C2 Water - Aquifer Storage and Recovery - ASR
Aquifer Storage and Recovery
Storing excess water for the dry season
Aquifer storage and recovery (ASR) is a technique which has been developed for collecting water during times of plentiful rainfall (wet season), storing this underground in an aquifer, and recovering the stored water for reuse during times of water scarcity (dry season).
How it works
C2 Water uses aquifer storage and recovery in combination with other techniques such as subsurface desalination as part of an overall water management plan, combining excess rainfall with permeate from subsurface desalination, injecting this collected water underground in an aquifer, and recovering the injected water during dry periods when water is required.
If the aquifer contains brackish water of poor quality, ASR produces a subsurface storage of fresh water within the aquifer for later reuse. Although some injected freshwater mixes with poorer quality groundwater, this decreases over time with successive injection cycles, and groundwater quality overall can improve as salinity decreases locally. Subsurface desalination also becomes more efficient as groundwater feed to the reverse osmosis system decreases in salinity.