Aquifer storage and recovery, or ASR, is the process of injecting or pumping treated water into an underground aquifer, where it is stored so that it can be used at a later time. In some locations, water can be directed to natural recharge zones instead of mechanically injected.
During times of plenty, extra water can be stored underground so that it can be used during drought or other similar circumstances.
The supply source for ASR can be surface water from rivers, treated wastewater, groundwater from other aquifers, or even captured stormwater runoff.
With reasonable restrictions on when water is allowed to be taken from its source and injected underground, ASR can be a reliable water supply strategy that minimizes evaporation for Texas’ hotter, drier future. It can also help communities prepare for drought by “banking” water for later use.