Runoff Estimation of Watershed in Hemavathy Basin using GIS based SCS-CN Method

K. Balakrishna, H. B. Balakrishna


Estimation and quantification of catchment surface runoff an important hydrologic variable used in most of the
water resources applications watershed development and management problems. In this study, rainfall-runoff
relationship of Hemavathy river basin is determined using Soil Conservation Services-Curve Number (SCS-CN)
method for runoff estimation for ungauged watersheds. The important parameters considered include land use/land
cover, soil, vegetation, drainage, precipitation, contour, slope, daily rainfall data. From the 11year daily rainfall data
daily runoff was estimated using SCS CN equation considering antecedent moisture conditions. Daily runoff depth in
the watershed was then computed using SCS-CN equation was later converted to runoff volume. It was observed in
runoff potential of the watershed about 41% of area having high CN value interprets in more runoff. The runoff thus
calculated was compared with gauged flow at dam site observed that regression coefficient is almost same for both
estimated and observed data and an increase of about 15% in inflow data as per project authorities in the catchment
which may be due to regenerated water from irrigation and presences of perennial streams in the catchment even
during non-monsoon months there is inflow observed.


Antecedent Moisture Condition, Curve Number, GIS, Hydrologic Soil Group, SCS-CN, Surface Runoff

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