25 Aug Prafulkumar V Timbadiya
Prafulkumar V Timbadiya, India
BE (Civil), M.E(WRE), PhD Received “IEI Young Engineer Award-2015 in Civil Engineering Discipline in India Received ‘ASCE Best Case Study Award-2016’ for the publication in Journal of Hydrologic Engineering.
Presentation Title: Assessment of Environmental Flows for the Tapi River basin, India
The environmental flows play an important role in the protecting aquatic bio-diversity but its estimation in the developing countries are still at the primary level. The National Commission for Integrated Water Resources Development Plan (NCIWRDP, 1999) projected about 10 km3 and 20 km3 for year 2025 and 2050 respectively, for India as environmental need without specifying any geographical specification and any technical/scientific basis. Basin specific e-flow research has not been fully initiated in India. In the present study, an attempt has been made to assess the e-flow in the Tapi River basin having area of 65,145 km2 and 14.9 BMC mean annual runoff. The e-flow has been computed at station Burhanpur, Savkheda and Sarangkheda located at Chainage 241 km, 388 km and 480 km respectively starting from upstream on the 724 km long Tapi River using monthly time series of the flow collected from Central Water Commission for last about 30 years. The global e-flow calculator jointly developed by International Water Management Institute, Sri Lanka and the Water Systems Analysis Group of University of New Hampshire, USA used time series data of the flow of the aforesaid stations unaffected by regulation of the structure during whole year. The actual mean annual runoff (MAR) at Burhanpur, Savkheda and Sarangkheda is found to be 4317 MCM, 8043 MCM, 8404 MCM respectively and required MAR for natural management of the river is 50.1 %, 52.2% and 56.1 % of actual MAR. Further, if the MAR fall below 0.7%, 1.6% and 1.4% of the actual MAR at Burhanpur, Savkheda and Sarangkheda respectively, then the river under consideration will reach to the critically modified state at that location and hence, total natural habitat and biota will lost. The study presented will prepare ground for the comprehensive study on EF for the Tapi basin.