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17 Cards in this Set
- Front
- Back
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regime
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=timing of that water yield over many years, a single year, or for events of shorter durations
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water quality
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=chemical or biological attributes of water in relation to a particular use or a regulatory standard
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diagram of water balance equation
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water yield
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=the total quantity of water produced over a given period (annual). The total runoff or streamflow from a watershed
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how do you manage yield in forests?
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-balance harvest against recovery of old disturbances
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hydrolic cycle
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-precipitation to evaporation
-98% evaps from ocean -in a forest, no surface runoff, all goes into soil |
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water balance equation
(arithmetic expression of the hydrolic cycle) |
P= S + (T + I + E) + Q
P= precipitation (input) S= change in storage Q= runoff or streamflow (loss) E= evaporation (loss) T= transpiration (loss) I= interception (loss) |
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how to manage H2O
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a. water yield
b. water regime c. water quality |
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forest and water
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-water is the basis for life, has no substitutes, and is finite but recyclable
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transpiration
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=water lost through leaf stomata during photosynthesis
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what does transpiration depend on?
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-how much leaf area in forest
-what tree species are present b/c some use more H2O |
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what does interception of precipitation depend on
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-how much leaf area in forest
-what tree species present -type and amount of precipitation |
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interception of precipitation
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=capture of precipitation on foliage and subsequent re-evaporation back to the atmosphere
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how does one store water
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use of dams
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water regime
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=the distribution of yield over time. The pattern of annual flow or flow resulting from an individual stormq
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where does water flow
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88% north
12% east |
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how long do increases in yield last?
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-a function of how fast vegetation grows back.
recovery is fast/slow when tree growth is fast/slow |
