Estimation of the recharge area contributing water to a pumped well in a glacial-drift, river-valley aquifer

Abstract

FIGURES 1. Block diagram showing the generalized geologic setting for glacial-drift, river-valley aquifers 4 Contents III 2. Block diagram showing recharge-discharge relations and flow patterns in glacial-drift, river-valley aquifers 5 3-5. Diagrams showing groundwater flow at various stages of aquifer development: 3. Natural equilibrium conditions before pumping 6 4. Early pumping conditions 6 5. Late pumping conditions at equilibrium 6 6. Diagram of a pumping well showing a cross-sectional view of the cone of depression and a plan view of the area of influence 7 7. Diagram of a pumping well showing a cross-sectional view of the zone of contribution and a plan view of the contributing area 8 8. Block diagram showing the geohydrologic features of the hypothetical aquifer used in figure 9 to illustrate the difference between the area of influence and the contributing area of a pumped well 8 9. Maps of the hypothetical aquifer, illustrated in figure 8, showing prepumping flow net, steady-state drawdowns and the area of influence of a pumped well, and flow net and contributing area for pumping conditions 10 10-12. Diagrams showing: 10. A, Head distribution for a natural-flow system; fi, Drawdowns caused by a pumping stress; and C, Head distribution resulting from superposition of A and B 11 11. The geohydrologic features of the hypothetical stratified-drift, rivervalley aquifer addressed in the model analyses 13 12. An idealized version of the aquifer for analysis with an analytical model using a line-source river boundary 15 13. Maps of the idealized aquifer showing, A, Prepumping water-table altitudes; B, Drawdowns computed by using the analytical model; and C, Water-table altitudes and contributing area resulting from superposition of A and B for the line-source river-boundary condition 16 14. Finite-difference grid used for the two-dimensional numerical-model analyses shown in plan and cross-sectional views 17 15-17. Maps showing: 15. Contributing areas for a well pumping 0.25 million gallons per day in a river-valley aquifer 18 16. Average steady-state water-table altitudes, without pumping, computed by using the two-dimensional numerical model 19 17. Water-table altitudes and contributing areas of a well pumped at 0.5, 1.0, and 2.0 million gallons per day 20 18. Graphs showing sizes of contributing areas and sources of water pumped from the well as a function of well discharge 21 19. Maps showing water-table altitudes and contributing areas of a well pumped at 1.0 million gallons per day for 0.5 times average, average, and 1.5 times average recharge 23 20. Graphs showing sizes of contributing areas and sources of water pumped from the well as a function of recharge rate 24 21. Maps showing water-table configuration and contributing area of a well pumped at 1.0 million gallons per day after 30, 90, and 180 days of drought 25 22. Maps showing water-table altitudes and contributing areas of a well pumped at 1.0 million gallons per day and having streambed coefficients (k'lb'} of 0.1, 1.0, and 10.0 26 23. Graphs s...

Simulation of zones of groundwater contribution to wells south of the Naval Weapons Industrial Reserve Plant in Bethpage, New York

“…One boundary that may be used is a plume shell delineation, typically an isoconcentration surface. "ZOC" is defined as the three-dimensional volumetric part of an aquifer through which groundwater flows to a well from the area contributing recharge (modified from Morrissey, 1989). …”

Evaluation of factors that influence estimated zones of transport for six municipal wells in Clark County, Washington

“…The effects of several of these factors have been investigated by other workers (Barlow, 1989;Morrissey, 1989). The principle factors evaluated in this study were well discharge rate, aquifer transmissivity, well interference, and porosity.…”

Delineation of contributing areas to selected wells in Ingham County, Michigan

“…The zone of contribution to a pumping well is defined as the land-surface projection of the three-dimensional volume of water flowing to the pumping well (Morrissey, 1989). That three-dimensional volume includes the surficial contributing recharge area and any subsurface zones of contribution.…”