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Wedge-shaped and sloping aquifers. Adam Forsberg January 28, 2013. Until Now. Thickness constant Water table horizontal. 3 Cases: W edge shaped confined aquifers at unsteady-state S loping unconfined aquifers at steady-state S loping unconfined aquifers at unsteady-state.

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wedge shaped and sloping aquifers

Wedge-shaped and sloping aquifers

Adam Forsberg

January 28, 2013

until now
Until Now
  • Thickness constant
  • Water table horizontal
  • 3 Cases:
  • Wedge shaped confined aquifers at unsteady-state
  • Sloping unconfined aquifers at steady-state
  • Sloping unconfined aquifers at unsteady-state
wedge shaped confined at unsteady state flow
Wedge-shaped confined at unsteady-state flow
  • Assumptions
    • Thickness of aquifer varies exponentially in direction of flow (x-direction)
      • Constant in y-direction
    • Homogeneous, isotropic
    • Rate of change in aquifer thickness < 0.20 in direction of flow
sloping unconfined aquifers steady state
Sloping, unconfined aquifers steady-state
  • Culmination-point method
    • Slope of the water table = slope of impermeable basement
  • Assumptions
    • Unconfined Aquifer with constant saturated thickness
    • Slopes uniformly in the direction of flow
sloping unconfined aquifers steady state1
Sloping, unconfined aquifers steady-state
  • Flow per unit width
    • F = width where water is drawn
    • α= slope of the impermeable base
  • At some distance from the well, the combined slopes for α and dh/dx will equal zero
    • Inflection or culmination point
sloping unconfined aquifers unsteady state
Sloping, unconfined aquifers unsteady-state
  • Assumptions
    • Unconfined
    • Seeminglyinfinite areal extent
    • Isotropic, homogeneous, and uniform thickness
    • Prior to pumping, the water table slopes in direction of flow with gradient < 0.2
    • Unsteady-state