Optimization of Pumping Costs and Harvested Volume for a Stormwater Harvesting System
Publication: Journal of Water Resources Planning and Management
Volume 144, Issue 8
Abstract
A harvested stormwater and managed aquifer recharge system has been analyzed through both simulation sensitivity analysis and optimization to reduce operational pumping costs and increase the volume of water harvested. The simulation sensitivity analysis explored increasing the size of a storage tank, replacing the three harvesting pumps, and using wider tank trigger levels in the system operation. In the optimization, trigger levels and irrigation schedules were considered as decision variables. Various streamflow (input) series have been considered in the optimization by finding the optimal controls for each individual series or by finding the controls that best perform under a range of different conditions. Optimal controls for the current system were compared with those found for the system with new replacement pumps. The newly sized pumps were found to provide significant benefits by reducing pump operating costs by 50% and increasing the volume of water able to be harvested. Using wider tank trigger levels and altering the irrigation schedule so that the irrigation pump operated at a more efficient point also resulted in a small reduction in cost for the current system.
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Acknowledgments
This research was supported by an Australian Government Research Training Program Scholarship as well as the Commonwealth of Australia through the Cooperative Research Centre program. This research was part of the CRC for Water Sensitive Cities Project C5.1 (Intelligent Urban Water Networks) and was supported by funding for postdoctoral research and a Ph.D. top-up scholarship. The authors would like to thank Matthew Sanderson (City of Unley) for providing information on the case study system presented in this paper.
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Information & Authors
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Published In
Journal of Water Resources Planning and Management
Volume 144 • Issue 8 • August 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jun 24, 2017
Accepted: Feb 27, 2018
Published online: Jun 11, 2018
Published in print: Aug 1, 2018
Discussion open until: Nov 11, 2018
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