Pond pictures from this summer

[SE-Ia Cowman]

Sorry for the delay guys with winter shut down i have been out of the dirt work mood and in to mechanic mood.
First question compaction under the pipe.
the pipe was set on ground that met +95% compaction then we poured concrete under the pipe hence the blocks and wedges to keep at least .5' for concrete to flow under and around the pipe, forms were 12'' tall then we poured the mud stiff enough to push up aginst the pipe halfway up. Hard to put in to words but the whole lower half and .5' under the pipe is bedded with concrete. Then we used a jumping jack and packed the top half we had to have 2' covering the pipe before we could cross it with a sheeps foot. In sted of anti seep collors the use a sand diaphram it crosses the pipe in the middle of the dam 3'wide 15'long goes from 6' below pipe to 12' above the pipe then runs parallel with the pipe about 6' to the side down to the outlet channel. The engineers think if the water ever tunnels along side of the pipe it will filter down through the sand at the half way point and have a controlled path to the outlet and not wash out the dam.

Yes scrub the pipe is for normal rain water the emergency spillway has a 4% inlet section a 30' wide by 72' long control section and the rest is 2% outlet section. It is along the far end of the dam. With 12' of stage between the pipe and the emergency this pond will likely not see any emergency water for many years, engineer says 100 year flood but around here we have one of them every other year.

 

[SE-Ia Cowman]

Just reading more and Scrubs the pipe realy isnt that low in the bank there is a lot of dam above the pipe for more storage and longer draw down period for as you stated flood control. the 12' feet of freeboard from pipe to emergency spillway doubles the acrage of the pond and that is a volume increase of 4x what it holds at normal pool. Lets just say it takes a 10'' rain to fill the pond after it was finished then it should take 40'' to get from the pipe to the emergency spillway. these numbers are not realistic but makes for a good example.
As for the instalation we put the pipe in to there exact specs. But the goverment proably spent twice what it cost to build the pond in designing it so it probably is not going to work if it is like anything else our goverment does these days.

 

[SE-Ia Cowman]

Also the upper end of the pipe had a concrete pad poured around it 12' wide by 12' long then we poured 12' wide on the slope above the pipe up about 6' in elavation. this should keep the swirrling around the pipe from washing any.

 

[Tracklayer]

SE-Ia Cowman,

Thanks for that explanation about supporting the pipe. I had wondered about the possibility of an approach that would grout under the pipe once it was blocked up like you show. It sounds like that is exactly what you did. It sounds like a very well engineered project.

 

[RDG]

Just looking at the pipes sitting on blocks, how do you compact the material under the pipe, or is it filled with concrete? also noticed the bucket on while lifting pipes, they would shoot u for that over here. Cheers RDG.