8 long unpumped observation well reilly problem

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Unformatted text preview: ...............................................8 Fully Penetrating Pumped Well in Ideal Confined Aquifer (Lohman Problem) ..................8 Long, Unpumped Observation Well (Reilly Problem) .............................................................8 Partial Penetration ..............................................................................................................................10 Seepage Face ......................................................................................................................................19 Constraints on Pumping Rate ...........................................................................................................21 Flowing Wells: Special Application of Constraints on Pumping Rate ........................................27 Pump Capacity.....................................................................................................................................28 Horizontal and Slanted Wells............................................................................................................31 Well Screen Variability.......................................................................................................................36 Flow Routing in Borehole ..................................................................................................................39 Solute Transport ..................................................................................................................................39 Code Efficiency....................................................................................................................................40 Summary and Conclusions .........................................................................................................................41 Acknowledgments .......................................................................................................................................42 References Cited..........................................................................................................................................42 Appendix 1—Data Input Instructions for Multi-Node Well (MNW2) Package .................................45 Appendix 2—Selected Input Data and Printed Results for Sample Problem....................................55 Appendix 3—Program to Convert MNW1 Input Data to MNW2 Input Data .....................................65 Figures 1. Schematic cross section showing flow patterns that can be induced by a multiaquifer well and simulated by the MNW2 Package.......................................................2 2. Schematic horizontal cross section (plan view) through a vertical well in a finitedifference cell showing some of the factors affecting computed well loss.......................5 3. Semilog plot showing comparisons between drawdowns computed numerically using MODFLOW and drawdowns computed using the Theis (1935) analytical solution ...........................................................................................................................................9 4. Conceptual diagram showing geometry and boundaries for three-dimensional test problem with a nonpumping multi-node well .................................................................10 5. Map view of MODFLOW finite-difference grid showing location of fine grid area and of the nonpumping multi-node well in the Reilly test problem ....................................10 6. Calculated head distribution in vertical section near well on plane of symmetry...........11 v 7. Schematic cross-sectional diagram showing fully and partially penetrating wells in a nonleaky confined aquifer .................................................................................................11 8. Semilog plots of dimensionless drawdown in a vertical pumping well with an open interval centered vertically in a nonleaky, homogeneous, isotropic, confined aquifer, showing the sensitivity of the analytical solution to the partial penetration fraction....................................................................................................................12 9. Plots showing the relation of dimensionless drawdown to penetration fraction for a vertical pumping well in a nonleaky, homogeneous, isotropic, confined aquifer, for wells located vertically in the middle of the aquifer and at the edge of the aquifer ...............................................................................................................................13 10. Drawdown due to partial penetration effects in a vertical pumping well that is open to 33 percent of the saturated thickness of the aquifer, showing sensitivity to the vertical position of the well screen within the aquifer..............................................13 11. Plot showing comparisons of analytical and numerical solutions for dimensionless drawdown for selected cases for the Lohman problem ......................................................15 12. Schematic cross-sectional diag...
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This document was uploaded on 01/20/2014.

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