Streamflow Drought Severity Analysis of Betwa River System (India) |
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Authors: | R P Pandey S K Mishra Ranvir Singh K S Ramasastri |
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Affiliation: | (1) National Institute of Hydrology, Roorkee, 247 667 Uttaranchal, India;(2) Indian Institute of Technology, Roorkee, 247 667 Uttaranchal, India |
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Abstract: | Streamflow appraisal in time and space particularly in semi arid and dry sub humid regions has vital importance in the formulation
of round the year plan of water uses comprising domestic & industrial water supply, irrigation scheduling, reservoir operation,
in-stream flow maintenance etc. Drought severity analysis including the estimation of flow availability, drought duration,
and deficit volume etc. was carried out using the 20–42 years (1960–2001) 10-daily streamflow data of five sites on the Betwa
River system and. independent streamflow drought events were described by pooling the data, and severity of an independent
drought event classified using a new drought severity index (DSIe) defined as a function of (1) the ratio of deficit flow
volume to corresponding volume at the truncation level and (2) the ratio of duration of deficit flow to the maximum possible
duration of the independent streamflow drought event. The study found that the upper reaches of river course were more prone
to severe droughts than were the lower reaches. The drought events starting during August−November were more likely to be
severe drought events than those in the other months. |
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Keywords: | Drought index Drought severity Low flow Drought duration Truncation level Deficit flow |
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