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Joined: Oct 2025
Posts: 3
K
K Offline
Joined: Oct 2025
Posts: 3
Hello!

I am looking but have not found where anyone has discussed managing spillway height when factoring in dam settling.

I will be installing a bottom draw siphon spillway on my 5 acre lake where the primary water level will be determined by the siphon height. Say my 20 ft dam is going to settle 2 feet (90% compaction), will the height of my siphon:

A: Lower with the overall dam
B: Hold elevation; raising its relative position in the dam
C: Crack due to strain and/or cause dam failure

Joined: Nov 2007
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F
Lunker
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F Offline
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Deleted for being wrong.

Last edited by FishinRod; 10/23/25 11:20 AM. Reason: Wrong
Joined: Jul 2015
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N
N Offline
Joined: Jul 2015
Posts: 245
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I am not an expert but the horizontal pipe does control your pond level. The air break is for when it goes in turbo mode. I may be wrong, but that is the way I see it working.


61 acre water shed lake. bass, channel cat, black crappie, wiper, walleye, redear sunfish, blue catfish and bluegill. To many bullhead and common carp
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F
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F Offline
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I believe nehunter is correct. My prior comment above was incorrect and only referred to an operating siphon. Typical siphon systems operate effectively as a pond outlet - even before they go into siphon mode.


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