Climate change effects on water allocations with season dependent water rights
| Autor: | Liana Prudencio, Sarah E. Null |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Hydrology
Environmental Engineering 010504 meteorology & atmospheric sciences 0208 environmental biotechnology 02 engineering and technology 01 natural sciences Pollution 020801 environmental engineering Water year Water resources Water conservation Streamflow Snowmelt Farm water Environmental Chemistry Environmental science Surface runoff Waste Management and Disposal Water right 0105 earth and related environmental sciences |
| Zdroj: | Science of The Total Environment. 571:943-954 |
| ISSN: | 0048-9697 |
| Popis: | Appropriative water rights allocate surface water to competing users based on seniority. Often water rights vary seasonally with spring runoff, irrigation schedules, or other non-uniform supply and demand. Downscaled monthly Coupled Model Intercomparison Project multi-model, multi-emissions scenario hydroclimate data evaluate water allocation reliability and variability with anticipated hydroclimate change. California's Tuolumne watershed is a study basin, chosen because water rights are well-defined, simple, and include competing environmental, agricultural, and urban water uses representative of most basins. We assume that dedicated environmental flows receive first priority when mandated by federal law like the Endangered Species Act or hydropower relicensing, followed by senior agricultural water rights, and finally junior urban water rights. Environmental flows vary by water year and include April pulse flows, and senior agricultural water rights are 68% larger during historical spring runoff from April through June. Results show that senior water right holders receive the largest climate-driven reductions in allocated water when peak streamflow shifts from snowmelt-dominated spring runoff to mixed snowmelt- and rainfall-dominated winter runoff. Junior water right holders have higher uncertainty from inter-annual variability. These findings challenge conventional wisdom that water shortages are absorbed by junior water users and suggest that aquatic ecosystems may be disproportionally impaired by hydroclimate change, even when environmental flows receive priority. |
| Databáze: | OpenAIRE |
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