Dhr. Ranvir Singh : Water productivity analysis from field to regional scale

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22 Mar 2005 16:00
Unit: Wageningen University
Location: Aula (gebouw 362), Gen. Foulkesweg 1, Wageningen
Promotor: prof.dr.ir. R.A. Feddes (Soil physics, ecohydrology and groundwater management)
Co Promotor: dr.ir. J.C. van Dam

 In this study, we focus on the water productivity analysis from field to regional scale through a physically based simulation modelling approach. Sirsa district, located in the Bhakra Irrigation system in the Northern India, has been selected as a case study. Effects of spatial heterogeneity on the regional water and salt balances, and on the water productivity are analysed by running the field scale ecohydrological Soil-Water-Atmosphere-Plant (SWAP) model for all combinations of weather-crop-soil-water in the study area. Factors responsible for low values of water productivity in Sirsa district include a high share (20 to 40%) of soil evaporation into evapotranspiration especially for rice, percolation from fields and seepage losses (34 to 43% of the total canal inflow) from the conveyance system. Better crop management, reduction in seepage losses and canal water reallocation (15%) from the northern to the central canal commands are recommended to improve the water productivity, and to halt the rising and declining groundwater levels.
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