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I am about to start a 5 acre lake, I met with the contractors and have inputs from the NRCS on the drop structure sizing. The pond location is a good one in terms of economics. It appears that it will only take about 10,000 yards of dirt for the embankment. The embankment is 600 ft long and will back water up for about 1000 ft. It has 6 foot of water at the dam without excavating and 3 ft at about 550 ft from the embankemment. The negative thing about this location is that it has a 400 acre water shed all cultivated soil. There is going to be much more siltation than is desirable. Any one have ideas on away to help control this? I am currently considering building a smaller dam up stream and force the water around it over a grassy area. The draw will be deepened in front of the smaller dam to catch silt which can be cleaned out ever so often. Any thoughts on this would be greatly appreciated.
The road goes on forever and the party nevers end...............................................
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Rocky -- Your thought is a great one -- trying to minimize the problem before it happens!! You can find a little information on the following website. http://www.ngpc.state.ne.us/fishing/programs/aqhabitat/AQrestech.asp I know that it's not much, but maybe it will give you a start. Let's see if other people on the Forum post with good information. If not, I can give you the name and email address for the Nebraska state biologist who is in charge of their aquatic habitat work. He'll be able to tell you more about construction of sediment ponds.
Subscribe to Pond Boss MagazineFrom Bob Lusk: Dr. Dave Willis passed away January 13, 2014. He continues to be a key part of our Pond Boss family...and always will be.
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I would say it depends on how much sediment you're getting. If you lime the sediment ponds & a hard rain covers the lime with sediment well ... If you have access to the watershed maybe you could lime it?
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If you can read this ... thank a teacher. Since it's in english ... thank our military! Ric
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Is there any way that the lay out would be conducive to a combination of terracing and Hickenbottom type risers? http://www.hickenbottominc.com/docs/Hickenbottom_Inlet_Catalog.htm Here's the link. This would allow you to slow the movement of silt laden runoff through your watershed. In so doing, you would slow the water enough to encourage a lot of the sediment to drop out before reaching a well constructed silt dam. I've actually not seen much discussion on this in the past on Pond Boss website. Maybe it's been on here and I just missed it.
Holding a redear sunfish is like running with scissors.
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Who was it saying cattails were good for catching silt? Was that Bob?
Pond Boss Subscriber & Books Owner
If you can read this ... thank a teacher. Since it's in english ... thank our military! Ric
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It could well have been.
IIRC, the thought was a cattail marsh/silt basin up stream from your fishpond.
"Live like you'll die tomorrow, but manage your grass like you'll live forever." -S. M. Stirling
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I would say that cattail root structure would be nice for keeping soils intact, plus the plant itself would absorb nutrients such as phosphorous and nitrogen that are bound to the silt particles. That would work well in combination with my Hickenbottom theory, because the terraces could be constructed so that beds of cattails could be planted in them. If you are in a region that gets some smaller rains these would keep the ground moist enough to plant cattails within the terrace system. If not, then the terraces would need to be planted with hardier drought resistant plants.
Holding a redear sunfish is like running with scissors.
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Holding a redear sunfish is like running with scissors.
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Great idea, Bruce. "Now, you too can make your rural pond look like the Columbus, Ohio freeway system!"
"Live like you'll die tomorrow, but manage your grass like you'll live forever." -S. M. Stirling
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That's funny, Theo. It seems like to me this would be the most economical method for SOME terrains to slow runoff for sediment dropout.
Holding a redear sunfish is like running with scissors.
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Rockytopper, Holy smokes...400 Ac of drainage! I'm very curious to hear the results of the NRCS calc's regarding the watershed hydrology and potential storm inflow. It sounds like you're gonna have about 25 - 30 ac/ft of retention at normal pool after pushin' 10K yds for the dam. What sizes/volumes do they have planned for your principal and emergency spillway? V interesting project for engineering...looking forward to followin this one.
