Estimation of Surface Runoff Using GIS-Based NRCS-CN Method in Upper Manimuktha Subwatershed,Tamilnadu,India

Authors

  • Velayudha Das M Research Scholar,Department of Civil Engineering, Annamalai University, Annamalainagar-608002
  • Poongothai S Professor Department of Civil Engineering, Annamalai University, Annamalainagar-608002

Keywords:

Watershed, SCS(NRCS)-CN method, HSG,AMC and Land use/cover

Abstract

Spatial and temporal runoff measurements are required for planning, developing and managing a
watershed sustainably. Among the methods for estimating runoff from rainfall, the SCS (NRCS)-CN method is most
used practical method due to its requirement of single parameter estimation called Curve Number (CN). In the present
study, the runoff from the upper Manimuktha sub-watershed (4C1A2e), an ungauged watershed in Villupuram district
of Tamilnadu, India, has been assessed. IRS 1C LISS-3 satellite images (1995, 2003 and 2012) were used to obtain
land use/land cover information. Hydrologic Soil Groups (HSG) map was prepared from the soil map of the study area.
After integrating land use/land cover and hydrologic soil layers, weighted curve numbers were obtained and mapped
by using ArcGIS 10.5 software. The daily rainfall data were collected from Gomukhi dam and Manimuktha dam
raingauge stations for 25 years (1992-2017) and converted to weighted spatial distributed rainfall by Thiessen polygon
method and used to calculate the daily, monthly and annual runoff. The average annual minimum and maximum
rainfall were 548.23mm (in 2016-2017) and 2151.61 mm (in 2005-2006) and the corresponding runoff were 64.28mm
(in 2016-2017) and 1134.02 mm (in 2005-2006). This study will be useful to estimate runoff from an ungauged
watershed having same characteristics.

Published

2018-03-25

How to Cite

Velayudha Das M, & Poongothai S. (2018). Estimation of Surface Runoff Using GIS-Based NRCS-CN Method in Upper Manimuktha Subwatershed,Tamilnadu,India. International Journal of Advance Engineering and Research Development (IJAERD), 5(3), 68–79. Retrieved from https://ijaerd.org/index.php/IJAERD/article/view/2602