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.