it.
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#483274 - 11/28/17 05:26 PM Re: Dam construction in a pond with a liner [Re: PR Cooper]
PR Cooper Offline


Registered: 06/08/16
Posts: 16
Loc: Concho County, TX
The NCRS released their calculations for my pond site, and show that I have a 649 acre watershed and need to accomodate 712 CFS of flow in the case of a 1% chance storm. That is going to take a pretty good size auxilliary spillway, which needs to pass under or over my dam road to be. Anybody have any formulas to share on calculating the size of culvert that could handle that.
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Randy Cooper
Cactus Blum Ranch (where the fish currently don't exist)

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#483285 - 11/28/17 07:47 PM Re: Dam construction in a pond with a liner [Re: PR Cooper]
John Fitzgerald Online   content


Registered: 10/27/15
Posts: 1734
Loc: S. end of Elkins, Arkansas
I would plan for it to pass over the road, and make it concrete in the parts most likely to erode. I don't think you could install enough culverts to pass that much water under the road. In that case you would plan to put the road on a substantial sized bridge instead of culverts.
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#483288 - 11/28/17 08:10 PM Re: Dam construction in a pond with a liner [Re: PR Cooper]
Bill D. Offline


Registered: 10/19/14
Posts: 5520
Loc: Boone County Illinois
IMO there are times when your best path is to call in a pro. I would get in touch with Bob L. or Mike Otto and ask for a referral to a good pond engineer. I agree with John F. That is a massive amount of water. Providing a robust solution will possibly require modeling, soil analysis, topography info, etc. not to mention some pretty intensive math.


Edited by Bill D. (11/28/17 08:22 PM)
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