The Valley’s water supply
Groundwater recharge Another contributor to our water resource mix is groundwater from two underground storage facilities, the Granite Reef Underground Storage Project (GRUSP) and the New River-Agua Fria River Underground Storage Project (NAUSP). These storage sites store the water in an aquifer; a porous layer of underground rock that can hold and release water when it’s needed. During wet years, extra water is stored underground
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