Tehri Hydro Development Corporation Ltd.
Hydro Projects warrant regulation of water for irrigation, flood control and domestic water uses etc. The regulating gates hold and release the required amount of water as and when required. It is necessary to provide a proper functioning gate i.e., the gate should open or close at the required moment in the required dimensions to control the volume of water. High head fixed wheel gates are provided as maintenance gates in the upstream of these regulating gates. Accurate assessment of Hydrodynamic forces on a vertical lift gate is of utmost importance for correct estimation of hoist capacity and proper operation of gate. This paper presents the results of model studies on hydraulic downpull and mathematical calculations carried out to calculate the downpull forces on fixed wheel emergency maintenance gate. Hydrodynamic forces were calculated on model as well as mathematically on various %age openings of gate. Based on static and hydrodynamic forces, self-closure of the gate under unbalanced head of 130.0 m is checked and hoist capacity calculations have been done.
