scholarly journals Economic size and water use efficiency: an empirical analysis of trends across China

Water Policy ◽  
2021 ◽  
Author(s):  
Lishuo Guo ◽  
Xing Li ◽  
Lifang Wang

Abstract Water shortage is a global risk that could arguably be mitigated using water more efficiently. However, the profound relationship between water use efficiency and regional economic size has not been empirically tested. The research design employed an exploratory empirical analysis done through non-linear curve function and attempted to analyze the evolution of water use efficiency over economic growth. First, the water use efficiency change was decomposed into pure technical efficiency change, scale efficiency change, and technological advance change. Second, the scale efficiency is generally less than 1, revealing that it is the main reason for the decreased water use efficiency by the empirical analysis of trends across China. Third, the fitting function between water use efficiency and economic development was constructed. The results supported the existence of an inverted-S shape between water use efficiency and regional economic growth. This analysis will be the reference to formulate scenarios for economic and demographic growth coupled with water use, particularly for planning and managing future water provision and demand.

Author(s):  
Marta García-Mollá ◽  
Rosa Puertas ◽  
Carles Sanchis-Ibor

AbstractClimate change and increased competition for water resources are generating growing concern about how to improve water-use efficiency in agriculture. In turn, this has prompted substantial investments in the installation of water-saving technologies in irrigation systems. The first aim of this research is to use data envelopment analysis to quantify, in terms of gross water savings (GWS), the local-scale efficiency of the irrigation policies adopted in an area of Spain suffering from a structural water deficit. Second, the cross-efficiency method is used to produce a ranking of the irrigation organizations analysed, in order to identify patterns of water-use efficiency performance that can guide future lines of investment. The results reveal that water-use efficiency prior to modernization is a key determinant of the efficiency achieved in terms of GWS at local scale. However, the investments targeted at irrigation modernization often have objectives other than water savings. These and other aspects should be taken into account when allocating public funds to irrigation modernization.


Author(s):  
Min Li ◽  
Kaisheng Long

The spatial relationship between water use efficiency and water scarcity has been widely discussed, but little attention has been paid to the impact of the pure technical and scale efficiencies of water use on water scarcity. Using input-oriented data envelopment analysis (DEA) and panel spatial Durbin models (SDM), the direct and spillover effects of different water use efficiencies on water scarcity from 2007 to 2016 in China were examined at the regional scale. The results show that the water use pure technical efficiency had significantly negative direct effects on water scarcity; however, the water use scale efficiency did not have a similar effect. The improvement in water use pure technical efficiency in one region could aggravate the water scarcity in neighboring regions through spatial spillover effects, but the same effect was not observed between the water use scale efficiency and water scarcity. Finally, we propose solutions to improve the water use efficiency to reduce the water scarcity.


2020 ◽  
Author(s):  
Diana Carolina Callejas Moncaleano ◽  
Saket Pande ◽  
Luuk Rietveld

<p><strong> </strong>Diana Carolina Callejas Moncaleano<sup>a</sup> , Saket Pande<sup>a</sup> and Luuk Rietveld<sup>a</sup></p><p><sup>[email protected]</sup><sup>; </sup><sup>[email protected]</sup><sup>; [email protected]</sup></p><p><sup>a</sup>Delft University of Technology, Department of Water Management, the Netherlands</p><p>Keywords:</p><p>Water use efficiency</p><p>Human behaviour</p><p>Contextual and psychological factors</p><p>Every day a large amount of water is extracted from inland surface (rivers, lakes, wetlands, reservoirs) and aquifers for agriculture, domestic, electricity, and industrial purposes. In semi-arid and arid regions, high water demand can lead water scarcity, and in other areas causes rapid depletion of water tables. One reason behind the over extractions and higher demand is the inefficient use of water</p><p>Water use efficiency has been a matter of concern to diverse scholars, water managers, and policymakers, as it affects the well-being of society and the economic growth of countries. In many countries, it becomes a priority policy; indeed, increasing water use efficiency is one of the pillars of sustainable development goals (SDG 6.4.1.).However, the slow progress of water efficiency remains, due to the water demand is likely to rise still higher, especially for many developing countries where the degradation of natural resources is critical, economic growth is slow, and there are not strong institutions for coordinate actions. </p><p>Across the spectrum of water users, there are a variety of contextual and psychological factors behind water use inefficiency. Researchers have identified the importance of associated these factors in influencing user's behaviour. The contextual factors investigated are social, economic, environmental, and institutional, and assessments focus on study causes of the water inefficiency, and what are the perceptions and attitudes of water users to adopt water-saving practices, and regulations.  Yet, none of these studies consider a holistic view of these factors in shaping water use behaviour.</p><p>The understanding of water inefficiency requires, firstly exploration of connections between factors. Second, understanding how these influence the human behaviour of stakeholders and the decisions that they make as water users or water managers. A comprehensive assessment of these factors and their relationships is needed to provide insights on the causalities of over-extraction, the interdependence between stakeholders, and water use inefficiency. In this regard, a holistic view of a framework that incorporates the effects of know-how, linkages between stakeholders, such as water users, water managers, and institutions on water use efficiency, is absent.</p><p>This paper aims to study the gaps in our understanding of human water behaviour underlying water use efficiency from socio-cultural, economic, psychological, and institutional factors. This research proposes a conceptual model that connects contextual and behavioural factors and represents the prior causal- effect relationships between water users and institutions.</p><p> </p>


