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Water Users (water + user)

Distribution by Scientific Domains
Life Sciences20%
Humanities and Social Sciences20%
Engineering20%
Business, Economics, Finance and Accounting20%

Terms modified by Water Users

  • water user association
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    Selected Abstracts

    Upscaling water savings from farm to irrigation system level using GIS-based agro-hydrological modelling,

    IRRIGATION AND DRAINAGE, Issue 1 2007
    Shahbaz Khan
    simulation d'irrigation; extrapolation; efficacité d'utilisation de l'eau; économie de l'eau Abstract Irrigation continues to be the main water user on a global scale despite the increase in water use by sectors other than agriculture. More efficient water application technologies and water management practices are ways of realising potential water savings, thus moderating the negative impacts of higher water use on farm incomes and environmental impact on rivers and groundwater systems. This paper describes an integrated approach of agro-hydrological modelling for determining potential water savings achievable by adopting high-tech irrigation technologies at farm level and application of GIS techniques to upscale those benefits at the regional irrigation system level. The SWAP (Soil,Water,Atmosphere,Plant) model was used for the simulation of water use at the farm level. The results are promising, as the potential water saving ranges from 0.1 to 2.2,ML,ha,1 (10,220,mm) for different broad-acre crops, 1.0 to 2.0,ML,ha,1 (100,200,mm) in sprinkler and 2.0 to 3.0,ML,ha,1 (200,300,mm) in drip irrigation for citrus, 1.0 to 1.5,ML,ha,1 (100,150,mm) in sprinkler and up to 4.0,ML,ha,1 (400,mm) in drip irrigation for vineyards and 0.5 to 1.0,ML,ha,1 for vegetables (50,100,mm). SWAP simulations show crop water saving potential of 7% for maize, 15% for soybean, 17% for wheat, 35% for barley, 17% for sunflower and 38% for fababean from the current water use statistics in Australia. Spatial analysis in GIS environment is carried out to investigate the spatial variations of water use for a particular crop under different depths to water table and varying soil types. Maps of water need for all broad-acre crops are drawn and pixel-to-pixel comparison is performed to determine the water saving potential per unit area. The upscaling approach shows that considerable water amounts could be saved both in Murrumbidgee Irrigation Area (MIA) and Coleambally Irrigation Area (CIA) with potential water saving of 36 to 95,GL (MCM) in MIA and 42 to 72,GL (MCM) in CIA. Copyright © 2007 John Wiley & Sons, Ltd. L'irrigation reste l'usage principal de l'eau à l'échelle mondiale en dépit de l'augmentation des volumes utilisés par les secteurs autres que l'agriculture. L'amélioration des techniques d'irrigation et des procédures de gestion de l'eau permet de réaliser des économies d'eau potentielles, modérant ainsi les impacts négatifs d'une surconsommation d'eau sur les revenus agricoles et ses incidences sur l'environnement des cours d'eau et des aquifères. Cet article décrit comment un modèle agro-hydrologique intégré peut déterminer les économies d'eau réalisables grâce à l'adoption de technologies de pointe dans l'irrigation au niveau de l'exploitation agricole et à l'application des techniques de SIG à l'extension de ces avantages au niveau d'un système régional d'irrigation. Le modèle SWAP (Sol-Eau-Atmosphère-Plante) a été employé pour simuler l'utilisation de l'eau au niveau de l'exploitation. Les résultats sont prometteurs car l'économie d'eau potentielle va de 100 à 2 200 m3/ha (10 à 220 millimètres) pour différentes cultures de plein champ, de 1 000 à 2 000 m3/ha (100 à 200 millimètres) en aspersion et de 2 000 à 3 000 m3/ha (200 à 300 millimètres) en goutte à goutte sur des citronniers, de 1 000 à 1 500 m3/ha (100 à 150 millimètres) en aspersion et jusqu'à 4 000 m3/ha (400 millimètres) en goutte à goutte sur de la vigne, et de 500 à 1 000 m3/ha pour des légumes (50 à 100 millimètres). Les simulations de SWAP à partir de données statistiques australiennes courantes montrent un potentiel d'économie d'eau de 7% pour le maïs, 15% pour le soja, 17% pour le blé, 35% pour l'orge, 17% pour le tournesol et 38% pour les fèves. Une analyse par SIG permet d'étudier les variations spatiales de l'utilisation de l'eau pour une récolte particulière selon la profondeur de la nappe et le type de sol. Les besoins en eau de toutes les cultures de plein champ sont cartographiés et le potentiel d'économie d'eau par unité de surface est estimé pixel par pixel. L'extrapolation des résultats montre que des volumes d'eau considérables pourraient être économisés dans les zones irriguées de Murrumbidgee (MIA, économie potentielle de 36 à 95 millions de m3) et de Coleambally (CIA, économie potentielle de 42 à 72 m3). Copyright © 2007 John Wiley & Sons, Ltd. [source]

