Multi-purpose projects | Full of purpose
The value of converting single purpose reservoirs into multi-use ones is being investigated in the US. There is also major potential for storage-fed irrigation in many places where dams are currently mostly used for hydropower, while conflicting user issues are being addressed in Hungary
THE DEVELOPMENT OF A new framework is looking to enhance the dual functionality of some of the US Army Corps of Engineers’ (USACE) reservoirs. With single- purpose flood control reservoirs described as ‘falling short’ when it comes to addressing the escalating demands for diverse water resource management, the study aims to ensure those reservoirs initially designed for flood control, will also be able to support water supply through the determination of maximum safe water levels (MSWLs). The findings by Mingda Lu and Venkatesh Merwade in in the Journal of the American Water Resources Association, illuminate the intricate balance required between managing flood risks and enhancing water supply, indicating that precise operational adjustments can significantly improve reservoir sustainability and efficiency.
“This method,” the authors state, “offers a viable pathway to convert single purpose reservoirs into multi-purpose reservoirs, meeting growing water demands while ensuring robust flood mitigation, and making a step toward better water utilisation.” With most of the Army Corp’s dams and reservoirs being constructed since the 1900s, with an average age of 61 years, over time there have been significant impacts on sediment transport, runoff coefficient, and regional evapotranspiration. These have led to reservoir underperformance due to changes in watershed and climate conditions. In turn, such underperformance is likely to result in the degradation of water resources management for flood control, hydropower generation, and water supply and can further socioeconomically impact stakeholders and investors.
Right: Resource gaps for hydropower and irrigation water storage will be focalised in few regional hotspots. Comparing projections to demands for hydropower in 2050s low-carbon energy systems (from IEA, a, b) and required irrigation storage with the technical hydropower potential for hydropower and storage (from FHRED) highlights where potentials exceed demand (surplus: green) and vice-versa (deficit: purple). Note that the analysis is performed on a country level for hydropower (as power is commonly transmitted on a country level) and on a basin level for irrigation. Basin level (a) and country level (b) data for hydropower demand were downscaled from regional projections. https://doi. org/10.1016/
j.rser.2024.114439
22 | December 2024 |
www.waterpowermagazine.com
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