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Is that for hydro or water storage though? Surely you want the flow for hydro.

by sdflhasjd 3y ago

latchkey 3y ago
This isn't about storage. They build hydro dams on running rivers.
- mdorazio 3y ago
  That’s not how it works. After it fills up you have to let water out of the dammed reservoir at the same rate it flows in (on average) or else it overflows. The issues created are related to sediments and flow consistency. More info in the top response here: https://earthscience.stackexchange.com/questions/18287/do-dams-reduce-the-flow-of-river-downstream https://earthscience.stackexchange.com/questions/18287/do-da...
  - latchkey 3y ago
    I don't appreciate the downvote because you aren't listening to what I'm saying. When it rains, it floods. They (stupidly) build dams for rate of flow during low season (cause it isn't raining)... then the wet season comes and the dams all overflow. Poor construction practices doesn't help either. They also build dam after dam along the same river... I've see 10+ of these things... ends up being a chain of mess when the first one fails. Just a bit of googling to give you examples: "Dam design and greed may factor into flood devastation in Vietnam" https://www.refworld.org/docid/58f9ca0c13.html https://www.refworld.org/docid/58f9ca0c13.html https://tuoitrenews.vn/news/society/20231012/investigation-underway-for-broken-hydroelectric-dams-wall-in-vietnams-central-highlands/76126.html https://tuoitrenews.vn/news/society/20231012/investigation-u... https://www.voanews.com/a/vietnam-must-improve-flood-resilience-as-extreme-weather-hits-central-coast-say-experts/7331626.html https://www.voanews.com/a/vietnam-must-improve-flood-resilie...
    - avar 3y ago
      Before the dam they'd have around the same amount of water, actually slightly less than that, as the reservoir loses water through evaporation. Dams don't create water that wasn't there before. It sounds like they're upset that the dam wasn't oversized to handle flood control in addition to hydropower. That's a legitimate gripe with public investment and shortsightedness, but the damn aren't going to be making it worse (unless they're managed by morons).
      - latchkey 3y ago
        > unless they're managed by morons Apparently, you've never been to a country like Vietnam. It is a combination of poor education and greed.
        deleted 3y ago
        [deleted]
      - jdsully 3y ago
        A sudden inrush of water from a dam overtopping can be much worse than a consistent flow even if the absolute quantity is the same.
    - deleted 3y ago
      [deleted]

Is that for hydro or water storage though? Surely you want the flow for hydro.

latchkey 3y ago

This isn't about storage. They build hydro dams on running rivers.

mdorazio 3y ago
That’s not how it works. After it fills up you have to let water out of the dammed reservoir at the same rate it flows in (on average) or else it overflows. The issues created are related to sediments and flow consistency. More info in the top response here: https://earthscience.stackexchange.com/questions/18287/do-dams-reduce-the-flow-of-river-downstream https://earthscience.stackexchange.com/questions/18287/do-da...
- latchkey 3y ago
  I don't appreciate the downvote because you aren't listening to what I'm saying. When it rains, it floods. They (stupidly) build dams for rate of flow during low season (cause it isn't raining)... then the wet season comes and the dams all overflow. Poor construction practices doesn't help either. They also build dam after dam along the same river... I've see 10+ of these things... ends up being a chain of mess when the first one fails. Just a bit of googling to give you examples: "Dam design and greed may factor into flood devastation in Vietnam" https://www.refworld.org/docid/58f9ca0c13.html https://www.refworld.org/docid/58f9ca0c13.html https://tuoitrenews.vn/news/society/20231012/investigation-underway-for-broken-hydroelectric-dams-wall-in-vietnams-central-highlands/76126.html https://tuoitrenews.vn/news/society/20231012/investigation-u... https://www.voanews.com/a/vietnam-must-improve-flood-resilience-as-extreme-weather-hits-central-coast-say-experts/7331626.html https://www.voanews.com/a/vietnam-must-improve-flood-resilie...
  - avar 3y ago
    Before the dam they'd have around the same amount of water, actually slightly less than that, as the reservoir loses water through evaporation. Dams don't create water that wasn't there before. It sounds like they're upset that the dam wasn't oversized to handle flood control in addition to hydropower. That's a legitimate gripe with public investment and shortsightedness, but the damn aren't going to be making it worse (unless they're managed by morons).
    - latchkey 3y ago
      > unless they're managed by morons Apparently, you've never been to a country like Vietnam. It is a combination of poor education and greed.
      - deleted 3y ago
        [deleted]
    - jdsully 3y ago
      A sudden inrush of water from a dam overtopping can be much worse than a consistent flow even if the absolute quantity is the same.
  - deleted 3y ago
    [deleted]