    ,People Is All That Is Left to Privatize': Water Supply Privatization, Globalization and Social Justice in Belize City, Belize

    INTERNATIONAL JOURNAL OF URBAN AND REGIONAL RESEARCH, Issue 3 2009
    DAANISH MUSTAFA
    Abstract This article presents the findings of an extensive survey on public and policy level perceptions of the failed water supply and sanitation system privatization in Belize City. Drawing upon the burgeoning critical geographical literature on the commodification and privatization of water, we formulate a conceptual framework for analyzing the ethnographic data on perceptions and experience of privatization by Belize City water users. The experience of water supply privatization was largely negative. Residents complained bitterly about an increase in water tariffs and excessive disconnection rates by the privatized Belize Water Supply Limited (BWSL). Many policy makers also accused BWSL of front-loading profits and not making strategic investments in infrastructure. But the symbolic significance of water privatization for the residents of a small Caribbean country like Belize exceeded its practical implications. We argue that the major themes to emerge from the ethnographic data collected for the study can be synthesized into three ,popular privatization narratives' (PPNs). The first was based on the perception that poor governance led to privatization; the second on a preference for national- over global-scale politics, so that objections to privatization were based on nationalism; the third on angst about losing control to the systemic compulsions of neoliberal globalization. Overall the privatization process not only had important (largely negative) material consequences for Belizeans but, given their historical and cultural geography, profound discursive and symbolic consequences for their sense of identity in a condition of neoliberal globalization. Résumé Cet article présente les résultats d'une vaste enquête sur les impressions, de la population et des acteurs des politiques publiques, concernant l'échec de la privatisation du réseau d'approvisionnement en eau et d'assainissement de Belize City. Utilisant les publications géographiques critiques qui se multiplient sur la marchandisation et la privatisation de l'eau, un cadre conceptuel est formulé pour analyser les données ethnographiques sur les impressions et l'expérience de la privatisation émanant des usagers de l'eau de Belize City. L'expérience de cette privatisation a été en grande partie négative. Les habitants se plaignent amèrement de l'augmentation des tarifs et de taux de coupures excessifs par la société privée Belize Water Supply Limited (BWSL). De nombreux décideurs politiques ont également accusé BWSL de prélever les bénéfices sans effectuer d'investissements stratégiques d'infrastructure. Toutefois, la place symbolique de la privatisation de l'eau pour les habitants d'un petit pays de la mer des Antilles comme Belize dépasse les incidences pratiques. Les principaux thèmes dessinés par les données ethnographiques collectées peuvent se résumer en trois ,récits populaires de la privatization'. Le premier repose sur l'impression que la faiblesse de la gouvernance a conduit à la privatisation; le deuxième sur une préférence pour une politique à l'échelon national plutôt que mondial, de sorte que les objections à la privatisation étaient liées au nationalisme; le troisième sur l'angoisse de perdre la maîtrise des pressions systémiques exercées par la mondialisation néolibérale. En général, le processus de privatisation a eu des conséquences matérielles importantes (en grande partie négatives) pour les Béliziens mais aussi, étant donnée la géographie historique et culturelle nationale, de profondes implications discursives et symboliques sur leur sens de l'identité dans un contexte de mondialisation néolibérale. [source]

    Ecohydrology of a seasonal wetland in the Rift Valley: ecological characterization of Lake Solai

    AFRICAN JOURNAL OF ECOLOGY, Issue 3 2009
    Tanguy De Bock
    Abstract The following research describes through an ecohydrological approach, the first assessment of the ecology of Lake Solai, with a particular emphasis on the vegetation. Lake Solai is located 50 km north of Nakuru in the Rift Valley in Kenya at E36°80,,36°84, to N00°05,,00°08,. It is a shallow lake that follows a very peculiar seasonal water regime, and that faces conflicts between agriculture and conservation water users. In the upper catchment, an overview of the agricultural practices was implemented and river water uses were identified to assess river flows. Crops/grassland and woodland/shrubland were the major land uses, covering c. 65% of the catchment. Closer to the lake, vegetation samples were collected around the lake together with samples of environmental factors such as soil and water quality. Thirteen vegetation communities were identified within four main zonations: forest, grassland, river inlet and rocky outcrop. These communities showed abundance, distribution and diversity determined mostly by the human pressures, the flooding periods and the salinity. Cynodon, Cyperus and Sporobolus genera were the most abundant. Résumé La recherche suivante décrit, par une approche éco-hydrologique, la première évaluation de l'écologie du lac Solai, en insistant particulièrement sur la végétation. Le lac Solai est situéà 50 km au nord de Nakuru, dans la vallée du Rift kényane, et ses coordonnées sont 36°80,,36°84E à 00°05,,00°08,N. C'est un lac peu profond qui est soumis à un régime hydrique saisonnier très particulier et qui est confrontéà des conflits entre acteurs agricoles et de conservation de la nature. En amont du bassin, une étude des pratiques agricoles a été effectuée, puis les utilisations de l'eau identifiées pour évaluer les débits des rivières. Les cultures/prairies et les forêts/broussailles étaient les principales utilisations des terres et couvraient environ 65% du bassin versant. Plus en aval, des échantillons de végétation ont été récoltés le long du lac, en même temps que des échantillons de facteurs environnementaux tels que le sol et l'eau. Treize communautés végétales ont été identifiées au sein de quatre zones principales: forêt, prairie, rivière entrante et affleurement rocheux. Ces communautés présentaient une abondance, une distribution et une diversité qui étaient principalement déterminées par les pressions humaines, les périodes d'inondation et la salinité. Les genres Cynodon, Cyperus et Sporobolusétaient les plus abondants. [source]

