The authors' approach revolves around drawing from the two layers of the stratified reservoir water, balancing the mix of oxygenated shallower water and nutrient-rich deeper water. The authors note that though technology exists to re-oxygenate depleted reservoir water, the necessary equipment is often expensive to operate and maintain. Using a biogeochemical model of nutrient cycling, the authors calculate that by using a mix of water from around 13 meters (43 feet) depth and from more than 30 meters (about 100 feet) depth from the Itezhi-Tezhi Reservoir, they could maximize the nutrient load while avoiding releasing hypoxic water.
Source: Water Resources Research, doi:10.1002/wrcr.20358, 2013 http://onlinelibrary.wiley.com/doi/10.1002/wrcr.20358/abstract
Title: Optimizing turbine withdrawal from a tropical reservoir for improved water quality in downstream wetlands
Authors: Manuel J. Kunz, David B. Senn, Bernhard Wehrli and Alfred West: Eawag: Swiss Federal Institute of Aquatic Science and Technology, Surface Waters Research and Management, Kastanienbaum, Switzerland, and Institute of Biogeochemistry and Pollutant Dynamics, Zurich, Switzerland;
Elenestina M. Mwelwa: Hydrology Department, ZESCO Limited, Lusaka, Zambia.
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