GROUNDWATER FLOW VELOCITIES FOR THE DEEP ARTESIAN PORTION OF THE EDWARDS AQUIFER, NEAR COMAL SPRINGS, TEXAS
Over 80 participants, representing four countries and more than 15 public and private entities monitored thirty surface sites and three municipal wells, and collected and analyzed over 1,600 water samples. A trace from the 200 m deep flowing artesian well (with a head about 15 feet above ground level) yielded flow velocities of 290 m/d to springs 350 750 m away, and demonstrated conduit flow in the deep artesian zone. The dye emerged from rise points in a 400 m stretch of the middle of Landa Lake as described by Martels (1896) underground delta model. Dye was also detected in a municipal well 300 m from the dye injection point. A second dye, simultaneously injected into a 25 m deep well on the up thrown side of the fault, moved at 1400 m/d to a separate set of rise points at the springs.