Flood Routing by Reservoir | Various flood routing Strategies

Flood Routing by Reservoir

Safety Inspection of Dams

The dams are national property – constructed for the development of the national economy and in which large investments and other resources have been deployed. The safety of the dam is a very important aspect for safeguarding the national investment and the benefits derived by the nation from the project. In addition, an unsafe dam constitutes a hazard to human life and property in the downstream reaches.

Classification of Dams

  • Dams should be classified in accordance with size and hazard potential in order to formulate a basis for selecting dams.
  • The height of the dam is established with respect to the maximum storage potential measured from the natural bed of the stream or watercourse at the downstream toe of the barrier.
  • Size classification may be determined by either storage or height, whichever gives the large size category.

Investigation

  • Purpose: The primary purpose of the Phase I investigation programme is to identify expeditiously those dams which may pose hazards to human life or property.
  • Scope:The  investigation  will  develop  an  assessment  of  the general condition with respect to safety of the project based upon available data and a visual inspection, determines any need for emergency   measures   and   conclude   if   additional studies, investigation  and  analyses  are  necessary  and  warranted.
  • Based  upon  the  findings  of  the  review  of  engineering data and the visual inspection, an evaluation will be made of the general  condition  of  the  dam,  including  where  possible  the assessment of the hydraulic and hydrologic capabilities and the structural stability
  • Engineering Data: To aid in evaluating the adequacy of hydraulic and hydrologic capabilities and stability of the dam.
  • Field Inspections:Particular  attention  should  be  given  to  detecting  evidence  of leakage, erosion, seepage, excessive wetness or slushiness in the areas  downstream  of  dam, presence  of  sand  boils,  change  in water table conditions downstream, slope instability, undue settlement,  displacement,  tilting,  cracking,  deterioration  and improper  functioning  of   drains  and  relief  wells.

Evaluation of Structural Stability

  • Design and construction data
  • Operating records
  • Post construction changes
  • Seismic stability

Various flood routing Strategies

  • Inter-Basin water transfer assessment  (Ganga & Brahmaputra Basins)
  • Flood Management by Reservoir in Pakistan (Tarbela & Mangla Reservoir)
  • Extended Muskingum method for flood routing (Hirakud Reservoir)
  • Research on New techniques of river flow measurement on flood condition

1. Hand held Radar

2. Acoustic Doppler Current Profiler (ADCP)

Power Point Presentation with solved examples has been embedded below for better understanding.

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