Behavior of Auxiliary Intake of Ramganga Dam at Low Levels

by Hari Mohan, Chf. Engr.; Design and Research, Irrigation Dept., U.P., India,
Shivaraj S. Tiagi, Asst. Research Officer; U.P. Irrigation Research Inst., Roorkee, India,
Dharam V. Varshney, Research Officer; U.P. Irrigation Research Inst., Roorkee, India,
Heramb D. Sharma, Dir.; U.P. Irrigation Research Inst., Roorkee, India,

Serial Information: Journal of the Hydraulics Division, 1977, Vol. 103, Issue 7, Pg. 753-762

Document Type: Journal Paper


In June, 1975, when the auxiliary intake of Ramganga Dam was being run, its hemispherical trash-rack was lifted up, displaced from its seat, and subsequently sucked into the tunnel. Model studies were conducted to investigate the causes of the trash-rack displacement and of the auxiliary intake behavior at low reservoir levels. The studies indicated that the release of air-water spouts resulting from escape of locked air in the tunnel through the intake shaft at a reservoir level of El.970.46-ft could have lifted up and displaced the hemispherical trash-rack. In order to avoid air entry into the tunnel, a regulation curve for HB valve operation has been suggested to prevent recurrence of such a phenomenon in the future.

Subject Headings: Water intakes | Debris | Reservoirs | Hydrologic models | Displacement (mechanics) | Shafts | Curvature | Valves

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