    Spot water markets and risk in water supply

    AGRICULTURAL ECONOMICS, Issue 2 2005
    Javier Calatrava
    Water markets; Economic risk; Water availability; Irrigated agriculture Abstract Water availability patterns in semiarid regions are typically extremely variable. Even in basins with a highly developed infrastructure, users are subject to unreliable water supplies, incurring substantial economic losses during periods of scarcity. More flexible instruments, such as voluntary exchanges of water among users, can help users to reduce risk exposure. This article looks at the effects of spot water markets on the economic risk caused by water availability variations. Our theoretical and empirical risk analyses are based on the random profits of water users. Profit probability density functions are formally and graphically characterized for both water sellers and buyers under several possible market outcomes. We conclude from this analysis that, where water supply is stochastic, water markets unambiguously reduce both parties' risk exposure. The empirical study is conducted on an irrigation district in the Guadalquivir Valley (Southern Spain), where there is a high probability of periods of extreme water scarcity. Water demand functions for the district representative irrigators and a spatial equilibrium model are used to simulate market exchanges and equilibrium. This programming model is combined with statistical simulation techniques. We show that the profit probability distribution of a representative irrigator is modified if water exchanges are authorized, leading to risk reductions. Results also indicate that if the market were extended to several districts and users that are subject to varying hydrological risk exposure, extremely low-profit events would be less likely to occur. In sum, we show that exchanging water in annual spot markets can reduce farmers' economic vulnerability caused by water supply variability across irrigation seasons. These results support the water policy reform carried out in Spain in 1999 to allow for voluntary water exchanges among right holders. [source]

    Efficient and Practical Approaches to Ground-Water Right Transfers Under the Prior Appropriation Doctrine and the Snake River Example,

    JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION, Issue 1 2008
    Gary S. Johnson
    Abstract:, Water right transfers are one of the basic means of implementing changes in water use in the highly appropriated water resource systems of the western United States. Many of these systems are governed by the Prior Appropriation Doctrine, which was not originally intended for application to ground-water pumping and the conjunctive management of ground water and surface water, and thus creates an administrative challenge. That challenge results from the fact that ground-water pumping can affect all interconnected surface-water bodies and the effects may be immeasurably small relative to surface water discharge and greatly attenuated in time. Although we may have the ability to calculate the effects of ground-water pumping and transfers of pumping location on surface-water bodies, mitigating for all the impacts of each individual transfer is sufficiently inefficient that it impedes the transfer process, frustrates water users, and consequently inhibits economic development. A more holistic approach to ground-water right transfers, such as a ground-water accounting or banking scheme, may adequately control transfer third-party effects while reducing mitigation requirements on individual transfers. Acceptance of an accounting scheme can accelerate the transfer process, and possibly reduce the administrative burden. [source]

    The Water Poverty Index: Development and application at the community scale

    NATURAL RESOURCES FORUM, Issue 3 2003
    C.A. Sullivan
    The article details the development and uses of the water poverty index (WPI). The index was developed as a holistic tool to measure water stress at the household and community levels, designed to aid national decision makers, at community and central government level, as well as donor agencies, to determine priority needs for interventions in the water sector. The index combines into a single number a cluster of data directly and indirectly relevant to water stress. Subcomponents of the index include measures of: access to water; water quantity, quality and variability; water uses (domestic, food, productive purposes); capacity for water management; and environmental aspects. The WPI methodology was developed through pilot projects in South Africa, Tanzania and Sri Lanka and involved intensive participation and consultation with all stakeholders, including water users, politicians, water sector professionals, aid agency personnel and others. The article discusses approaches for the further implementation of the water poverty index, including the possibilities of acquiring the necessary data through existing national surveys or by establishing interdisciplinary water modules in school curricula. The article argues that the WPI fills the need for a simple, open and transparent tool, one that will appeal to politicians and decision makers, and at the same time can empower poor people to participate in the better targeting of water sector interventions and development budgets in general. [source]

