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.
- 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.