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Natural Pond Overflow Pipe Backs Up: Clogged or Undersized?

Natural pond, 50+ yr old drain pipe. At pipe level = flows. Above = slows, overflows back. Asks: vacuum effect? Semi-clogged? Book for rebuild (liner, underlay).

Physics: Undersized or Clogged

Pipe too small for peak flow.
Partial clog (roots, sediment).
Vacuum effect unlikely — gravity flow.

Action

Measure pond area, pipe diameter.
Inspect/clean pipe (jetter).
If undersized, upgrade pipe.

Rebuild Resources

Search web for "pond liner underlay installation" — many guides. Unique situation = custom solution.

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