- Natural weathering will cause deterioration of poor quality concrete and corrosion of metals.
- Poorly designed outlet conduits and structures will crack or fail when subjected to excessive pressures and forces.
- Water can infiltrate cracks leading to corrosion of reinforcing steel and breakdown of concrete during freeze-thaw cycles.
- Deterioration of outlet conduits and structures can lead to costly repairs, inadequate spillway capacity, leakage, and erosion of the dam.
- Leakage is a serious sign of deterioration of outlet conduits and structures.
- Leaks can develop through poorly sealed joints in pipes and concrete structures.
- Water Leaking into or out of conduits will erode the dam, eventually leading to dam failure.
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- Small cracks in concrete structures should be sealed with a quality polyurethane caulk.
- Maintain protective galvanization, paints and coatings on metal structures and reinforcing steel.
- Apply concrete sealers or topcoats to protect slightly weathered concrete.
- Slipline corroded corrugated metal pipes with pressuretight plastic pipe that is grouted in place or line the pipe with cast-in-place pipe.
- Severely deteriorated outlet conduits and structures should be evaluated by a qualified engineer to determine the best course of action.
- Poorly sealed joints in conduits should be sealed with expandable rubber gaskets or by injecting hydrophobic urethane sealant.
- Severely deteriorated structures should be evaluated by a qualified engineer to determine the best course of action.
- Corroded corrugated metal pipes with holes should be replaced. Plans for replacement must be prepared by a qualified engineer and submitted to NeDNR for approval.
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