Reservoir Sedimentation —Estimation and Remedial Measures
- Vol.LI(4), Oct-Dec
- Mumbai Indian Water Works Association 2019
- 295-301p.
Abstract: Present study deals with Sediment deposition rate calculation for Jayakwadi (Nathsagar) Reservoir; which is a lifeline of Marathwada region of Maharashtra State, IndiaAssessment of sediment deposition in Nathsagar Reservoir has been carried out with the help of Satellite Remote Sensing (SRS) technique. Water spread area has been calculated with help of cloud free satellite images using ArcGIS software andfirrther estimated live Storage capacity of reservoir. Findings of the study shows that sediment index is almost twice (using satellite image, LANDSAT 7) as compared with the designed sediment index at the planning stage and LISS-III Sensor (RESOURCESAT 2 Satellite) also showing somewhat same results. The analysis reveals that during last 42 years of operation, Jayakwadi Reservoir (Nathsagar) has lost its 27% of live storage capacity. The rate of deposition is alarming which is lowering the age of the reservoir very fast. A suitable method must be adopted to minimize the sediment deposition for increasing or maintaining the maximum live storage capacity. Confluence of Godavari and Pravara rivers are taking place before it enters into the Jayakwadi reservoir so a river which carrying more silt with it should be obstructed by constructing a wall. A wall should have closure dike to obstruct water carrying sediment load and overflow dike to pass the clear water into main stream. Sediment storage reservoir will form by constructing wall from which new spillway will flush the sediment load to flushing channel. Further, the study can be extended for a hydrographic survey preferably using DGPSfor calculation of sediment deposition in dead storage zone, which can be clubbed with the present study for further assessment of Gross Storage Capacity. Key Words: Sedimentation, Live Storage Capacity, Satellite Remote Sensing (SRS) Technique, Water Spread Area, LANDSAT 7, LISS-III, Overflow dike, Hydrographic Survey.