Lake
City Well Field CRA [36.3 kb]
The shape of the total CRA for the Lake City Army Ammunition Plant well field changes significantly between each of the pumping, river stage scenarios. The extent of the total CRA is limited by the alluvial valley walls of the Little Blue River alluvial valley to the north and west, the walls of the abandoned Missouri River alluvial valley now occupied by Fire Prairie Creek to the east, areas of low vertical hydraulic conductivity, and local drainage.
The effect of river stage on the shape of the total CRA is evident in the comparison between the low river stage scenarios with the high river stage scenarios. Low river stage scenarios have total CRAs divided into multiple parts. The areas between these CRAs do not contribute water to the well field. High river stage scenarios have undivided total CRAs. The most probable explanation for this is the change in ground-water gradient and flow direction between the low river stage scenarios and the high river stage scenarios in the vicinity of the well field. During the low river stage scenarios, the total CRAs for the well field extend to the Little Blue River indicating induced recharge as a source of water. The divide between the northern and southern total CRAs were caused by lower pumping rates for wells located in that area which allowed the eastward flow of shallow ground water to Fire Prairie Creek where it eventually discharged. During the high river stage scenarios, the total CRAs are undivided because the low regional ground-water gradient in the vicinity of the well field decreased the lateral movement of water eastward toward Fire Prairie Creek and increased the effect of well pumping on the potentiometric surface creating a very broad but shallow cone of depression.
Simulated pumping rates for the Lake City Army Ammunition Plant well field ranged from 3,055 m3/day for the low pumping scenarios to 5,092 m3/day for the high pumping scenarios. the total CRA ranged from 3.173 km2 for the QUASI scenario to 10.779 km2 for the HPHR scenario. The total CRA increased with increased river stage and increased pumping rates for all pumping, river stage scenarios.
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Brian P. Kelly, Hydrologist
U.S. Geological Survey
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Lee's Summit, MO 64086
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Updated: September 4, 2003
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