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Vol. 7, Issue 5 (2018)

Estimation of runoff generating capacity of a small watershed

Abhishek Ranjan and Dr. DM Denis
Water is the basic requirement for existence of all forms of life on the earth. Water is abundantly available on the globe as it covers nearly three quarters of the earth surface. More than 97% of the earth’s water is found in the seas and oceans, which is salty and unfit for drinking and irrigation. Another 2% is locked up in the Polar Regions in the form of ice and the remaining 1% a meager fraction is trapped in under-ground reservoirs and remains meager fraction that forms the world’s main source of water supply. That work is entitled with Estimation of runoff generating capacity of a small watershed.” is undertaken with the following objectives are: To compute runoff coefficient for the selected watershed, To predict monthly runoff at different percent probability levels and to predict annual runoff at different percent probability levels. This study done on Nagwan Watershed of Damodar Barakar Catchment (Jharkhand, India). The monthly and the annual runoff at different percent probability levels were determined by using Weibull’s method. July month has the highest average runoff followed by September and August while October has the lowest value of average runoff. July has higher value of runoff coefficient than June due to higher antecedent moisture present in soil and the annual runoff coefficient for the watershed is 0.38. September month has the highest value (0.47) of runoff coefficient while June has the lowest value (0.18). At 50% probability level, the monthly runoff in September is maximum (= 81.4 mm) followed by August (79.7 mm), July (66.5 mm) and June (18.1 mm) while it is minimum in October (8.7 mm) and the expected annual runoff value is 325.4 mm. Whereas at 75% probability level, the expected monthly runoff is maximum in August (= 43.9 mm) followed by September (39.8 mm) and July (30.3mm) while there is no chance of any runoff in October and expected annual runoff is 209.6 mm.
Pages: 148-158  |  875 Views  86 Downloads

The Pharma Innovation Journal
How to cite this article:
Abhishek Ranjan, Dr. DM Denis. Estimation of runoff generating capacity of a small watershed. Pharma Innovation 2018;7(5):148-158.
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