International Journal of Ecology and Environmental Sciences
Runoff estimation in steep slope forested Dzumah watershed of Upper Dhansiri, Nagaland using standard and modified Curve Number method
Abstract
In the present study, an attempt was made to assess the suitability of both the standard and modified NRCS-CN method in determining the amount of runoff in a steep slope watershed. Based on recent findings and improvements, the modification to the standard CN method consisted of integrating slope factor and adjustment of λ value in the initial abstraction (Ia) parameter from the traditional constant value of 0.2 to 0.05. The study was carried out in Dzumah watershed of Upper Dhansiri in Nagaland, northeastern India. Rainfall-runoff events were studied for two years i.e., 2019 to 2020 using both the standard and modified CN method.The runoff depths estimated by the standard CN method for 2019 and 2020 were only 109.95 mm and 33.25 mm, representing just 9.49% and 3.78% of total rainfall received in each year. On the other hand, the modified CN method estimated runoff depths of 505.34 and 340.97 mm, which was 43.60 and 38.76 % of the total rainfall received during 2019 and 2020. Rainfall-runoff correlation studies also revealed that the modified CN method showed better correlation with R2 values of 0.858 and 0.944 as compared to the standard CN method with R2 values of 0.166 and 0.650 during 2019 and 2020, respectively.The study indicated that standard CN method is inadequate for runoff estimation from steep slope forested watersheds. Integration of slope factor and λ value adjustments to standard CN method gave better runoff estimates as well as better rainfall-runoff correlation as compared to the standard CN method.
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References
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