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Water availability study and supply-demand analysis in Kharun sub-basin of Seonath Basin
National Institute of Hydrology, Bhopal and Water Resource Department, Raipur, Chhattisgarh
 
Objectives
 
Pressures on surface water resources are growing throughout Chattisgarh due to increasing demands for irrigation, industry and domestic water supply. As these demands are expected to grow there will be more frequent water deficits in the Kharun basin. Hence the study sought to investigate possible solutions and the PDS set out to:
  1. Assess the current surface water resources of the Kharun basin.
  2. Quantify the frequency of water shortages (droughts).
  3. Seek to develop optimal water resource allocation scenarios given the limited surface water available.
  4. Examine possible new storage dams to augment post monsoon water availability.
 
Results and Recommendations
 
  1. Surface water resources in the Kharun basin at first glance appear to be adequate with a mean annual runoff of 1802Mm3 compared to a present demand of 65Mm3 yet there is a shortfall during the dry months of January to May.
  2. Although water is transferred into the Kharun basin from Ravishankarsagar reservoir there is insufficient reservoir storage within the basin to meet demands.
  3. Rainfall droughts (more than 25% deficiency in annual rainfall) were found to occur twice in 10-years.
  4. A rainfall-runoff (MIKE11-NAM) was used to extend the limited river flow data using longer rainfall records.
  5. The MIKE-BASIN was used to study how existing surface water sources were able to meet the various industrial demands as well as that of Raipur city.
  6. The model was re-run with four potential new storages to examine how future demands might be met.
 
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