    Past and future sustainability of water policies in Europe

    NATURAL RESOURCES FORUM, Issue 3 2003
    Bernard Barraqué
    The article contributes to a discussion on two global issues on water: water resources management, and water supply and sanitation. Focusing on Europe, it traces the legal roots of current systems in history: as a resource, water is considered as a common property, rather than a market good; while as a public service it is usually a commodity. Public water supply and sanitation technologies and engineering have developed under three main paradigms: quantitative and civil engineering; qualitative and chemical/sanitary engineering (both on the supply side); and the most recent one, environmental engineering and integrated management (on the demand side). The cost of public drinking water is due to rise sharply in view of the two-fold financial challenge of replacing an ageing infrastructure and keeping up with ever-rising environmental and sanitary quality standards. Who will pay? Government subsidies, or water users? The author suggests that apparent successes with privatisation may have relied heavily on hidden government subsidies and/or the healthy state of previously installed water infrastructure: past government subsidies are still felt for as long as the lifetime of the infrastructure. The article stresses the importance of public participation and decentralized local management of water and sanitation services. Informing and involving users in water management decisions is seen as an integral part of the ,ethics' side of the crucial three E's (economics, environment, ethics). The article strongly argues for municipal provision of water services, and hopes that lessons learnt and solutions found in the European experience may serve water services management efforts in other regions of the world. [source]

    Resolving Water Conflicts: A Comparative Analysis of Interstate River Compacts

    POLICY STUDIES JOURNAL, Issue 3 2009
    Edella Schlager
    This paper examines compacts used by U.S. western states to engage in shared governance of interstate rivers. Compacts are viewed as inflexible, rigid governance structures incapable of responding to changing environmental and institutional settings because of the use of unanimity rules and the inability to directly regulate water users. Using data from a study of 14 western interstate river compacts we examine this claim. In particular, we explore the response of compacts to water conflicts. We find that members of compacts, closely related water agencies, and compact governments are capable of responding to conflicts. To better understand this finding, we identify the conditions under which compacts are likely to address conflicts, as well as the types of conflict solutions compact governments adopted. [source]

    Surface water balance to evaluate the hydrological impacts of small instream diversions and application to the Russian River basin, California, USA

    AQUATIC CONSERVATION: MARINE AND FRESHWATER ECOSYSTEMS, Issue 3 2009
    Matthew J. Deitch
    1.Small streams are increasingly under pressure to meet water needs associated with expanding human development, but the hydrologic and ecological effects are not commonly described in scientific literature. 2.To evaluate the potential effects that surface water abstraction can have on flow regime, scientists and resource managers require tools that compare abstraction to stream flow at ecologically relevant time scales. 3.The classic water balance model was adapted to evaluate how small instream diversions can affect catchment stream-flow; the adapted model maintains the basic mass balance concept, but limits the parameters and considers surface water data at an appropriate timescale. 4.This surface water balance was applied to 20 Russian River tributaries in north-central California to evaluate how recognized diversions can affect stream flow throughout the region. 5.The model indicates that existing diversions have little capacity to influence peak or base flows during the rainy winter season, but may reduce stream flow during spring by 20% in one-third of all the study streams; and have the potential to accelerate summer intermittence in 80% of the streams included in this study. 6.The surface water balance model may be especially useful for guiding river restoration from a hydrologic perspective: it can distinguish among streams with high diversion regimes that may require more than just physical channel restoration to provide ecological benefits, and can illustrate the extent to which changing the diversion parameters of particular water users can affect the persistence of a natural flow regime. 7.As applied to Russian River tributaries, the surface water balances suggest that reducing demand for stream flow in summer may be as important as physical channel restoration to restoring anadromous salmonids in this region. Copyright © 2009 John Wiley & Sons, Ltd. [source]

    Property rights and western United States water markets,

    AUSTRALIAN JOURNAL OF AGRICULTURAL & RESOURCE ECONOMICS, Issue 1 2009
    Zachary Donohew
    This paper addresses water scarcity issues in the American West and examines the allocation of water through the appropriative rights system and the extent markets are used to reallocate water from low- to high-valued uses. The unique physical properties of water make it difficult to bound and measure, which makes defining property rights difficult. Markets are also impeded by disputes over third-party effects due to the interdependencies of water users and complex institutional arrangements that dilute decision-making authority. Analysis of water trading in the western United States indicates that the rate of permanent transfers is increasing over time and urban users are paying higher prices relative to agricultural users. [source]