Final Project From USGS Hydrologic Atlas online.
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Final Project From USGS Hydrologic Atlas online
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Transcript of Final Project From USGS Hydrologic Atlas online.
Final Project
From USGSHydrologic Atlas online
Playa
Recharge Recharge
Conceptual Modelof the flow system
Layer 3 – variable bottom
Layer 2
Layer 1
50 ft gap representsconfining bed
Layers
Datum
The problem of dry cells and re-saturation
from GWV
Layer 1 = type 1Layer 2, 3 = type 3
Leakance between layers where eachLayer belongs to a different hydrogeologic unit
See A&W, p. 81
Layer 1leakance
Leakance“Quasi 3D” model
See A&W, p. 81
Layer 2leakance
from GWV
Playa
Recharge Recharge
Conceptual Modelof the flow system
h
QET = RETM xy [h - (hs-d)] / dET
d
hs
extinction depth
RETM is the maximum ET rate,which occurs when h = hs.
for h hs-dand h < hs
QET = 0 below theextinction depth.
QET = QETM at the land surface.
Calibration Targets
calibration value
associated error
20.24 m
0.80 m
Target with relativelylarge associated error.
Target with smaller associated error.
