Building Lake Corona

[dragoneggs]

Those last pics give a whole lot more perspective of the size and shape of your future lake! It's going to be fun to see it a year from now!!!

 

[Xfaxman]

For those not familiar with the siphon overflow system:

 

[ovrszd]

Thanks X. I've never saw anything like that around here. Seems very complex. What is the purpose versus a straight pipe laid at an angle buried thru the dam?

 

[dragoneggs]

Thanks X. I've never saw anything like that around here. Seems very complex. What is the purpose versus a straight pipe laid at an angle buried thru the dam?

No expert here but I'm thinking a couple of reasons. Not having to bury the pipe so deep. Siphon vs. Gravity allows your intake to be near the bottom vs at the surface.

 

[workinonit]

I think I am correct in saying that once the vent pipe is covered with water and the water level gets to a point that it flows, it will continue to flow until the water level gets low enough to open the vent. So basically if you blocked the vent after the flow starts you could essentially drain the pond to the intake level. So you can move the vent vertically and make the pond any level you want it to be.

 

[ovrszd]

No expert here but I'm thinking a couple of reasons. Not having to bury the pipe so deep. Siphon vs. Gravity allows your intake to be near the bottom vs at the surface.

The deep water intake I get. I just don't understand the necessity.

For the OP I also get that he doesn't need a BH to set the pipe. With some pre-planning it wouldn't have required deep digging.

I'm all for it. Just never saw it before.

 

[ovrszd]

I think I am correct in saying that once the vent pipe is covered with water and the water level gets to a point that it flows, it will continue to flow until the water level gets low enough to open the vent. So basically if you blocked the vent after the flow starts you could essentially drain the pond to the intake level. So you can move the vent vertically and make the pond any level you want it to be.

To a point. And that same adjustment can be made by changing the top end of a straight pipe.

 

[jk96]

Thanks X. I've never saw anything like that around here. Seems very complex. What is the purpose versus a straight pipe laid at an angle buried thru the dam?

Decided to go this route for a few reasons. First it allows me to easily drain the pond or lower the water level for a period of time if needed. Second would be better water quality. Instead of draining out the fresh water coming into the pond it pulls deeper low oxygen water out and improves overall oxygen for fish. It's actually a pretty simple system and only requires a little extra pipe on the water side and also made for easy installation after the majority of the dam was complete.

 

[pmsmechanic]

Decided to go this route for a few reasons. First it allows me to easily drain the pond or lower the water level for a period of time if needed. Second would be better water quality. Instead of draining out the fresh water coming into the pond it pulls deeper low oxygen water out and improves overall oxygen for fish. It's actually a pretty simple system and only requires a little extra pipe on the water side and also made for easy installation after the majority of the dam was complete.

Another plus for your overflow design choice.

Any time you have a structure through a dam below water level you compromise the integrity of the dam. This design totally eliminates those kind of problems. Now there is no place for water to seep and potentially wash out the pipe.

 

[ovrszd]

Decided to go this route for a few reasons. First it allows me to easily drain the pond or lower the water level for a period of time if needed. Second would be better water quality. Instead of draining out the fresh water coming into the pond it pulls deeper low oxygen water out and improves overall oxygen for fish. It's actually a pretty simple system and only requires a little extra pipe on the water side and also made for easy installation after the majority of the dam was complete.

So to drain the pond you close the vent and wait for a rise in pond level to create a siphoning effect?

Is your inlet suspended up off the bottom?

I need to study your pocs again.

Very interesting design.