Excelsior Springs, Missouri Well Field CRA [30.7 kb]
The shape of the total CRA for the Excelsior Springs, Missouri well field is circular, has an approximate diameter of 2 kilometers with an arm extending northward into the Fishing River alluvial valley for approximately 3 kilometers for all pumping, river stage scenarios. The long northern arm of the total CRA was caused by the interception of water by the well field as it moved downgradient toward the Missouri River. The extent of the total CRA is controlled by the alluvial valley walls to the north acting as a flow barriers and by Cooley Lake which supplies water to the well field through induced recharge. The 1-year CRA is non-existent for all scenarios indicating low pumping rates. The 5-year CRA is centered around the well field for all scenarios. Part of the 5-year CRA is next to Cooley Lake for the LPLR, HPLR and QUASI scenarios and indicates induced recharge. A small part of the 5-year CRA is located north of the well field in the Fishing River alluvial valley for the QUASI and HPLR scenarios. This was caused by the presence of a high--hydraulic-conductivity sand at that location which allowed water to enter the lower parts of the aquifer where it then travelled more quickly to the well field. The 10-year CRA is centered around the well field and has a small northern part in the Fishing River alluvial valley for all scenarios and a small part also is located near Cooley Lake for the LPLR, QUASI, HPLR, and HPHR scenarios. The 100-year CRA extends toward Cooley Lake to the west and up the Fishing River alluvial valley to the north for all scenarios. The 100-year CRA is divided into two parts for the LPLR and QUASI scenarios because of the presence of a low hydraulic conductivity clay at the surface that limited the rate of water movement downward into the lower parts of the aquifer. The 1000-year CRA is located to the north of the well field in the Fishing River alluvial valley for all scenarios.
Simulated pumping rates for the Excelsior Springs, Missouri well field ranged from 4,332 m3/day for the low pumping scenario to 7,216 m3/day for the high pumping scenario. The total CRA ranged from 3.309 km2 for the LPLR scenario to 8.483 km2 for the HPHR scenario. The total CRA increased with increased river stage and increased with increased pumping for all pumping, river stage scenarios.
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Brian P. Kelly, Hydrologist
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/excel.htm