Multiobjective Analysis of Green-Blue Water Uses in a Highly Utilized Basin: Case Study of Pangani Basin, Africa

AbstractThe concept of integrated water resource management (IWRM) attempts to integrate all elements of water resources. Different tools are developed to assist in developing sound IWRM plans. One such tool is multiobjective analysis using an integrated hydro-economic model (IHEM). However, IHEM ma...

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Bibliographic Details
Published in:Journal of water resources planning and management 2018-08, Vol.144 (8)
Main Authors: Kiptala, Jeremiah K, Mul, Marloes L, Mohamed, Yasir A, van der Zaag, Pieter
Format: Article
Language:English
Subjects:
Agricultural economics
Agricultural management
Case Studies
Case Study
Catchment area
Catchments
Econometric models
Economic analysis
Economic models
Hydroelectric power
Irrigation
Irrigation water
Landscape
Multiple objective analysis
Optimization
Resource management
River basins
River flow
Rivers
Water resources
Water resources management
Water use
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Summary:AbstractThe concept of integrated water resource management (IWRM) attempts to integrate all elements of water resources. Different tools are developed to assist in developing sound IWRM plans. One such tool is multiobjective analysis using an integrated hydro-economic model (IHEM). However, IHEM mainly deals with the optimization of river flow (blue water) in a river basin. This paper linked a distributed model of green water (landscape water uses) in the upper catchment with mainly blue water uses in the lower catchment of the Pangani Basin. The results show that agricultural water use has the highest water productivity and competes with all other objective functions in the catchment. The generation of firm energy competes with the downstream ecosystem requirements. The integrated study shows that improving rainfed cropping through supplementary irrigation has comparable marginal water values to full-scale irrigation but are much higher compared with hydropower. However, hydropower has more benefits if used in conjunction with the environment. The methodological approach has increased the understanding of trade-offs between green and blue water uses that are highly interdependent in African landscapes.
ISSN:0733-9496
1943-5452
DOI:10.1061/(ASCE)WR.1943-5452.0000960