Sometimes referred to as “water banking,” Aquifer Storage generally involves diverting water from one source (usually a surface-water source, or a natural or man-made underground aquifer) to an underground storage area or tank for later retrieval and use. Aquifer storage is utilized to better meet the needs of fluctuating water supply and demand. The main “water banking” methods are Aquifer Storage and Recovery (ASR), and Artificial Recharge (AR). Aquifer storage and recovery is the method of storing water in an aquifer during periods when water is readily available (typically during winter) and retrieving it during times of low water supply. Artificial recharge is the process of adding water to an aquifer for restoring and managing groundwater resources. For both methods, the HDDW method is an ideal solution.
Aquifer storage with HDDW: higher storage capacity
Aquifer storage typically requires a suitable aquifer with at least two thermal wells installed within it. Additional components may include heat exchangers and transport piping, along with systems and controls necessary for integration into an existing heating and/or cooling system. A distinct advantage of utilizing the innovative HDDW technique in an aquifer storage project is that HDDW provides money and energy savings in the long term as a result of being able to achieve a much higher storage capacity than other existing aquifer storage methods.
Both cold and warm water aquifer storage are possible
Although applications typically involve the storage and recovery of cold water, warm water storage is also used in instances where excess heat available during the summer months from a source such as solar panels. During cold weather, groundwater can be pumped through a standard heat exchanger to lower its temperature using the colder, outside air and then stored in a designated “cold store” portion of an aquifer. The chilled groundwater is later drawn from the cold store during summer months and used for cooling. In some cases, after the water has been used for cooling and it becomes warmed up in the process, it can be injected into a designated “warm store” portion of the aquifer. This cycle may be repeated seasonally and results in substantial water and energy conservation.