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Asian Journal of Applied Sciences
Year: 2014  |  Volume: 7  |  Issue: 6  |  Page No.: 433 - 440

Restoration of Cascading Tank System Using Geoinformatics Technology

R. Selvakumar, U.A.B. Rajasimman and S. Gunasekaran    

Abstract: In South India, tanks system is quiet ancient, meant for storing and supplying water towards multifunctional needs of the people. In Tamil Nadu, there are around 39,000 tanks with varying size and types. Over past few decades, irrigation rely on stable and reliable groundwater resources like dug and deep bore wells, consequently tanks lost their significance. Moreover, excessive siltation, improper maintenance and illegal encroachment further degraded the system. The deterioration factors are broadly categorised into problems in catchment, feeder channels and head works, eventually resulting in loss of storage capacity. The present study chiefly narrates an indirect method of estimating loss in storage capacity of tanks and the catchment problem, especially soil erosion and its induced downward siltation using geoinformatics technology. Using remotely sensed satellite data by measuring surface area of tank loss in storage capacity was estimated through a model relationship. Using Digital Elevation Model derived topographic wetness indices data, the catchment problem especially, soil erosion areas are identified and remedial measures are suggested. Under prevailing water crisis, it is essential to rehabilitate the tanks through which the surface water potential can be improved subsequently the groundwater quality and quantity will be enhanced.

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