The groundwater may be from precipitation or from groundwater flowing into the aquifer. As groundwater flows through an aquifer, it is naturally filtered. There are several aquifers contained within the valley including the Las Vegas Aquifer. It was responsible for the Botany Bay Groundwater Plume contamination of a local aquifer. West Tennessee sits on top of an artesian aquifer. The water is mainly supplied by wells that draw from the Floridan aquifer. The pipeline is over long, and is connected to wells tapping an aquifer over underground. These ions enter a water supply by leaching from minerals within an aquifer. There innovative system uses a series of wells, linked to a large underground aquifer. Withdrawals from the Ogallala Aquifer for irrigation amounted to in 2000. Most of the Miami metropolitan area obtains its drinking water from the Biscayne Aquifer. Water is available from a Cretaceous period aquifer. The resulting borrow pits impacted the fresh-water aquifer. Under the table lies an aquifer contained in marl. Amarillo's water supply used to come from both from Lake Meredith and the Ogallala Aquifer.