Tri-County Water Company Well Field CRA [37.3 kb]
The shape of the total CRA for the Tri-County Water Company well field is roughly oval for the low river stage and QUASI scenarios, extends approximately 4.5 kilometers from the well field to the west, and is approximately 2 kilometers wide. The shape of the total CRA for the HPLR scenario extends into a buried alluvial channel approximately 5.5 kilometers to the south and is approximately 1 kilometer wide. The shape of the total CRA for the HPHR scenario is divided into two arms. The divide occurs approximately 2.5 kilometers to the south west of the well field where the aquifer splits between the main aquifer and the buried alluvial channel to the south. The western arm extends approximately 3 kilometers and the southern arm extends approximately 4 kilometers from the divide.
The extent of the total CRA for all scenarios is controlled on the south edge by the alluvial valley walls acting as a flow boundary and by the Missouri River supplying water to the well field from the east. The long up gradient extent of the total CRA was caused by the interception of ground water by the well field as it moved down gradient toward the Missouri River.
The long upgradient extent of the total CRA for all pumping, river stage scenarios was caused by the capture of ground water as it flowed down gradient toward the Missouri River. The 1-year CRA is located next to the Missouri River for all pumping, river stage scenarios and indicates that the well field induced recharge from the Missouri River. The 5-year CRA is centered around the well field but skewed to the west in the upgradient direction. The 10-, 100- and 1000-year CRAs extend toward the west or south west for all scenarios.
Simulated pumping rates for the Tri-County Water Company range from 4,257 m3/day for the low pumping scenarios to 7,095 m3/day for the high pumping scenarios. The total CRA ranged from 5.535 km2 for the LPLR scenario to 10.621 km2 for the HPLR scenario. The total CRA decreased with an increase in river stage and increased with an increase in well pumping for all pumping, river stage scenarios.
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U.S. Geological Survey
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Updated: September 5, 2003
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URL: http://missouri.usgs.gov/indep/kelly/mo-alluvial-gw/cra/tricnty.htm