An operational definition of water demand management is proposed with five components: (1) reducing the quantity or quality of water required to accomplish a specific task; (2) adjusting the nature of the task so it can be accomplished with less water or lower quality water; (3) reducing losses in movement from source through use to disposal; (4) shifting time of use to off-peak periods; and (5) increasing the ability of the system to operate during droughts. This definition brings out the drivers of water saving and permits the tracking of gains by the source of the saving. It is applicable to nations at different stages of economic development. It also shows how goals of greater water use efficiency are linked to those of equity, environmental protection and public participation. Taken together, these goals make water demand management less a set of techniques than a concept of governance.
Low-salinity water injection is an emerging IOR/EOR technique, applicable to mixed-to-oil-wet sandstone reservoirs. This paper describes the field response for two large fields: Omar (secondary flood) and Sijan (tertiary flood). The data were analyzed using analytical and numerical modelling tools. This included evaluation of scaling numbers, mixing and dispersion and calibration. Insight was obtained on relevant drive mechanisms.
The responses to low-salinity flooding differ for the two fields: In Omar, a dual-step water-cut development was observed, which is characteristic for a change in wetting state. Our interpretation is that in this field, viscous forces provide the dominant drive mechanism, which is favorable to low-salinity flooding. We were able to history match the low-salinity response using a simple conceptual model.In Sijan, the low-salinity flood appears to be still immature and breakthrough of low-salinity water has not (yet) been observed. The reasons for the muted response thus far are explored, including a rather strong buoyancy effect caused by the higher permeability of the block, and the significant effect of injectant mixing with the highly saline aquifer.
A proposal is made for a workflow on how to apply this analysis to future low-salinity flooding implementation in field cases.
This article focuses on the somewhat ambiguous concept of scarce water, or, more accurately stated, on the rather more ambiguous concept of scarcity. Still today, water scarcity in a region is defined largely in physical terms, typically gallons or cubic metres per capita if a stock or per capita-year if a flow. However useful purely physical measures may be for broad comparisons, they cannot adequately reflect the variety of ways in which human beings use water -neither to their wastefulness when water is perceived as abundant nor to their ingenuity when it is not. This article argues that water scarcity should be defined according to three orders of scarcity that require, respectively, physical, economic and social adaptations. It goes on to demonstrate that perceiving scarcity mainly in physical terms limits opportunities for policymaking and approaches for capacity building.
Because of its importance in the sustainable development of rural communities, rural tourism has been frequently studied as an alternative form of economic development in rural areas. In the United States, many rural communities rely on tourism for economic growth to compensate for declines in manufacturing, agriculture, extraction of natural resources, and population. Although there is an increased interest in developing rural tourism in many countries, there is little information regarding the motivations of rural tourists in the United States. Therefore, this study aims to understand travel motivations and characteristics of tourists visiting a rural destination to provide a better understanding of rural tourism in the United States. Our study site, Potter County, Pennsylvania, represents a typical American rural area with a population of 18,080, which is currently struggling to pursue economic revitalization by attracting tourists. The findings of this study indicated that visitors to Potter County do not fit a homogenous rural tourist profile due to their broad travel preferences. The findings also suggest that “tourism in rural areas” may be a better descriptor than “rural tourism” in the context of Potter County, Pennsylvania.
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