Assessment of reservoir sedimentation in Ravishankar reservoir using remote sensing & GIS

Abstract

The Ravishankar Sagar dam is situated in Dhamtari district of Chhattisgarh state. The dam is constructed on river Mahanadi. The Ravishankar Sagar dam is one of the major dams of Multipurpose Mahanadi project, which consists of Pairi, Ravishankar Sagar, Moorumsilli, Dudhawa, Sondur and Sikasar reservoir. The base map of the study area has been presented in Fig 1.0.The Ravishankar Sagar Reservoir project was designed with the following objectives:  Supplying annually 61 Mm3 water to municipal requirements of Dhamtari town and Raipur City.  Converting existing ‘Protective’ Irrigation of Kharif paddy in about 1,82,500 hectare (1,47,500 hectare in Mahanadi old command and 35,000 hectare New area) to ‘Productive’ irrigation by providing timely, reliable and equitable supply of water of the land to boost present per hectare Yield of 1.4 tonnes to about 3 tonnes.  Expanding irrigation in new area of 1,56,500 hectare.  Increasing irrigation intensity in the CCA for present 72% to 100% in Kharif and 1% to 35% in Rabi season.  Additional agricultural production of 11.95 lakhs tonnes values at Rs. 152 Crores at 1990 prices.  Generating farm and non-farm employment to about 1, 80,000 persons.