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I thought we might tempt Brettski to enter this thread. He's the man when it comes to this sort of thing! One of the ponds I used to work on had a series of long terraces which lost elevation in opposite directions as they progressed towards the pond. Each terrace end had a Hickenbottom at it's low end so the water "waggled" it's way to the ponds and had a lot of time to deposit silt. I'm kind of the "anti-expert" when it comes to this stuff. It's interesting to me, but I won't live long enough to ever really get it.
Holding a redear sunfish is like running with scissors.
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....and please don't ask me why I'm suddenly obsessed with Hickenbottoms. I think it's just because I enjoy saying "Hickenbottom".
Holding a redear sunfish is like running with scissors.
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(in your best Mr Rogers voice)..can you say Hickenbottom?
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I like the way you say that!
"Live like you'll die tomorrow, but manage your grass like you'll live forever." -S. M. Stirling
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Theo...ya got me
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Currently I have a road along my shoreline that is built up to stop water from flowing into my lake. For now I'm trying to keep water out.
When I'm done digging and ready for water to fill it up, I'll put culverts throught the road with a deep collection trench before the culvert. This should catch some of the silt before it flows through the pipe.
Eddie
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Rockytopper,
Are you saying the runoff from the watershed flows directly into the pond or does it flow into a stream that feeds the pond? If the former, would a levee system around the edge of the pond be of any help?
My first pond, which is supplied by an intermittent stream, has a small silt pond that, over the years, has collected alot of the fall leaf debris and silt from spring runoff. I don't know what effect it has had on the main pond though. I say this only because its location is about 15' from the inlet to the main pond. During heavy rains, the silt pond is probably just a small speed bump.
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400 acres of watershed means that you'll have a lot of transient water in your pond. I have a similar problem, but with 165 acres of wateshed on a pond of only 3 1/2 acres. Sediment buildup can definitely be a problem, but fertilizing and fish loss can also be a concern. Regardless of what the experts say, you do have fish loss during heavy overflow events. I've found hundreds of fish in pasture areas behind my overflows.
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I think Bob has the right idea. Terraces are the way to go, with the spillways staggered left/right from terrace to terrace. This forces the water to spend the most amount of time in the sedimentation pools and thereby gets the most sediment out. I used to work for a company which designed and built mining and soil cleaning process equipment. Often times we would have a slurry of water and soil which would need to be seperated and that is how you do it, except you would call them tanks and wiers instead of ponds and spillways. With 400 acres cultivated dumping into a pond that size, I'd say you'll have big time problems with chemical pollution, sedimentation and water clarity. I'd make as many catch ponds as possible and design them to be easy to clean out. Good luck.
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Originally posted by TN Hillbilly: I think Bob has the right idea. Terraces are the way to go, with the spillways staggered left/right from terrace to terrace. This forces the water to spend the most amount of time in the sedimentation pools and thereby gets the most sediment out. I used to work for a company which designed and built mining and soil cleaning process equipment. Often times we would have a slurry of water and soil which would need to be seperated and that is how you do it, except you would call them tanks and wiers instead of ponds and spillways. With 400 acres cultivated dumping into a pond that size, I'd say you'll have big time problems with chemical pollution, sedimentation and water clarity. I'd make as many catch ponds as possible and design them to be easy to clean out. Good luck. Who's Bob? Just once in my life I wanted to get some props on a pond design thread. Now all my credit goes to "Bob". :p :p
Holding a redear sunfish is like running with scissors.
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You know.....Bob Condomello
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Never knew they were called Hickenbottoms...regardless, they work.
Land all around me has terraces leading into my property. All of them have those inlets and they manage to carry away huge amounts of water, while dropping massive quantities of silt behind the terraces...or so I've been told, because it's been so long since it ACTUALLY rained enough to run off, I can't remember.
Kidding, but in the 4 or 5 toad-choaking, stem winding, ground-pounding rains that I've witnessed here since '98, they've worked well.
In a lifetime, the average driver will honk 15,250 times. My wife figures I'm due to die any day now...
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Sorry Brice.
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Would that be Brice Hickenbottom?
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My First
by FishinRod - 05/04/24 11:01 AM
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