4 ms·

The paper is far more illuminating: https://agu.confex.com/agu/fm19/meetingapp.cgi/Paper/503994 https://agu.confex.com/agu/fm19/meetingapp.cgi/Paper/503994 Thi

The paper is far more illuminating: https://agu.confex.com/agu/fm19/meetingapp.cgi/Paper/503994 https://agu.confex.com/agu/fm19/meetingapp.cgi/Paper/503994 This similar to some of the things I've heard about in central india(I think) where they create half moon dams (less than 2m(8ft) tall) that hold water back creating mini-lakes. This serves two purposes: one it slows down water, meaning that flash flooding is reduced. Two is keeps water hanging around longer, meaning it makes the area less arid. However it means more mosquitoes, so its not all good.

CameronNemo 7y ago
Dams also interfere with fish migration and reproduction. Even small ones are not exempt from that without careful workarounds.
- macewindu 7y ago
  Are there migrating fish in the area of Central India that OP talked about?
  - CameronNemo 7y ago
    If there are fish in the river at all, the biological diversity could be limited by the inability for those fish to wander beyond their side of the dam. I am not sure if there are salmonid fish there, or other fish that require swimming upstream to reproduce. I would doubt it that far inland.
    - soperj 7y ago
      You'd be surprised. They used to go as far inland as idaho.
- KaiserPro 7y ago
  The term I was looking for is "Johads" https://www.notechmagazine.com/2015/06/water-johads-a-low-tech-alternative-to-mega-dams-in-india.html https://www.notechmagazine.com/2015/06/water-johads-a-low-te... They expressly do not dam a stream, they collect runoff. You put them in low lying areas that normally form puddles in monsoon. The idea is to prevent runoff, just like the ones in peru.
dredds 7y ago
Australian example - "For more than a decade, two farmers have shown that parched landscapes can be revived. And finally Canberra [is] listening." https://www.youtube.com/watch?v=-4OBcRHX1Bc https://www.youtube.com/watch?v=-4OBcRHX1Bc
- KaiserPro 7y ago
  Ahh smashing, Its interesting to note that the aussie version involves leaky weirs. I suspect thats because the rain pattern in the indian example is different.

CameronNemo 7y ago

Dams also interfere with fish migration and reproduction. Even small ones are not exempt from that without careful workarounds.

macewindu 7y ago
Are there migrating fish in the area of Central India that OP talked about?
- CameronNemo 7y ago
  If there are fish in the river at all, the biological diversity could be limited by the inability for those fish to wander beyond their side of the dam. I am not sure if there are salmonid fish there, or other fish that require swimming upstream to reproduce. I would doubt it that far inland.
  - soperj 7y ago
    You'd be surprised. They used to go as far inland as idaho.
KaiserPro 7y ago
The term I was looking for is "Johads" https://www.notechmagazine.com/2015/06/water-johads-a-low-tech-alternative-to-mega-dams-in-india.html https://www.notechmagazine.com/2015/06/water-johads-a-low-te... They expressly do not dam a stream, they collect runoff. You put them in low lying areas that normally form puddles in monsoon. The idea is to prevent runoff, just like the ones in peru.

dredds 7y ago

Australian example - "For more than a decade, two farmers have shown that parched landscapes can be revived. And finally Canberra [is] listening." https://www.youtube.com/watch?v=-4OBcRHX1Bc https://www.youtube.com/watch?v=-4OBcRHX1Bc

KaiserPro 7y ago
Ahh smashing, Its interesting to note that the aussie version involves leaky weirs. I suspect thats because the rain pattern in the indian example is different.