Community
Water Company Well Field CRA [37.9 kb]
The shape of the total CRA for the Community Water company well field is long and relatively narrow for both of the low river stage scenarios and the QUASI scenario, extends into the Little Blue River valley approximately 6.5 kilometers due south of the well field and is 0.25 to 0.5 kilometer wide. The shape for the LPHR scenario is a smaller oval that extends toward the Missouri River and is approximately 2.5 kilometers long and 1 kilometer wide. The shape of the total CRA for the HPHR scenario is elongated to the south and divided into two arms approximately 1.5 kilometers south of the well field. One arm extends south for 4.5 kilometers from the divide and the other arm extends to the southwest for almost 3 kilometers from the divide.
The relatively long narrow shape of the total CRA for the LPLR, HPLR, and QUASI scenarios was caused by the interception of ground water by the Community Water Company well field as it moved down gradient toward the Missouri River. The absence of a 1- or 5-year CRA and the fact that the total CRA does not intersect the Missouri River for these scenarios indicates the relatively small effect pumping of this well field has on ground-water flow. The increase of river stage increases the effect of pumping on the shape of the total CRA because the regional ground water gradient near the well field becomes lower. The increase of river stage for the low-pumping scenarios moved the total CRA from the long narrow shape for the LPLR scenario to the smaller shorter shape of the LPHR scenario. The increase of river stage for the high-pumping scenarios caused the total CRA from the HPLR scenario to expand for the HPHR scenario to include an additional arm to the southwest. The branching of the total CRA for the HPHR scenario was caused by the presence of a low-hydraulic-conductivity silty-clay deposit in the aquifer at that location and represented in layer 3 of the model.
Simulated pumping rates for the Community Water Company well field ranged from 852 m3/day for the low pumping scenarios to 1,420 m3/day for the high pumping scenarios. The total CRA ranged from 1.396 km2 for the LPHR scenario to 3.173 km2 for the HPHR scenario.
The total CRA for the Community Water Company well field increased with increased pumping, decreased with increased river stage for the low pumping scenarios, and increased with increased river stage for the high pumping scenarios. The 1- and 5- year CRAs were absent for all pumping, river stage scenarios indicating relatively low pumping from the well field. The 10-year CRA existed for only the QUASI and HPLR scenarios and was centered around the well field.
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Brian P. Kelly, Hydrologist
U.S. Geological Survey
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Updated: September 4, 2003
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