Evaluation of a Stream Aquifer Analysis Test Using Analytical Solutions and Field Data

: Considerable advancements have been made in the development of analytical solutions for predicting the effects of pumping wells on adjacent streams and rivers. However, these solutions have not been sufficiently evaluated against field data. The objective of this research is to evaluate the predictive performance of recently proposed analytical solutions for unsteady stream depletion using field data collected during a stream/aquifer analysis test at the Tamarack State Wildlife Area in eastern Colorado. Two primary stream/aquifer interactions exist at the Tamarack site: (1) between the South Platte River and the alluvial aquifer and (2) between a backwater stream and the alluvial aquifer. A pumping test is performed next to the backwater stream channel. Drawdown measured in observation wells is matched to predictions by recently proposed analytical solutions to derive estimates of aquifer and streambed parameters. These estimates are compared to documented aquifer properties and field measured streambed conductivity. The analytical solutions are capable of estimating reasonable values of both aquifer and streambed parameters with one solution capable of simultaneously estimating delayed aquifer yield and stream flow recharge. However, for long term water management, it is reasonable to use simplified analytical solutions not concerned with early-time delayed yield effects. For this site, changes in the water level in the stream during the test and a varying water level profile at the beginning of the pumping test influence the application of the analytical solutions.

[1]  J. Sharp,et al.  On the relationship between river-basin geomorphology, aquifer hydraulics, and ground-water flow direction in alluvial aquifers , 1992 .

[2]  B. Hunt,et al.  A Stream Depletion Field Experiment , 2001, Ground water.

[3]  Zekâi Şen,et al.  Determination of Hydraulic Conductivity from Complete Grain‐Size Distribution Curves , 1993 .

[4]  B. Hunt.  Unsteady Stream Depletion when Pumping from Semiconfined Aquifer , 2003 .

[5]  A. Calver.  Riverbed Permeabilities: Information from Pooled Data , 2001, Ground water.

[6]  Vitaly A. Zlotnik,et al.  Interpretation of Slug and Packer Tests in Anisotropic Aquifers , 1994 .

[7]  Bruce Hunt,et al.  Unsteady Stream Depletion from Ground Water Pumping , 1999 .

[8]  John A. Cherry,et al.  A Field Exercise on Groundwater Flow Using Seepage Meters and Mini-piezometers , 1979 .

[9]  A. Springer,et al.  Spatial and Temporal Variability of Hydraulic Conductivity in Active Reattachment Bars of the Colorado River, Grand Canyon , 1999 .

[10]  J J Butler,et al.  Drawdown and Stream Depletion Produced by Pumping in the Vicinity of a Partially Penetrating Stream , 2001, Ground water.

[11]  Thomas Nyholm,et al.  Flow depletion in a small stream caused by ground water abstraction from wells. , 2002, Ground water.

[12]  M. Sophocleous.  Interactions between groundwater and surface water: the state of the science , 2002 .

[13]  H. Bouwer,et al.  A slug test for determining hydraulic conductivity of unconfined aquifers with completely or partially penetrating wells , 1976 .

[14]  M. K. Landon,et al.  Comparison of Instream Methods for Measuring Hydraulic Conductivity in Sandy Streambeds , 2001, Ground water.

[15]  Paul DuChateau,et al.  Analytical model for aquifer response incorporating distributed stream leakage. , 2002, Ground water.

[16]  M. S. Hantush,et al.  Wells near streams with semipervious beds , 1965 .

[17]  Vitaly A. Zlotnik,et al.  Stream depletion predictions using pumping test data from a heterogeneous stream–aquifer system (a case study from the Great Plains, USA) , 2003 .

[18]  J. Tindall,et al.  Hydrologic and Geochemical Effects on Oxygen Uptake in Bottom Sediments of an Effluent-Dominated River , 1995 .