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Universidade do Minho (2018)

Assessment of sustainable efficiency (sefficiency) and water allocation under uncertainty in Kano River basin

Ahmad, Muhammad Tajuri

Titre : Assessment of sustainable efficiency (sefficiency) and water allocation under uncertainty in Kano River basin

Auteur : Ahmad, Muhammad Tajuri

Université de soutenance : Universidade do Minho

Grade : Doctoral Thesis Civil Engineering 2018

The ever-increasing population and climate change have placed a considerable pressure on Kano city water supply (KCWS) and Kano River Irrigation Project (KRIP), major water users on Kano River, the most upstream tributary of Yobe River flowing directly to Lake Chad which is an important transboundary basin in West Africa. Under water scarcity and competing water uses, improved knowledge of the performance of water use systems (WUS) is essential for policy formulation and sustainable development of water sector. This study is carried out in semi-arid Kano River basin of Nigeria, where water is a limiting factor, but a comprehensive knowledge on the performance of different water users across the basin are lacking. The main objective is to assess the performance of main water users and provide a thorough analysis of the impacts of drivers of change on their performances using new and innovative methodological framework called Sefficiency (Sustainable efficiency). However, crop requirements were estimated using CROPWAT 8.0. In evaluating KRIP, two major stakeholders were contacted, namely, farmers and water managers and their views on the value of water flows were registered through interviews. The results indicated that useful consumption relative to effective consumption of farmers is significantly lower than management, showing a higher relative consumptive impact on both KRIP and Kano River. Also, the useful outflow per unit of useful inflow is lower according to the farmers relative to the managers. Classical efficiency in use globally gives much lower values than meso-efficiency. The synthesis of the results for Kano River model reveals that effective consumption that is useful consumption is lower relative to beneficial consumption which is an indication of pollution that increases effective consumption and consequently decreases efficiency. The difference between beneficial inflow and beneficial consumption indicated that water consumption is through non-reusable water flow paths that do not consider quality, i.e., evaporation. Moreover, beneficial consumption efficiency is lower than inflow efficiency due to a combination of relatively high return flow and pollution impact. The low value of MicroEs suggests that the WUS itself is not efficient in using its water resources


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