An Artesian Well in Riverside Park
In Wisconsin, United States
Size:  (not chosen)
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Welcome to the artesian well located in Riverside Park along the Kiwanis Trail.
A well whose source of water is a confined (artesian) aquifer. The water level in artesian wells stands at some height above the water table because of the pressure (artesian pressure) of the aquifer. The level at which it stands is the potentiometric (or pressure) surface of the aquifer. If the potentiometric surface is above the land surface, the well is a flowing artesian well.
An Artesian Well is a deep drilled well through which water is forced upward under pressure. The water in an artesian well flows from an aquifer, which is a layer of very porous rock or sediment, usually sandstone, capable of holding and transmitting large quantities of water. The geologic conditions necessary for an artesian well are an inclined aquifer sandwiched between impervious rock layers above and below that trap water in it. Water enters the exposed edge of the aquifer at a high elevation and percolates downward through interconnected pore spaces. The water held in these spaces is under pressure because of the weight of water in the portion of the aquifer above it. If a well is drilled from the land surface through the overlying impervious layer into the aquifer, this pressure will cause the water to rise in the well. In areas where the slope of the aquifer is great enough, pressure will drive the water above ground level in a spectacular, permanent fountain.
The artesian well at the south end of Riverside Park was drilled in 1939. The well is drilled to a depth of 940' and cased with pipe to a depth of 280'. It provided uninterrupted drinking water for the community for over 50 years.In the 1990's its flow became sporadic in nature. In 2007, the city had the well televised and determined that there is no blockage or damage to the well pipe. They have concluded that deep well water consumption by Janesville's municipal wells along with regional usage by other communities have reduced the ground pressure which forces the water out of the well.
In order to log this cache you must email the owner with the following information: flow of the well in gal/min, shape and dimensions of basin. If water is not flowing please also indicate the 'Marker #' located near GZ. (Optional) - please try to include a photo of yourself visiting the site.
Many thanks to Tom Presny, Janesville Parks Director for the information and help with this EarthCache.
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Last Updated: on 9/1/2015 4:31:49 PM Pacific Daylight Time (11:31 PM GMT)
Coordinates are in the WGS84 datum