Concept explainers
On an annual basis, the precipitation in a watershed is 1,778 mm, the actual evapotranspiration is 914 mm, and 61 percent of the surplus precipitation is runoff. what is the percentage contribution of each component of the watershed budget?
The percent contribution of actual evaporation, groundwater discharge andsurface runoffcomponent of the watershed budget.
Answer to Problem 3PEB
Solution:
Explanation of Solution
Given data:
The precipitation in a water is
The actual evapotranspiration is
Formula used:
Write the watershed budget that can be expressed as precipitation equals actual evaporation plus groundwater discharge plus surface runoff:
Here,
Explanation:
Rearrange the watershed budget equation to derive an equation for each component in terms of the other components, and then write an equation that expression
Therefore, rearrange in terms of
Now, rearrange in terms of
And,
Substitute
Substitute
Substitute
The percentage is the ratio of each component to
Calculate the percentage of each component of the watershed budget.
For actual evaporation,
Substitute
For surface runoff,
Substitute
For groundwater discharge,
Substitute
Conclusion:
The percent contribution of actual evaporation, groundwater discharge andsurface runoff component of the watershed budget are
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