HOW CAN WE CONSTRUCT DAM WITHOUT HARMING AQUATIC BIODIVERSITY?FOR SCIENCE EXHIBITION WORKING MODEL

Asked by abinash.gupta003 | 1st Nov, 2017, 05:13: PM

Expert Answer:

  • 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

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.