Water Resources and Economics最新文献

Drought is one of the main limiting factors affecting crop production in many areas in the world. Pressurized irrigation systems enable more efficient use of water compared to surface irrigation systems but are rarely used by small farmers due to higher initial investment and energy costs. The main question investigated in the study is if remittances affect investment in pressurized irrigation (drip or sprinkler irrigation systems). A quantitative questionnaire survey was conducted among 234 small-scale farmers in the Republic of Moldova in 2016. The main result of the binary probit regression model revealed that remittances increased the likelihood of utilization of pressurized irrigation facilities in the study region. This study further contributes to a better understanding of factors that affect farmers’ adoption of pressurized irrigation systems. This knowledge helps policy makers and development organizations shape proper measures to increase the diffusion of this technology and thus the adaptation of smallholder farmers to climate risks.

Drip irrigation is claimed to save water and fertilizers and improve land productivity. Considerable recent evidence supports the water-saving effect of drip irrigation techniques, but little attention has been given to the effect on fertilizer savings and land productivity improvement. This study examines the effects of collective and individual drip irrigation (CDI and IDI, respectively) on fertilizer use intensity and land productivity. Using a multinomial endogenous switching treatment regression and a survey dataset collected in Awati County, Xinjiang, we found that (1) on average, CDI reduces fertilizer use intensity by 10.31%, but IDI increases it by 5.57%; and (2) compared to IDI, CDI improves land productivity by more than 13.65%. Moreover, based on quantitative analyses, we found that (3) a high frequency of mutual adjustment of fertigation (an information coordination mechanism) gives CDI these advantages. The policy implications are to continue the top-down promotion of CDI technology and strengthen the information coordination on fertigation during the operation of CDI systems.

Almost 800 million people lack access to basic water supply, and almost 2000 million lack access to sanitation. Therefore, achieving universal access remains a crucial goal of the global development agenda. In order to shed light on whether international aid might help accomplish that goal, this study evaluates its impact in a sample of 121 developing countries during 1990–2015. A new approach is adopted in which aid affects access not only through provision of infrastructure (supply) but also through health education (demand). Additionally, the long-held concern about the persistence of impacts over time is addressed by estimating panel vector autoregressive models (PVAR). The results show that both supply- and demand-side interventions financed by aid can contribute to promoting access to water, but consistent long-term investments are needed.

Human demand for adequate water resources and supplies has been and will continue to be a fundamental issue in the 21st century due to rapid population growth, growing economies and globalization, and increasing water pollution, among others. Water withdrawals in regions which are already encountering scarcity will impose intensifying pressure on water resources locally and globally, threatening the achievement of long-term sustainable development targets. Decoupling has increasingly been recognized and incorporated in policy making as a way to reconcile limitless economic growth with environmental pressures. Filling evident literature gaps, the current state and projected future decoupling factors of water withdrawals in relation to GDP are assessed through decoupling and regression analyzes for 155 countries and 12 potential socioeconomic development pathway scenarios. Findings suggest that average levels of water withdrawal decoupling are moderate in 2025 but will increase throughout the century in all countries. By 2075, average water withdrawal decoupling becomes common and widespread, with high decoupling factors across the world. Yet, some countries and regions will continue to lag behind in this development. GDP growth is the most significant driver of water withdrawals. Climate and regional differences among countries are major influential factors on decoupling outcomes, more so than current country-level income group classification. Altogether, these results are of high significance to water resource managers and policy actors, offering a chance to act proactively to change the course on global water resource and country-specific development. In this way, decoupling provides a pathway to a more water-wise world.

Assessing the possible locations and evaluating the spatial distribution of hydropower potentials at the global and regional scale is crucial for planning future energy development activities. This study assesses run–of–river-based hydropower potential and evaluates potential sites under technical, economic, and environmental constraints globally. The study used the recent (1965–2014) global runoff dataset (0.5° x 0.5° resolution) for design discharge computation and 90 m × 90 m resolution Digital Elevation Model (DEM) covering 90°N-60°S for topographical analysis. The design discharges (Q_d) calculated for 30%, 75%, and 95% flow dependability were used in the assessment and evaluations. Further, the economic feasibility of identified potential sites was evaluated by developing empirical relations derived from the observed cost of electromechanical equipment to corresponding head (H) and installed power (P). Globally a theoretical hydropower potential of 25.48 Peta watt-hours per year (PWh/yr) at 95% flow dependability to 184.17 PWh/yr at 30% flow dependability was estimated. The energy ranges from 7.06 PWh/yr to 49.05 PWh/yr are technically feasible for the design discharge calculated from 95% to 30% flow dependability, respectively. After excluding environmentally unsuitable and economically less competitive (Levelized Cost of Electricity (LCoE) > US$ 0.1/kWh) potential sites, it was estimated that an exploitable hydropower potential of 5.42 PWh/yr at 95% flow dependability to 39.56 PWh/yr at 30% flow dependability would be available globally.

