Final Project

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Final Project
From USGS Hydrologic Atlas online
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Conceptual Model of the flow system
Recharge
Recharge
Playa
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Layers
The problem of dry cells and re-saturation
Layer 1
Datum
Layer 2
50 ft gap represents confining bed
Layer 3 variable bottom
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from GWV
Layer 1 type 1 Layer 2, 3 type 3
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Leakance between layers where each Layer belongs
to a different hydrogeologic unit
Layer 1 leakance
See AW, p. 81
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Leakance Quasi 3D model
Layer 2 leakance
See AW, p. 81
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from GWV
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Conceptual Model of the flow system
Recharge
Recharge
Playa
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QET RETM ?x?y h - (hs-d) / d
ET
for h ? hs-d and h lt hs
RETM is the maximum ET rate, which occurs when h
hs.
d
extinction depth
h
hs
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QET QETM at the land surface.
QET 0 below the extinction depth.
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Calibration Targets
associated error
calibration value
???0.80 m
20.24 m
Target with smaller associated error.
Target with relatively large associated error.