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Satellite remote sensing derived spatial water utilisation index (wui) for benchmarking of irrigation systems

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Abstract

Water Utilisation Index (WUI) defined as area irrigated per unit volume is a measure of water delivery performance and constitutes one of the important spatial performance indicators of an irrigation system. WUI also forms basis for evaluating the adequacy of seasonal irrigation supplies in an irrigation system (inverse of WUI is delta, i.e. depth of water supplied to a given irrigation unit). In the present study WUI and adequacy indicators were used in benchmarking the performance of Nagarjunasagar Left Canal Command (NSLC) in Andhra Pradesh. Optimised temporal satellite data of rabi season during the years 1990–91 and 1998–99 was used in deriving irrigated crop areas adopting hierarchical classification approach. Paddy is the predominant crop grown and cotton, chillies, sugarcane etc. are the other crops grown in the study area. Equivalent wet area (paddy crop area) was estimated using the operationally used project specific conversion factors. WUI was estimated at disaggregated level viz., distributary, irrigation block, irrigation zone level using the canal discharge data. At project level, WUI estimated to be 65 ha/MCM and 92 ha/MCM during rabi season of 1990–91 and 1998–99 years respectively. A comparison of total irrigated area and discharges corresponding to both the years indicate that irrigation service is extensive and sub optimal during 1998–99 and it is intensive and optimal in 1990–91. It was also observed that WUI is lesser in blocks of with higher Culturable Command Area (CCA) compared to the blocks of lower CCA. All the disaggregated units were ranked into various groups of different levels of water distribution performance. The study demonstrates the utility of WUI as spatial performance indicator and thus useful for benchmarking studies of irrigation command areas. The WUI together with satellite data derived spatial irrigation intensity, crop productivity constitutes important benchmarking indices in irrigation command areas.

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Authors and Affiliations

  1. Water Resources Division, National Remote Sensing Agency, Department of Space, Balanagar, 500 037, Hyderabad, India

    A. V. Suresh Babu & V. Venkateshwar Rao

  2. Research & Development Unit, Jawaharlal Nehru Technological University, 500072, Hyderabad, India

    I. V. Muralikrishna

Authors
  1. A. V. Suresh Babu
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  2. V. Venkateshwar Rao
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  3. I. V. Muralikrishna
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Correspondence to A. V. Suresh Babu.

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Suresh Babu, A.V., Venkateshwar Rao, V. & Muralikrishna, I.V. Satellite remote sensing derived spatial water utilisation index (wui) for benchmarking of irrigation systems. J Indian Soc Remote Sens 35, 81–91 (2007). https://doi.org/10.1007/BF02991836

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  • DOI: https://doi.org/10.1007/BF02991836

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