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  2. Concrete degradation - Wikipedia

    en.wikipedia.org/wiki/Concrete_degradation

    When atmospheric carbon dioxide (CO 2), or carbonate ions (HCO − 3, CO 2− 3 dissolved in water) diffuse into concrete from its external surface, they react with calcium hydroxide (portlandite, Ca(OH) 2) and the pH of the concrete pore water progressively decreases from 13.5 – 12.5 to 8.5 (pH of water in equilibrium with calcite).

  3. Dam failure - Wikipedia

    en.wikipedia.org/wiki/Dam_failure

    The reservoir emptying through the failed Teton Dam on June 5, 1976 Ruins of the dam of Vega de Tera (Spain) after breaking in 1959. A dam failure or dam burst is a catastrophic type of structural failure characterized by the sudden, rapid, and uncontrolled release of impounded water or the likelihood of such an uncontrolled release. [1]

  4. Check dam - Wikipedia

    en.wikipedia.org/wiki/Check_dam

    Concrete check dams in Austria A steel check dam A common application of check dams is in bioswales, which are artificial drainage channels that are designed to remove silt and pollution from runoff. A check dam is a small, sometimes temporary, dam constructed across a swale , drainage ditch , or waterway to counteract erosion by reducing water ...

  5. As removal of dams frees Klamath River, California tribes see ...

    www.aol.com/news/largest-dam-removal-u-history...

    Thompson was 7 when she saw the dead fish floating in the river, and that memory has stayed with her. She saw it as evidence that dam removal was essential for restoring the river's health.

  6. Drop structure - Wikipedia

    en.wikipedia.org/wiki/Drop_structure

    A drop structure, also known as a grade control, sill, or weir, is a manmade structure, typically small and built on minor streams, or as part of a dam's spillway, to pass water to a lower elevation while controlling the energy and velocity of the water as it passes over. Unlike most dams, drop structures are usually not built for water ...

  7. Recap: After rain, erosion caused Manawa mill pond to drain ...

    www.aol.com/manawa-reports-city-entrances...

    Earlier that day, erosion at the shore beside the Manawa Mill Pond dam caused water to rush downstream, flooding parts of the city. Manawa receives up to 4 inches of rain

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