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

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

Example 1:<br />

= 30 inches<br />

1<br />

Head-dependent Combinations<br />

of Transpiration Components<br />

Case 1: Transpiration =<br />

Uptake from saturated root zone<br />

Case 2: Transpiration =<br />

Uptake from saturated root zone plus<br />

Capillary uptake from unsat. root zone<br />

Case 3: Transpiration =<br />

Uptake from saturated root zone plus<br />

Capillary uptake from unsat. root zone<br />

plus uptake from irrigation <strong>and</strong><br />

precipitation<br />

Case 4: Transpiration =<br />

Capillary uptake from unsat. root zone<br />

plus Uptake from irrigation <strong>and</strong><br />

precipitation<br />

Case 5: Transpiration =<br />

Uptake from irrigation <strong>and</strong><br />

precipitation<br />

T<br />

c-pot Potential Transpiration<br />

Tgw-sat Transpiration fed by groundwater<br />

uptake in saturated root zone<br />

Tgw-unsat Transpiration fed by capillary<br />

groundwater uptake in unsaturated<br />

root zone<br />

Ti Transpiration fed by irrigation<br />

Tp Transpiration fed by precipitation<br />

Ec-pot Potential Evaporation<br />

Egw-sat Surface Evaporation from<br />

ponding groundwater<br />

Egw-unsat Surface Evaporation fed by<br />

capillary rise from groundwater<br />

Ei Evaporation fed by irrigation<br />

Ep Evaporation fed by precipitation<br />

1<br />

EXPLANATION<br />

Positive pressure head with<br />

maximum transpiration<br />

2 Positive pressure head with<br />

zero transpiration<br />

Transpiration from fully active<br />

portion of the saturated<br />

rootzone (ASRZ1)<br />

Transpiration from partially<br />

active portion of the<br />

saturated rootzone (ASRZ2)<br />

Total Transpiration from the<br />

saturated root zone<br />

Ground<br />

Surface<br />

Root<br />

zone<br />

Capillary<br />

Fringe<br />

water<br />

level<br />

Tgw<br />

-Extinction<br />

1<br />

1<br />

water level<br />

2<br />

2<br />

water level<br />

Components of Transpiration <strong>and</strong><br />

Evaporation with varying Water Level<br />

T gw-unsat<br />

T c-pot<br />

E<br />

c-pot<br />

Capillary<br />

Fringe<br />

E -Extinction<br />

gw<br />

water<br />

level<br />

c-pot<br />

Tc-pot Tc-pot<br />

Flux<br />

Example 2:<br />

Root zone = 30 inches<br />

1<br />

2<br />

T gw-sat<br />

= 30 inches<br />

= 10 inches<br />

E gw<br />

T i T p E i<br />

Subcomponents of Transpiration<br />

from Saturated Conditions<br />

Root<br />

Zone<br />

E p<br />

Ground<br />

Surface<br />

1<br />

1<br />

1<br />

1<br />

2<br />

2<br />

2<br />

2<br />

water level<br />

water level<br />

Subcomponents of Transpiration<br />

from Saturated Conditions<br />

T<br />

Example 1:<br />

Root zone = 30 inches<br />

1<br />

2<br />

= 20 inches<br />

= 10 inches<br />

Flux<br />

Example 3:<br />

Root zone = 30 inches<br />

1<br />

2<br />

= 40 inches<br />

= 10 inches<br />

Flux<br />

Subcomponents of Transpiration<br />

from Saturated Conditions<br />

Figure 1-2. Conceptualization to the change of transpiration uptake from a saturated root zone with varying water level (Three<br />

examples with different 1 values; example 1 at top includes conceptualization of all transpiration <strong>and</strong> evaporation components with<br />

varying water level).<br />

Root<br />

Zone<br />

Root<br />

Zone

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