Wednesday, October 17, 2007

Comal Springs (Texas)

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Only a small portion of total springflow comes from the largest springs shown in the graphic above. Special springflow measurements made by the U.S. Fish and Wildlife Service and the U.S. Geological Survey determined that most of the spring flows (about 78%) come from the many small springs and seeps under and around the shores of Landa Lake (McKinney and Sharp, 1995). Most of the water that becomes Comal springflow originates with recharge far to the west of the Springs and moves through major flow zones in Medina and Bexar counties on its way toward New Braunfels (see Flowpath Map). In five ground-water trace tests performed by Ogden, Quick, and Rothermel (1986) around Comal Springs, none of the dye appeared at any of the spring orifices. This supported earlier hypotheses that very little recent, locally derived recharge waters emerge from Comal Springs.
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The Comal Springs, the largest group of natural springs in Texas, is on the northwestern edge of New Braunfels in southeastern Comal County (at 29°41' N, 98°08' W). After filtering through the Edwards and associated limestones, the springs' artesian flow issues from several fissures along the Comal Springs fault and feeds Landa Lake and the Comal River.
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