A dynamic water accounting framework based on marginal resource opportunity cost

Tilmant, Amaury; Marques, Guilherme Fernandes; Mohamed, Yasir A.

doi:10.5194/hess-19-1457-2015

Cited by 17 publications

(12 citation statements)

References 19 publications

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“…Several authors (Molden and Sakthivadivel, 1999;Momblanch et al, 2014;Tilmant et al, 2015;Pedro-Monzonís et al, 2016) pointed out that the first handicap of water accounting is the spatial and temporal aggregation. Regarding the spatial consideration, this research has considered the whole territory of Jucar RBD, but it could be possible to apply this approach at each of the nine water exploitation systems that conforms the Jucar RBD.…”

Section: Discussionmentioning

confidence: 99%

“…But building water accounts represents a complex task, due to the difficulty of the collection of the required data and, on the other hand, due to the lack of common European procedures (Dimova et al, 2014;Tilmant et al, 2015;Pedro-Monzonís et al, 2016). Because of the difficulty of monitoring the components of the water cycle and the water management in a territory, hydrological models and Decision Support Systems (DSSs) have become an indispensable tool to provide the required data.…”

Section: Introductionmentioning

confidence: 99%

“…This requirement contrasts with the fact that, traditionally, water has been typically allocated according to historical, political, legal, institutional and social conditions (Harou et al, 2009). In this sense, one of the purposes of water accounts is to measure the influence of each water user, infrastructure and management decision to the total economic value of water resources in a given basin (Tilmant et al, 2015). Taken it into account, in many places, the available economic data do not fit the format of water accounts and, in these cases, hydroeconomic models can help provide this information, advancing on transparency and efficiency in water use (Harou et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Water accounting for stressed river basins based on water resources management models

Pedro-Monzonís

Solera

Ferrer³

et al. 2016

Science of The Total Environment

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A comprehensive study aimed at evaluating the occurrence, significance of concentrations and spatial distribution of priority pollutants (PPs) along the Comunidad Valenciana coastal waters (Spain) was carried out in order to fulfil the European Water Framework Directive (WFD). Additionally, PPs concentrations were also analysed in the effluent of 28 WWTPs distributed along the studied area, since these infrastructures are usually considered a significant point source of many of these toxic substances.In coastal waters 36 organic pollutants of the 71 analysed, including 26 PPs (8 of them priority hazardous substances) were detected although many of them with low frequency of occurrence. Only 13 compounds, which belong to four different classes (VOCs, organochlorinated pesticides, phthalates and tributyltin compounds (TBT)) showed a frequency of occurrence above 20% in coastal waters. Toluene was the most ubiquitous pollutant (detected in 100% of the samples) with maximum concentration of 1.6 g/l. All analysed coastal waters showed the presence of PPs, being di(2-ethylhexyl)phthalate (DEHP) the most frequent one (detected in 57% of the samples) reaching concentrations up to 15 g/l. In the results obtained until now, there are four compounds that exceed the established Environmental Quality Standards (EQS): octylphenol, pentachlorobenzene, DEHP and TBT exceeded the annual average concentration (EQS-AAC), and only TBT surpassed the maximum allowable concentration (EQS-MAC).Despite its prohibition, endosulfan and hexachlorocyclohexane (HCH) were detected in 9% and 30% of the samples, respectively, and their concentrations were relatively close to their EQS-AAC value (around the 70 %). The most frequent contaminants determined in coastal waters were also present in WWTP's effluents. Generally, effluents from WWTPs exhibited higher frequency of occurrence and concentration than in coastal waters, except for DEPH.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Water accounting for stressed river basins based on water resources management models

Pedro-Monzonís

Solera

Ferrer³

et al. 2016

Science of The Total Environment

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“…The analytical valuation of carryover storage (Draper & Lund, ; You & Cai, ) is limited to cases with a few reservoirs. Dual values from optimization with SDDP have been used to approximate the economic value of water storage in large‐scale systems with hydrological uncertainty (Tilmant et al, , ) or for water accounting (Tilmant et al, ). Yet this is only applicable in the absence of significant groundwater abstractions that introduce nonconvexities if the head dependence of pumping costs is included.…”

