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Central Valley Aquifer, Chapters A and B - MAE Class Websites

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218 Groundwater Availability of the <strong>Central</strong> <strong>Valley</strong> <strong>Aquifer</strong>, California<br />

Ground<br />

Surface<br />

Groundwater<br />

Level<br />

Bottom of<br />

Root Zone<br />

Wilting<br />

| |<br />

4 | |<br />

3 2<br />

1<br />

Depth below Surface<br />

= 1<br />

= 0<br />

Anoxia &<br />

High<br />

Pressure<br />

ln (| |), for < 0 Soil Water Pressure Head , for 0<br />

| | =<br />

| |(d)<br />

Stress Response<br />

= h - z<br />

Depth below Surface<br />

User specified stress response function,<br />

Simplified stress response function in FMP<br />

Pressure head distribution in unsaturated root<br />

zone: | | = | |(d) solved by analytical solution<br />

Hydrostatic pressure heads in saturated root<br />

zone: = h - z = head minus elevation<br />

Unsaturated Zone within Root Zone<br />

Saturated Zone within Root Zone<br />

Saturated Zone below Root Zone<br />

Zero uptake Full uptake<br />

0 Stress Response 1<br />

Wilting Zone with<br />

zero uptake (WZ)<br />

Active Unsaturated<br />

Root Zone with full<br />

uptake (AURZ)<br />

Active Saturated<br />

Root Zone with<br />

full uptake<br />

(ASRZ1)<br />

Active Saturated<br />

Root Zone with<br />

reduced<br />

uptake<br />

(ASRZ2)<br />

Inactive<br />

Saturated<br />

Zone below<br />

Root Zone<br />

with zero uptake<br />

Inactive Saturated<br />

Zone with zero<br />

uptake due to<br />

High Pressure (> 1)<br />

<strong>and</strong> Anoxia<br />

Figure 1-1. Evaluation of active <strong>and</strong> inactive parts of a variably saturated root zone in FMP (Concept of stress response, , as a<br />

function of pressure heads, , varying over depth, d).

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