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Social cost-benefit analysis of investment in rehabilitation of multipurpose small reservoirs in northern Ghana using an ecosystem services-based approach
Ecosystem Services ( IF 7.6 ) Pub Date : 2021-06-30 , DOI: 10.1016/j.ecoser.2021.101329
Joseph Bekoe , Bedru B. Balana , Fred Nimoh

Multipurpose small reservoirs are essential infrastructure in providing water for irrigation and non-irrigation uses in water stress areas of northern Ghana. Unfortunately, the flow of multiple ecosystem services from small reservoirs have been declining over several years due to lack of rehabilitation and poor management. Using selected multipurpose small reservoirs and available secondary and survey data, this paper applied an ecosystem services-based approach in the economic analysis of investment in rehabilitation of small reservoirs in northern Ghana. The findings reveal that private financial returns from irrigated crops have negative net present value (NPV) and an internal rate of return (IRR) lower than the cost of capital, implying a lack of economic incentive for private investors in their rehabilitation. However, accounting for the multiple ecosystem services such as livestock watering, fisheries, recreation services, domestic water, and climate regulation show positive NPV and high return on capital (IRR up to 43%). Policy choices would be biased against reservoir development if stakeholders consider only irrigation benefits. Based on the findings we recommend public investment in rehabilitation of multi-purpose small reservoirs to harness the multiple ecosystem services and community livelihoods. We further recommend public–private-user partnership business model to address current management inefficiency and optimize the flows of ecosystem services from small reservoirs to wider community.



中文翻译:

使用基于生态系统服务的方法对加纳北部多功能小型水库修复投资的社会成本效益分析

多功能小型水库是为加纳北部缺水地区提供灌溉和非灌溉用水的重要基础设施。不幸的是,由于缺乏恢复和管理不善,小型水库的多种生态系统服务流量多年来一直在下降。本文使用选定的多用途小型水库和可用的二级和调查数据,将基于生态系统服务的方法应用于加纳北部小型水库修复投资的经济分析。调查结果显示,灌溉作物的私人财务回报具有负净现值 (NPV) 和低于资本成本的内部回报率 (IRR),这意味着私人投资者在恢复过程中缺乏经济激励。然而,考虑到多种生态系统服务,例如牲畜饮水、渔业、娱乐服务、生活用水和气候调节,显示出正 NPV 和高资本回报率(IRR 高达 43%)。如果利益相关者只考虑灌溉效益,政策选择就会偏向于水库开发。根据调查结果,我们建议对多功能小型水库的修复进行公共投资,以利用多种生态系统服务和社区生计。我们进一步推荐公私用户合作商业模式,以解决当前管理效率低下的问题,并优化从小水库到更广泛社区的生态系统服务流。气候监管显示正 NPV 和高资本回报率(IRR 高达 43%)。如果利益相关者只考虑灌溉效益,政策选择就会偏向于水库开发。根据调查结果,我们建议对多功能小型水库的修复进行公共投资,以利用多种生态系统服务和社区生计。我们进一步推荐公私用户合作商业模式,以解决当前管理效率低下的问题,并优化从小水库到更广泛社区的生态系统服务流。气候监管显示正 NPV 和高资本回报率(IRR 高达 43%)。如果利益相关者只考虑灌溉效益,政策选择将不利于水库开发。根据调查结果,我们建议对多功能小型水库的修复进行公共投资,以利用多种生态系统服务和社区生计。我们进一步推荐公私用户合作商业模式,以解决当前管理效率低下的问题,并优化从小水库到更广泛社区的生态系统服务流。根据调查结果,我们建议对多功能小型水库的修复进行公共投资,以利用多种生态系统服务和社区生计。我们进一步推荐公私用户合作商业模式,以解决当前管理效率低下的问题,并优化从小水库到更广泛社区的生态系统服务流。根据调查结果,我们建议对多功能小型水库的修复进行公共投资,以利用多种生态系统服务和社区生计。我们进一步推荐公私用户合作商业模式,以解决当前管理效率低下的问题,并优化从小水库到更广泛社区的生态系统服务流。

更新日期:2021-06-30
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