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Emergy evaluation perspectives of an irrigation improvement project proposal in China

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  • Chen, Dan
  • Webber, Michael
  • Chen, Jing
  • Luo, Zhaohui

Abstract

Emergy theory and method are used to evaluate the feasibility of an irrigation improvement project in China and its contribution to local agricultural development. An emergy method for evaluating the costs and benefits of the project and a composite index named the emergy cost-benefit ratio (EmCBR) were developed. The emergy evaluation shows that the major costs associated with the proposed project come from earthwork (77.4% of the total cost) and concrete work (15.4%), and that water saving (43.0% of the total benefit) and agricultural yield increase (56.9%) are the most important contributions. The calculated EmCBR is 0.97 (the lowest value for a feasible project is 1.0) which indicates that this project would not be feasible in emergy terms. The regional agricultural system could not benefit from the proposed project, according to several emergy indices: emergy yield ratio (EYR), emergy investment ratio (EIR), environmental load ratio (ELR) and environmental sustainability index (ESI). The results show that conventional cost-benefit analysis could fail to provide an adequate decision-making framework because it is unable to value resources and environmental impacts properly. More additional emergy evaluations should be completed on other alternatives to the proposed project to provide adequate guidelines for selecting the best alternative that contributes most to agricultural development with limited environmental impact.

Suggested Citation

  • Chen, Dan & Webber, Michael & Chen, Jing & Luo, Zhaohui, 2011. "Emergy evaluation perspectives of an irrigation improvement project proposal in China," Ecological Economics, Elsevier, vol. 70(11), pages 2154-2162, September.
    • Handle: RePEc:eee:ecolec:v:70:y:2011:i:11:p:2154-2162
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    1. Pang, Mingyue & Zhang, Lixiao & Ulgiati, Sergio & Wang, Changbo, 2015. "Ecological impacts of small hydropower in China: Insights from an emergy analysis of a case plant," Energy Policy, Elsevier, vol. 76(C), pages 112-122.
    2. Qin Tu & Hong Li & Xinkun Wang & Chao Chen & Yin Luo & Frank Dwomoh, 2014. "Multi-Criteria Evaluation of Small-Scale Sprinkler Irrigation Systems Using Grey Relational Analysis," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 28(13), pages 4665-4684, October.
    3. Dai, Xiaoping & Han, Yuping & Zhang, Xiaohong & Chen, Jing & Li, Daoxi, 2017. "Development of a water transfer compensation classification: A case study between China, Japan, America and Australia," Agricultural Water Management, Elsevier, vol. 182(C), pages 151-157.
    4. Fonseca, Ana Margarida P. & Marques, Carlos A.F. & Pinto-Correia, Teresa & Guiomar, Nuno & Campbell, Daniel E., 2019. "Emergy evaluation for decision-making in complex multifunctional farming systems," Agricultural Systems, Elsevier, vol. 171(C), pages 1-12.

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