Application of Extenics in Evaluation of Utilization Degree of Irrigation Water

Abstract

The utilization degree of irrigation water is the key indicator of agricultural water-saving efficiency. Currently, water efficiency of irrigation is used to reflect the utilization degree of irrigation water, people commonly uses hydrodynamic measurement and static water measurement, but the result is still affected by many factors. This thesis is based on the method of extenics that combines with various kinds of irrigated area characteristics, realizes the comprehensive evaluation of irrigation and irrigation water utilization. And a simple example shows that is more reasonable compared with traditional methods.

Improving the effectiveness of aid: an evaluation of prospective Mekong irrigation investments

“…Consequently, governments in many developing countries continue to outline plans to expand investments in irrigation to increase their chances of meeting United Nations Sustainable Development Goals around food security and poverty alleviation (Turral, Svendsen, & Faures, 2010). However, recent evaluations suggest that investments in irrigation are not always economically viable, especially when funded by user charges to recover high operation and maintenance costs, leading to low infrastructure utilization (Cao, Zhu, Liu, & Yang, 2014;Chen, Luo, Webber, Chen, & Wang, 2014;Molle, 2008;van de Walle & Gunewardena, 2001). Additionally, negative environmental impacts downstream of irrigated catchments, such as reduced fisheries productivity, can make irrigation investments less attractive (Costanza et al, 2011;MRC, 2009;Orr, Pittock, Chapagain, & Dumaresq, 2012).…”