Estimation of surface runoff in Malattar sub-watershed using SCS-CN method
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Photonirvachak
J. Indian Soc. Remote Sens. (June 2009) 37:291–304
RESEARCH ARTICLE
Estimation of Surface Runoff in Malattar Sub-watershed using SCSCN Method R. Amutha . P. Porchelvan
Received: 5 August 2008 / Accepted : 28 February 2009
Keywords Rainfall-runoff . SCS – CN method . Watershed . Land use/ land cover . GIS
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
R. Amutha ( )1 . P. Porchelvan2 1 Vellore Institute of Technology, Vellore – 632 014, Tamil Nadu, India 2 SMBS, Vellore Institute of Technology, Vellore – 632 014, Tamil Nadu, India
email : [email protected]
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.
Introduction A watershed is the area covering all the land contributes runoff water to a common point. It is natural physiographic or ecological unit composed
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J. Indian Soc. Remote Sens. (June 2009) 37:291–304
of interrelated parts and function. Each watershed has definite characteristics such as size, shape, slope, drainage, vegetation, geology, soil, geomorphology, climate and land use. Watershed management implies proper usage of water to land and other natural resources in a watershed for estimation of runoff which is required for planning, developing and managing the water resources and irrigation scheduling. Runoff is one of the important hydrologic variables used in the water resources applications and management planning. For gauged watershed accuracy of estimation of runoff on land surface and rivers requires much time and effort. In the present study SCS-CN technique was used to generate rainfall runoff model by incorporating spatial variation of the various physiographic characteristics of the study area such as geomorphology, geology, structures, land use/ land cover, soil and drainage pattern integrated with the help of RS data and GIS techniques.
from June to December. The rainfall occurrence during October and November is heavy and significant amount of runoff oc
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