Estimation of surface runoff in Malattar sub-watershed using SCS-CN method |
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Authors: | R Amutha P Porchelvan |
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Institution: | 1.Vellore Institute of Technology,Vellore,India;2.SMBS,Vellore Institute of Technology,Vellore,India |
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Abstract: | Nowadays watershed management plays a vital role in water resources engineering. Watershed based on water resources management
is necessary to plan and conserve the available resources. Remote Sensing (RS) and Geographic Information System (GIS) techniques
can be effectively used to manage spatial and non spatial database that represent the hydrologic characteristics of the watershed
use as realistically as possible. The present study area is Malattar subwatershed (4C2B2) lies in the region Gudiyattam Block,
Vellore District, Tamil Nadu. The daily rainfall data of Gudiyattam rain gauge station (1971–2007) was collected and used
to predict the daily runoff from the watershed using Soil Conservation Service — Curve Number (SCS — CN) method (USDA, 1972)
and GIS. Monthly and annual runoff have been calculated from the monthly rainfall data for the years of 1971 to 2007 in the
watershed area. The average minimum and maximum rainfall for the years of 1971 to 2007 is 35.30 mm and 111.61 mm respectively
and average runoff for the year of 1971 to 2007 is 31.87 mm3 and 47.04 mm3 respectively. The developed rainfall-runoff model is used to understand the watershed and its runoff flow characteristics. |
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