Section: Introductionmentioning

confidence: 99%

Estimating the Economic Value of Interannual Reservoir Storage in Water Resource Systems

Khadem

Rougé

Harou

et al. 2018

Water Resources Research

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Reservoir operators face pressures on timing releases of water. Releasing too much water immediately can threaten future supplies and costs, but not releasing enough creates immediate economic hardship downstream. This paper examines how the economic valuation of end‐of‐year carryover storage can lead to optimal amounts of carryover storage in complex large water resource systems. Economic carryover storage value functions (COSVFs) are developed to represent the value of storage in the face of interannual inflow uncertainty and variability within water resource optimization models. The approach divides a perfect foresight optimization problem into year‐long (limited foresight) subproblems solved sequentially by a within‐year optimization engine to find optimal short‐term operations. The final storage state from the previous year provides the initial condition to each annual problem, and end‐of‐year COSVFs are the final condition. Here the COSVF parameters that maximize the interannual benefits from river basin operations are found by evolutionary search. This generalized approach can handle nonconvexity in large‐scale water resources systems. The approach is illustrated with a regional model of the California Central Valley water system including 30 reservoirs, 22 aquifers, and 51 urban and agricultural demand sites. Head‐dependent pumping costs make the optimization problem nonconvex. Optimized interannual reservoir operation improves over more cautious operation in the historical approximation, reducing the average annual scarcity volume and costs by 80% and 98%, respectively, with more realistic representation of hydrologic foresight for California's Mediterranean climate. The economic valuation of storage helps inform water storage decisions.

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“…3). This bulk water charge system is based on a dynamic water accounting framework presented by Tilmant et al (2015).…”

Section: Collection Of Bulk Water Chargesmentioning

confidence: 99%

Sharing water and benefits in transboundary river basins

Arjoon

Tilmant

Herrmann

2016

Hydrol. Earth Syst. Sci.

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Abstract. The equitable sharing of benefits in transboundary river basins is necessary to solve disputes among riparian countries and to reach a consensus on basin-wide development and management activities. Benefit-sharing arrangements must be collaboratively developed to be perceived not only as efficient, but also as equitable in order to be considered acceptable to all riparian countries. The current literature mainly describes what is meant by the term benefit sharing in the context of transboundary river basins and discusses this from a conceptual point of view, but falls short of providing practical, institutional arrangements that ensure maximum economic welfare as well as collaboratively developed methods for encouraging the equitable sharing of benefits. In this study, we define an institutional arrangement that distributes welfare in a river basin by maximizing the economic benefits of water use and then sharing these benefits in an equitable manner using a method developed through stakeholder involvement. We describe a methodology in which (i) a hydrological model is used to allocate scarce water resources, in an economically efficient manner, to water users in a transboundary basin, (ii) water users are obliged to pay for water, and (iii) the total of these water charges is equitably redistributed as monetary compensation to users in an amount determined through the application of a sharing method developed by stakeholder input, thus based on a stakeholder vision of fairness, using an axiomatic approach. With the proposed benefit-sharing mechanism, the efficiency-equity trade-off still exists, but the extent of the imbalance is reduced because benefits are maximized and redistributed according to a key that has been collectively agreed upon by the participants. The whole system is overseen by a river basin authority. The methodology is applied to the Eastern Nile River basin as a case study. The described technique not only ensures economic efficiency, but may also lead to more equitable solutions in the sharing of benefits in transboundary river basins because the definition of the sharing rule is not in question, as would be the case if existing methods, such as game theory, were applied, with their inherent definitions of fairness.

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A dynamic water accounting framework based on marginal resource opportunity cost

Cited by 17 publications

References 19 publications

Water accounting for stressed river basins based on water resources management models

Water accounting for stressed river basins based on water resources management models

Estimating the Economic Value of Interannual Reservoir Storage in Water Resource Systems

Sharing water and benefits in transboundary river basins

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