HOW CAN WE CONSTRUCT DAM WITHOUT HARMING AQUATIC BIODIVERSITY?FOR SCIENCE EXHIBITION WORKING MODEL
Asked by abinash.gupta003 | 1st Nov, 2017, 05:13: PM
- Many large dams were built without fish ladders and remain an absolute barrier to fish migration.
- Possible Solution: Trap and haul programs, in which fish are collected and transported by tanker truck around dams, and motorized lifts in various configurations.
- Reforming the timing and intensity of water releases is another major focus.
- Possible Solution: Short periods of high-velocity water releases have been conducted to mobilize accumulated sediment in the river channel, helping restore riparian habitat.
- Reservoirs may emit substantial amounts of methane, a powerful greenhouse gas, when vegetation and algae decay with changing water levels.
- Possible Solution: Controlling erosion in upstream watersheds and managing water elevation more carefully, especially during warm seasons.
- Reservoirs also trap pollutants left behind by past industrial practices, which flow downstream and concentrate behind dams.
- Possible Solution: Constructing a small weir to control the water elevation. Its sediments are contaminated by legacy industrial waste, including PCBs, dioxins, pesticides and mercury.
Answered by Sheetal Kolte | 13th Dec, 2017, 07:29: PM
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