Elements of the Water Budget

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Elements of the Water Budget
P
All the PRECIPITATION that falls in one month
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Elements of the Water Budget
P
All the PRECIPITATION that falls in one month
EP
Potential Evapotranspiration
The ENERGY available to evaporate water
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Elements of the Water Budget
P
All the PRECIPITATION that falls in one month
EP
The ENERGY available to evaporate water
P- EP
If P-EP gt 0, then....
If P-EP lt 0, then....
Theres energy that can still evaporate more water
Theres water left over
When water is left over after evaporation, it can
do either of 2 things.....
Left over energy can look for more
water.....(where?)
Soak into the ground (infiltrate) Run off in
streams
In the soil! (called Storage)
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Elements of the Water Budget
P
All the PRECIPITATION that falls in one month
EP
The ENERGY available to evaporate water
P- EP
If P-EP gt 0, then....
If P-EP lt 0, then....
Theres energy that can still evaporate more water
Theres water left over
When water is left over after evaporation, it can
do either of 2 things.....
Left over energy can look for more
water.....(where?)
Soak into the ground (infiltrate) Run off in
streams
In the soil! (called Storage)
St
Water stored in the Soil (soil moisture)
When DSt is ()...
When DSt is (-)...
St lt maximum, and PgtEP
St gt0 and PltEP
called Recharge
called Usage
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Elements of the Water Budget
P
All the PRECIPITATION that falls in one month
EP
The ENERGY available to evaporate water
P- EP
If P-EP gt 0, then....
If P-EP lt 0, then....
Theres energy that can still evaporate more water
Theres water left over
When water is left over after evaporation, it can
do either of 2 things.....
Left over energy can look for more
water.....(where?)
Soak into the ground (infiltrate) Run off in
streams
In the soil! (called Storage)
St
Water stored in the Soil (soil moisture)
When DSt is ()...
When DSt is (-)...
St lt maximum, and PgtEP
St gt0 and PltEP
called Recharge
called Usage
EA
Actual amount of water evaporated.
EA gt EP when
P St gt EP
NEVER!
EA EP when
EA lt EP when
P St lt EP
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Elements of the Water Budget
P
All the PRECIPITATION that falls in one month
EP
The ENERGY available to evaporate water
P- EP
If P-EP gt 0, then....
If P-EP lt 0, then....
Theres energy that can still evaporate more water
Theres water left over
When water is left over after evaporation, it can
do either of 2 things.....
Left over energy can look for more
water.....(where?)
Soak into the ground (infiltrate) Run off in
streams
In the soil! (called Storage)
St
Water stored in the Soil (soil moisture)
When DSt is ()...
When DSt is (-)...
St lt maximum, and PgtEP
St gt0 and PltEP
called Recharge
called Usage
EA
NEVER!
Actual amount of water evaporated.
EA gt EP when
P St gt EP
EA EP when
EA lt EP when
P St lt EP
When theres energy that never finds water, we
say we have a .... DEFICIT
When theres more water than energy at the end of
the month, we say we have a SURPLUS
S
D
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Elements of the Water Budget
P
All the PRECIPITATION that falls in one month
EP
The ENERGY available to evaporate water
P- EP
If P-EP gt 0, then....
If P-EP lt 0, then....
Theres water left over
Theres energy that can still evaporate more water
When water is left over after evaporation, it can
do either of 2 things.....
Left over energy can look for more
water.....(where?)
Soak into the ground (infiltrate) Run off in
streams
In the soil! (called Storage)
St
Water stored in the Soil (soil moisture)
When DSt is ()...
When DSt is (-)...
St lt maximum, and PgtEP
St gt0 and PltEP
called Recharge
called Usage
EA
Actual amount of water evaporated.
EA gt EP when
P St gt EP
NEVER!
EA EP when
EA lt EP when
P St lt EP
When theres energy that never finds water, we
say we have a .... DEFICIT
When theres more water than energy at the end of
the month, we say we have a SURPLUS
S
D
8
INFILTRATION
Infiltration refers to water soaking into the
ground
Infiltration rate
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EP
P
Rainy season, when theres extra water
When theres plenty of energy but not enough
water to satisfy the energy...
RESERVOIRS
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The Water (Hydrologic) Cycle
-all the ways that water vapor enters the air
Condensation
Animal Respiration
Transpiration
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