ABSTRACT
Scarcity of information on water productivity for different water, land and ecosystems in Africa hampers optimal allocation of the limited water resources. This chapter presents an innovative method to quantify the spatial variability of biomass production, crop yield, consumptive water use and economic water productivity in a data scarce landscape of the Pangani river basin. The methodology integrates actual field data and auxiliary crop information from the literature with remotely sensed data. The water productivity analysis is applied to a heterogeneous African landscape of the Pangani river basin in East Africa. The uncertainty of biomass production was also assessed. The explicit water productivity maps are presented using both non-market (biophysical) and market (economic) methods. This information can inform strategies for increasing the economic water productivity of certain land uses without impacting significantly on the environmental and social benefits. The pixel results for biomass water productivity of a given land use class showed large variations.
