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Joined: Jul 2008
Posts: 8
Fingerling
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OP
Fingerling
Joined: Jul 2008
Posts: 8 |
What are some opinions on constructing the perfect emergency spillway? Would you use concrete, PVC, corrugated pipe....???? Imagine yourself at a 4 to 5 acre pond(hum that just happens to be the size of my pond  oh well). Any Ideas welcome. 
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Joined: Apr 2007
Posts: 2,287
Lunker
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Lunker
Joined: Apr 2007
Posts: 2,287 |
Hey Bulldog Fan. From your question it seems like you're asking about the primary spillway and not the emergency spillway. The "regular" spillway is usually pipe and drains off water under normal conditions and sets your normal full pond level.
The emergency spillway is usually just a lower area on the perimeter of the pond for times when the primary spillway can't handle the flow. It's always lower than the top of the dam to avoid having the excess water go over the dam.
I'm pretty sure that's right...
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Joined: Jul 2008
Posts: 8
Fingerling
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Fingerling
Joined: Jul 2008
Posts: 8 |
Well Kinda I am refering to the E-spillway, But i am afraid that it may get used more than normal. I have a 12" spillway (downpipe) that runs through dam. My pond construction was just complete about 2 months ago and has not filled up yet but I got a Laser Transit and "shot" the grade of my water level (where I am wanting the water to be) and for the water to be 6' at where I have built my dock it will put the water about 16" below to of dam. It is approx 4.5 acre pond. I am not sure that there will ever be a problem with it in the E-spillway, but I wanted to get some Ideas as to how to construct it. The contractor that built my dam (was in a natural valley so just had to dam up the stream that ran through it) put a 20'wide x 12"deep cut out on my dam that i was going to pour in concrete, but I am wanting to move the E-spillway off of dam so now I am looking for more ideas. I think I will have plenty of time it has been raining the past couple of weeks here and the pond has not came up much, it looks like it is only backing water up. I still don't have the whole bottom covered in water yet.
Sorry so longwinded
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Joined: Jan 2005
Posts: 1,239
Lunker
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Lunker
Joined: Jan 2005
Posts: 1,239 |
Bull frog, depending on your water shed Normally 16 inches is not near enough free board. the standard minimun is 3 ft from top of dam to E-spillway. The E-spillway should be as wide as you can make it if it's going to be grass. This spreads the water out and cuts down on erosion. Also allows for the mimnium free board.
 The road goes on forever and the party nevers end...............................................
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Joined: Nov 2006
Posts: 87
Lunker
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Lunker
Joined: Nov 2006
Posts: 87 |
i 'll agree with gw, i thinks he's right
i have a 5-7 acre pond with an 8 inch spillway drain pipe in the dam face. the builder left it several feet from the top . I extended it to within a foot of the top.
my emergency spillway is about a couiple inches higher than the tube , i have to really have a seriuos rain for the eway to see water 6-8 inches in 2 days will usuaslly do it
ive had the pond 2 years and the eway has seen water each year
i'm also the one who got sucked into the tube, do not try to extend the tube when the water is over the level of the pipe it is not safe!!!!!!!
chris garton
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Joined: Jul 2008
Posts: 8
Fingerling
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OP
Fingerling
Joined: Jul 2008
Posts: 8 |
Thanks I guess I shoulda made my signature name UGA FAN(Bull Frog???). Anyway thanks for the info. On another thread that I started "where to put overflow" Jersey said he had two 12" siphons on his dam I was thinking i may could construct something like this(maybe just one siphon) as well as my downpipe spillway and an E-spillway
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Joined: Nov 2004
Posts: 1,074
Lunker
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Lunker
Joined: Nov 2004
Posts: 1,074 |
Lots of good stuff. The spillway's job is to protect the dam.
It should let water out safely so the water will not go over the top of the dam and wash it out.
Grass, concrete, pipe will all work.
otto
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Joined: Oct 2005
Posts: 1,285 Likes: 1
Lunker
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Lunker
Joined: Oct 2005
Posts: 1,285 Likes: 1 |
There are also some really good geotextiles to reinforce the turf available. I think Brettski did a fair amount of research on this during his construction.
 "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge." Stephen W. Hawking
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Joined: Oct 2005
Posts: 6,934 Likes: 2
Ambassador
Field Correspondent Lunker
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Ambassador
Field Correspondent Lunker
Joined: Oct 2005
Posts: 6,934 Likes: 2 |
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Joined: Jan 2005
Posts: 469
Lunker
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Lunker
Joined: Jan 2005
Posts: 469 |
Bulldog Fan,
If you haven't built your pond yet, I would tell you to seriously look into the siphon system. You don't need a siphon and a downpipe. The siphon sucks water off the bottom, which is a good thing. I also know a guy near you that I very highly recommend to build. Good price, great job. PM me if you are interested.
Hey Moe, I'm trying to think but nuthin's happening!
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Joined: Apr 2007
Posts: 2,287
Lunker
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Lunker
Joined: Apr 2007
Posts: 2,287 |
I like my siphon. I don't have aeration so at least I can move some of the bottom water out when it rains.
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Joined: Jul 2008
Posts: 8
Fingerling
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OP
Fingerling
Joined: Jul 2008
Posts: 8 |
Really like the Geotextile ideas. Yes the pond is already dug but not full yet thanks for all the info. The siphon has to be put in when the dam is being constructed?
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