Optimizing cascades or systems of reservoirs in small catchments

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3rd Mekong Forum on Water, Food & Energy 2013. Presentation from Session 9: Managing the impacts of dams across cascades.

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Optimizing cascades or systems of reservoirs in small catchments

  1. 1. Managing impacts of dams in cascades The results of MK3 and MK17 • Welcome and opening by Dr Bui Nam Sach • Nguyen Van Tuan - Water availability, use and trends in the Srepok River Catchment • Eric Baran - Managing fish passage through large dams - with specific example of Lower Sesan 2 • Tarek Ketelsen - Managing sediment transport in catchments and through cascades in the Sesan • Simon Tilleard - Managing flows for the environment between Upper and Lower Sesan • Jeremy Carew-Reid - Institutional challenges for managing multiple water use in cascades of dams
  2. 2. • www.optimisingcascades.org
  3. 3. Last year’s MK3 presentations • Trading off hydropower potential for irrigated agriculture - an example from the Sesan river • Increasing habitat diversity in new reservoirs Creating wetlands in the drawdown of the Nam Gnouang reservoir • Flood control challenges for large hydroelectric reservoirs with an example from the Nam Theun-Nam Kadinh basin in Lao PDR
  4. 4. Conclusions • Multiple use of water in cascades of reservoirs is often viable • Other uses do not necessarily diminish the hydropower potential by significant amounts • The potential for multiple use of water should always be explored as part of the feasibility studies for all new dams
  5. 5. General Recommendations • Regulatory agencies should insist that studies be carried out to assess the potential and feasibility of multiple use options for all proposed dams • Developers should include technical, social and economic viability assessments of such multiple uses for proposed dams for example in feasibility studies and EIAs • If multiple use options are considered to be viable and environmentally and socially sound they should be incorporated into the design of new projects
  6. 6. • River basin managers and planners should work with developers and local agencies to explore the possibilities for multiple-use of both existing and proposed hydropower projects, irrigation and water supply reservoirs. • Operators of dams in cascade should work closely together in the coordinating water releases for flood management, irrigation water supply downstream, environmental flows and fish passage and other multiple uses of water.

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