Author(s):  
Ethel Ansaah Addae ◽  
Nelson Amowini

This paper presents the assessment of improvement in water use efficiency in sub-Sahara Africa based on the Malmquist Productivity Index (MPI). The study was conducted in 28 countries in sub-Sahara Africa from 2007 to 2017. Two test cases comprising data with water stress as undesired output, and without water stress as undesired output were analyzed to determine their level of impact on the improvement of water use efficiency. Again the technical efficiency as well as technological efficiency change were also examined. The overall mean outcome of the results regarding the test case of the MPI with the inclusion of water stress was 0.969 which is higher than the values recorded from 2012-2016. Comparing the two results, it was observed that the mean MPI estimates without water stress are much higher than that of the average MPI with the inclusion of water stress. This means that without the inclusion of undesirable factors such as water stress, the MPI scores could be overestimated. In terms of the catch-up effect, all sampled countries were technically efficient except Angola, Burundi, Chad, Madagascar, Mauritania, Mozambique, Sierra Leone and Togo that could not meet the efficiency frontier of 1.00. With the technological efficiency change, the results indicated that none of the sampled countries was able to reach the efficiency frontier. Policy recommendations based on the results are provided.


2018 ◽  
Vol 76 (2) ◽  
pp. 115-130 ◽  
Author(s):  
G Guo ◽  
K Fang ◽  
J Li ◽  
HW Linderholm ◽  
D Li ◽  
...  

2016 ◽  
Vol 6 (1) ◽  
pp. 822-832
Author(s):  
Halim Mahmud Bhuyan ◽  
Most. Razina Ferdousi ◽  
Mohammad Toufiq Iqbal ◽  
Ahmed Khairul Hasan

Utilization of urea super granule (USG) with raised bed cultivation system for transplanted boro (winter, irrigated) rice production is a major concern now days. A field experiment was conducted in the chuadanga district of Bangladesh to compare the two cultivation methods: deep placement of USG on raised bed with boro rice, and prilled urea (PU) broadcasting in conventional planting. Results showed that USG in raised bed planting increased grain yields of transplanted boro rice by up to 18.18% over PU in conventional planting. Deep placement of USG in raised bed planting increased the number of panicle m-2, number of grains panicle-1 and 1000-grains weight of boro rice than the PU in conventional planting. Better plant growth was observed by deep placement of USG in raised bed planting compared to PU in conventional planting. Sterility percentage and weed infestation were lower on USG in raised bed planting compared to the PU in conventional planting methods. Forty seven percent irrigation water and application time could be saved by USG in raised bed planting than PU in conventional planting. Deep placement of USG in bed saved N fertilizer consumption over conventional planting. Water use efficiency for grain and biomass production was higher with deep placement of USG in bed planting than the PU broadcasting in conventional planting methods. Similarly, agronomic efficiency of N fertilizer by USG in bed planting was significantly higher than the PU broadcasting in conventional planting. This study concluded that deep placement of USG in raised bed planting for transplanted boro rice is a new approach to achieve fertilizer and water use efficiency as well as higher yield and less water input compared to existing agronomic practices in Bangladesh.


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