SCS-CN and GIS-based approach for identifying potential water harvesting sites in the Kali Watershed, Mahi River Basin, India

The Kali sub-watershed is situated in the semi-arid region of Gujarat, India and forms a part of the Mahi River Watershed. This watershed receives an average annual rainfall of 900mm mainly between July and September. Due to high runoff potential, evapo-transpiration and poor infiltration, drought l...

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Bibliographic Details
Published in:Journal of Earth System Science 2009-08, Vol.118 (4), p.355-368
Main Authors: Ramakrishnan, D., Bandyopadhyay, A., Kusuma, K. N.
Format: Article
Language:English
Subjects:
Annual rainfall
Annual rainfall data
Arid regions
Arid zones
Check dams
Dams
Decision trees
Dikes
Drought
Earth and Environmental Science
Earth Sciences
Earth, ocean, space
Exact sciences and technology
Farm ponds
Geographic information systems
Geographical information systems
Information processing
Parameters
Percolation
Permeability
Ponds
Precipitation
River basins
Rivers
Runoff
Runoff coefficient
Semi arid areas
Semiarid lands
Semiarid zones
Site selection
Slopes
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Spatial analysis
Storage
Structures
Studies
Transpiration
Water harvesting
Water resources
Watersheds
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Summary:The Kali sub-watershed is situated in the semi-arid region of Gujarat, India and forms a part of the Mahi River Watershed. This watershed receives an average annual rainfall of 900mm mainly between July and September. Due to high runoff potential, evapo-transpiration and poor infiltration, drought like situation prevails in this area from December to June almost every year. In this paper, augmentation of water resource is proposed by construction of runoff harvesting structures like check dam, percolation pond, farm pond, well and subsurface dyke. The site suitability for different water harvesting structures is determined by considering spatially varying parameters like runoff potential, slope, fracture pattern and micro-watershed area. GIS is utilised as a tool to store, analyse and integrate spatial and attribute information pertaining to runoff, slope, drainage and fracture. The runoff derived by SCS-CN method is a function of runoff potential which can be expressed in terms of runoff coefficient (ratio between the runoff and rainfall) which can be classified into three classes, viz., high (>40%), moderate (20–40%) and low (
ISSN:0253-4126
2347-4327
0973-774X
DOI:10.1007/s12040-009-0034-5