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Planning of Cost Effective Water Harvesting in a Sub Basin of the Subarnarekha River in the State of West Bengal, India

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Journal of Agricultural Science and Technology(B) 2011年第4期1卷 598-609页

作者： S. Jana D. R. Chowdhury G. Bhandari D. Roy School of Water Resources Engineering Jadavpur University 188 RAJA S.C. MALLIK ROAD Kolkata 700032 India Department of Civil Engineering Jadavpur University 188 RAJA S.C. MALLIK ROAD Kolkata 700032 India

Development and judicious management of available water resources play a key role for economic upliftment of any region. The agricultural pattern and social and demographic status in the upper basin of the Dulung Nala Stream （a tributary of the Subarnarekha River） in the western part of the State of West Bengal, India, reveals growing demand of water in the basin. The paper reports different management plans involving different types of water harvesting structures （and associated different types of water distribution systems） and different crop combinations and with benefit/cost ratios varying from 1.3 to 11.2 for the basin. The study points out that the judicious choice of both the water harvesting structure as well as the water distribution system is important. Proper planning of crop pattern is also to be emphasized for reaping maximum benefit. It further emphasizes that cost- benefit ratio cannot solely govern the choice of structure and that maximum utilization of catchmental water and thus enhancement of agricultural output （and also economic return from the catchment） i.e. quantum of benefit is also important. The water harvesting structures proposed in this study can be implemented in other semi-arid regions of India having almost the same climatic and socio-economic conditions.

关键词： Water harvesting structure irrigation water requirement crop pattern benefit cost analysis.

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