A Procedure for Assessment of Environmental Flows Incorporating Inter- and Intra-Annual Variability in Dam-Regulated Watersheds

Ravindra Kumar Verma (), Ashish Pandey, Surendra Kumar Mishra and Vijay P. Singh
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Ravindra Kumar Verma: Indian Institute of Technology
Ashish Pandey: Indian Institute of Technology
Surendra Kumar Mishra: Indian Institute of Technology
Vijay P. Singh: Texas A&M University

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2023, vol. 37, issue 8, No 20, 3259-3297

Abstract: Abstract Many investigations have highlighted the importance of 32 indicators of RVA method and its modified framework in the evaluation of inter-annual and/or intra-annual low and high flow variability in river systems. Yet none of the previous investigations have taken inter-annual and intra-annual minimum e-flow variability for preserving aquatic organisms, especially in dry periods. To this end, this study proposed a procedure which consisted of modified 72 hydrologic indicators and Tennant method and applied the procedure to five sub-watersheds of Damodar catchment, India. Results showed (1) high intra-annual and inter-annual variability of all indicators within water years; (2) that none of the studied watersheds met the 10% minimum flow criterion for poor habitat conditions as recommended by Tennant method in dry years and as well as most of time none of the watersheds exhibited the availability of assured e-flow in all water years; and (3) that aquatic organisms of the catchment would become more vulnerable in the future.

Keywords: Procedure; E-Flows; Inter-and Intra-annual variabilities; Damodar catchment (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11269-023-03502-3

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