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Jan 10th, 2023
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Joined: Jul 2008
Posts: 1,094 Likes: 1
Lunker
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OP
Lunker
Joined: Jul 2008
Posts: 1,094 Likes: 1 |
when i built my pond i out a 12" pipe thru the dam "L" shaped (not straight thru) with a trash rack over it. the trash rack is mounted to a larger pipe that fits over the 12" pipe. it sticks below the surface about 30". so it actually pulls water 30" below the surface. i was told that this is good because the bad water is on the bottom. i have seen people with a pipe sticking straight thru there dam and the outflow is being pulled right off the surface. does it really matter if the out flow is surface or sub surface? i also installed a 4" pipe straight thru with a valve on the dry side of the dam.. too nice for draining or lowering.
the reason for asking these questions is because in some areas around here we have some streams that have lots of water flow. i would think it would take a LARGE pipe to handle this much water. is there a problem with building a concrete type spillway where the water would leave the pond? the water would always be drawn off the surface. if is was built similiar to an emergency spillway (wide, but shallow) seems it would work well even in heavy rains, but would water quality be as good since the surface water would always be leaving?
im looking to buy another piece of land, thats the reason for the questions...
Scott Hanners
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Joined: Mar 2005
Posts: 21,512 Likes: 270
Moderator Hall of Fame 2014  Lunker
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Moderator Hall of Fame 2014 Lunker
Joined: Mar 2005
Posts: 21,512 Likes: 270 |
We have both of those type water control structures. One in one pond and the other in a second. The one with the system that flows from below the surface ( 5 ft down in this system) is much more productive and has better water quality. The other lake is better for swimming but is not that productive.
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Joined: Jul 2008
Posts: 1,094 Likes: 1
Lunker
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OP
Lunker
Joined: Jul 2008
Posts: 1,094 Likes: 1 |
would it make a big difference in water quality if the outer/trash rack pipe went even further down. maybe almost to the bottom?
Scott Hanners
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Joined: Jan 2006
Posts: 16,066 Likes: 279
Moderator Lunker
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Moderator Lunker
Joined: Jan 2006
Posts: 16,066 Likes: 279 |
It should. Deep water is usually fairly lifeless.
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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Joined: May 2010
Posts: 59
Fingerling
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Fingerling
Joined: May 2010
Posts: 59 |
Scott,
One thing to remember with any type of spillway, is that you need to extend the spillway all the way down to the normal stream elevation beyond the downstream toe of the dam. Thus a concrete spillway could get rather pricey. Also you will want to ensure you have a very solid base to evenly support the concrete, and make sure you put plenty of rebar in it to hold it together. Freeze/thaw cycles and the power of water can be very troublesome.
There are lakes in SD from the depression era CCC programs that had concrete spillways, and they still are working, so it can be done.
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