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Analytical model for aquifer response incorporating distributed stream leakage.
Garey A Fox1, Paul DuChateau, Deanna S Durnford
1Department of Civil Engineering, Colorado State University, Fort Collins 80523-1372, USA. gfox@engr.colostate.edu
Ground Water
|July 13, 2002
Summary
A new analytical model predicts aquifer drawdown considering stream width and leakage. This model offers more accurate estimates for aquifer and streambed parameters compared to previous methods.
Area of Science:
- Hydrogeology
- Environmental Engineering
- Water Resource Management
Background:
- Stream-aquifer interaction is crucial for understanding groundwater flow and contaminant transport.
- Existing analytical models often simplify stream geometry, potentially leading to inaccuracies in drawdown predictions.
Purpose of the Study:
- To develop an analytical model for stream/aquifer interaction that accounts for finite stream width and leakage.
- To predict aquifer drawdown induced by pumping from a well near a stream.
Main Methods:
- Formulation of an analytical solution based on stream partial penetration, a semipervious streambed, and distributed recharge.
- Comparison with previous stream/aquifer analytical models using dimensionless drawdown profiles.
Main Results:
- The proposed model predicts less drawdown in aquifers near wide streams than models ignoring stream width.
- Deviations increase with stream width; equivalence to prior solutions occurs when stream-aquifer distance to stream width ratio exceeds 25.
Conclusions:
- The developed analytical solution provides a more refined approach to modeling stream/aquifer systems.
- This model can improve estimates of aquifer and streambed leakage parameters through field data analysis.