During the 2011–2017 drought in California, water providers used a variety of demand-side management (DSM) policies to successfully reduce water consumption by over 20%. Unfortunately, because utilities used numerous conservation policies simultaneously, little is known about support for specific policies—specifically, an untested water-budgeting policy wherein utilities gave households an allotment of water and charged higher prices for water used in excess of the budget. California recently legislated mandatory long-term reductions in water usage. It is therefore critical to obtain a better understanding of which policies, including water budgeting, have strongest public support, and to understand how the drought experience changed residents' water use behaviors, attitudes, beliefs, habits, and personal capabilities surrounding conservation. This work surveyed individuals residing in northern California, the “North State,” during a period of severe drought. We used best-worst scaling to determine households’ preferences for DSM policies; asked households how their water use behaviors changed; and evaluated psychological attitudes toward drought and water conservation. Results show the vast majority of households changed their water use behaviors during the drought. Over two-thirds of respondents never exceeded their water budgets and said they would continue to conserve after the state lifted conservation requirements. Respondents preferred water budgets relative to more familiar DSM policies, a result with implications for forecasting future water demand. Last, our survey finds only minor differences in policy preferences for respondents with different demographics and attitudes toward water use, even for variables (e.g., income) that previous literature has found to have disparate welfare effects across users.

Access to safe water sources remains scarce in sub-Saharan African countries. We estimate the economic value of safe water from newly constructed boreholes in rural Zambia. Our quasi-experimental setting allows us to estimate the revealed preference measure of new safe water sources in a causal way, empowered by precise information on water collection and distance to new facilities. We show that the share of time value for water collection in total expenditures was about 10% at the baseline survey, which was reduced to about 3% at the end-line survey, but the difference-in-differences analysis reveals that the project did not reduce the time burden for collecting water due to the greater demand for safe water. The main net benefit of the project lies in improved productivity due to decreased diarrhea incidence among working-age adults. The estimated internal rate of return of the project is not large. However, the project is likely to have additional dynamic health benefits due to the decrease in disability-adjusted life years (DALYs), corresponding to 192.3 USD per DALY and 6.88 USD per household.

This study aims to analyze the effects of local water market formation in a limited region of the Gavkhuni Basin, located in the center of Iran. An economic optimization mathematical model, called ‘inter-sectoral water exchanges programming’ (IWEP), is developed to address the study objectives. The proposed model seeks to maximize the net benefit of participating agents in the water market mechanism. This model can determine the scope of production activities and the monthly volume of water exchange through different technical methods of water transfer. Results demonstrate that the agriculture sector contributes to an increase in the productions of the agriculture industries and building industries through selling its surplus water. Although farm agents sell only 1% of their groundwater permits to industrial agents, the total net benefit of the agents is increased by more than 30%, compared to when the water market is not implemented. The shared aquifer method, based on common pool groundwater resources, is identified as a suitable technical method for water transfer in the groundwater markets. Finally, the socio-hydrological analysis of groundwater exchanges reveals that the inter-sectoral water market at the local scale can increase the region's employment rate by 45% and mitigate more pressure on the aquifer to meet water demands in the industry sector. These results clarify the efficient role of market-based groundwater allocation approach under water scarcity conditions.

The value and vulnerability of salt marshes has led to efforts to ensure their preservation, including the preservation of marsh transgression zones (uplands onto which marshes can migrate) and restrictions on shoreline armoring. Coastal armoring involves the placement of hardened structures such as revetments and bulkheads along the shoreline. These structures can prevent coastal marshes from migrating onto adjacent uplands as sea levels rise, thereby causing marsh loss over time. Hence, efficient targeting of efforts to ensure marsh sustainability requires an understanding of where and why coastal armoring is likely to occur. This article develops a random utility model that characterizes residential landowners’ shoreline armoring decisions for beachfront and non-beachfront residential property, focusing on whether armoring is influenced by features related to marsh migration. The model is illustrated using parcel-level data from Accomack County, Virginia with armoring observations on each parcel for two time periods, 2002 and 2013. Independent models for the two time periods suggest that landowners in the case study area do not tend to construct armoring in ways that impede marsh migration—all else equal armoring is less likely to occur in areas suitable for marsh migration. Rather, armoring appears to be motivated primarily by factors associated with shoreline erosion risk such as high wave energy.