Hirakud Reservoir, a multipurpose project on river Mahanadi was commissioned in 1958 to protect coastal Orissa from devastating floods along with providing irrigation and hydro power benefits. About 25,000 sq.km of Mahanadi catchment is intercepted at Hirakud dam which has a spill way capacity of about 12 million cusec. The assignment undertaken by SPARC involved taking cross sectional details of the river from the dam up to head of the delta (about 300 km downstream), mapping of land use and important infrastructure along the river from remote sensing data and generating a digital elevation model of the area of interest (dam up to delta head) from topographic maps. These inputs were utilized for land submergence analysis under (a) dam break situation & (b) full release from the dam through the spill ways. The exercise was carried out to consider enhancement of spill way capacity of the barrier.
The dam break analysis study helped in
- GIS based decision support tool with integrated land use, terrain and infrastructure data
- Visual representation/ information on carrying capacity of the rivers and bank spill in different reach of the river
High Resolution Satellite Imagery, Geographic Information System, Database Management System