I am fortunate to say i still have a lake. thanks to heavy clay/rock mix soil used on our dam.
While out of town, we recieved a very large amount of rain couple days ago. came back today and noticed my lake down 3 ft.
This corrigated metal culvert around 30", is connected to a larger horizontal culvert pipe. the horizonatal pipe has been starting to rust out the past year. We were in the process of designing a concrete spillway, but this happened 1st.
I have a emergency spillway, that worked. but the clay/dirt around this pipe must have gotten washed out from a leak.( im guessing) Now we are going to siphon down 4-5 ft in order to let this dry out so we can replan and give us some time in case it rains again.
Its still pretty unstable, so i place some plastic/rocks over where the water is entering to this hole. it stopped it from washing out even more, and is just draining at the moment.
if this drys out soon, could i pack more heavy clay into this to seal it off. ?
I took some more photos this morning. after laying some plastic to keep it from being washed out. Tomorrow, i should have everything here to make a 8" siphon drain, we want to take this down another 4-5 feet.
It might take awhile to get it down. But it supposed to rain some more this week.
Thanks for the suggestions, everyone is appreiciated. I may use some of the suggested things Thank you
I had trouble finding 8" or larger pvc pipe quickly. So we went with 6" Sewer pipe(cheap thin wall) we hooked it all up, and started it up, part of the pipe collapsed ( sucked together) It was still siphoning, but maybe around 60% the flow.
Next day i orderd SDR-35 heavy pipe 6" and set it all up. it worked great. both siphons were working.
I couldnt believe how much water those 2 6" siphons were taking out.
Lake is about 5ft down, and still going. we had a excavator guy come in that has experiance repairing dams and building them. we are going to plug the pipe with concrete, then compact clay with a mini excavator ( compactor attachment)
Next is the spillway design and estimates. I cant go back to these ,in the dam drain pipes. between beavers,heavy rains and misc debris floating into it , its to risky...
i Will have pics up of my siphon system and how bad of shape the culvert pipe was it. It was a dissaster just waiting to happen.