National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Surface runoff was assessed for Koraput district located in Eastern Ghats high land zone of Odisha from rainfall events for 27 years (from 1986 to 2012) using USDA Soil Conservation Service-Curve Number (SCS-CN) method. Highest annual runoff of 681.5 mm (26.5% of rainfall) and lowest runoff of 202.7 mm (22.3% of rainfall) was observed in the year 1990 and 2009, respectively. When month wise compared, highest rainfall and runoff is found in the month of July {384.5 mm and 94.1 mm (24.5%)} followed by August {335.4 mm and 75.4 mm (22.5%)} and September {232.8 mm and 61 mm (26.2%)} and it indicates maximum runoff is generated during kharif (June to September) resulting from higher rainfall. Using the available best fit probability distributions, expected month wise runoff at 10, 20, 30, 40, 50, 60, 70, 80 and 90% probabilities were also estimated. The dependable annual runoff is determined as 10% and 15% of total annual normal rainfall at 80 and 60% probability level and it results in total potential surface runoff of 45007.2 ha-m and 65578.88 ha-m, respectively from the cultivable catchment area of the Koraput district.
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