Paper Title :Hydrological Drought Analysis using Stream Flow Drought Index (SDI) – A Case Study for Watrak Basin
Author :Malekwala Fatema Saifee, Nischitha.S.Y
Article Citation :Malekwala Fatema Saifee ,Nischitha.S.Y ,
(2018 ) " Hydrological Drought Analysis using Stream Flow Drought Index (SDI) – A Case Study for Watrak Basin " ,
International Journal of Advances in Science, Engineering and Technology(IJASEAT) ,
pp. 113-116,
Volume-6,Issue-1,Special Issue - 1
Abstract : Drought is a disastrous natural phenomenon. It differs from other natural hazards by its slow accumulating
process and its indefinite commencement and termination. To analyze a drought and its intensity is necessary. Drought has
many facets in any single region and it always starts with the lack of precipitation and may (or may not, depending on how
long and severe it is) affect soil moisture, streams, groundwater, ecosystems and human beings. This leads to the
identification of different types of droughts (meteorological, hydrological, agricultural, socioeconomic), which reflect the
perspectives of different sectors on water shortages. Hydrological drought is associated with the effects of periods of
precipitation (including snowfall) shortfalls on surface or subsurface water supply (i.e., streamflow, reservoir and lake
levels, groundwater). The frequency and severity of hydrological drought is often defined on a watershed or river basin
scale. Drought indices are indispensable tools to detect, monitor, and evaluate drought events. The main objective of
drought indices is drought monitoring, early warning, and improving drought preparedness and mitigation. Various indices
to measure hydrological drought are Standardized Runoff Index (SRI), Effective Drought Index (EDI), Surface Water
Supply index (SWSI), Palmer Hydrological Drought Severity Index (PHDI), Stream flow Drought Index (SDI). In this
paper the study area selected is Watrak River basin, this is a Left bank tributary of Sabarmati River. Watrak and its
tributaries drain an area of 8638 sq km. The hydrological drought is determined using stream flow drought index (SDI). In
this method the streamflow data of the Watrak River is used to calculate SDI, the hydrological drought for 3, 6, 9 and 12
months is determined and categorized as non-drought to severe drought. The result shows that at the end of the year the
intensity of hydrological drought is 60%. The necessary recommendation for mitigation is also discussed.
After doing the validation check with the droughts declared by the government of Gujarat, it is seen that out of 13 data
available only two times the result is negative. Hence 84.5% of the result is validated.
Keywords - Drought, Steamflow Drought Index (SDI), Hydrological Drought, Intensity of Drought, Mitigation
Type : Research paper
Published : Volume-6,Issue-1,Special Issue - 1
DOIONLINE NO - IJASEAT-IRAJ-DOIONLINE-11326
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Published on 2018-04-24 |
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