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  2. Open channel spillway - Wikipedia

    en.wikipedia.org/wiki/Open_channel_spillway

    Open channel spillways are dam spillways that utilize the principles of open-channel flow to convey impounded water in order to prevent dam failure. They can function as principal spillways, emergency spillways, or both. They can be located on the dam itself or on a natural grade in the vicinity of the dam.

  3. 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

  4. 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]

  5. Spillway - Wikipedia

    en.wikipedia.org/wiki/Spillway

    This design allows nearly the full height of the dam to be used for water storage year-round, and flood waters can be released as required by opening one or more gates. An uncontrolled spillway, in contrast, does not have gates; when the water rises above the lip or crest of the spillway, it begins to be released from the reservoir.

  6. 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.

  7. 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 ...

  8. The AOL.com video experience serves up the best video content from AOL and around the web, curating informative and entertaining snackable videos.

  9. 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).