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How are buffers modeled?
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Although you could perform a separate hydrograph routing through the wooded buffer, the more common approach is to treat the woods as part of a subcatchment.
The woodland would typically have a low CN value, which would reduce the overall (weighted) CN value of the subcatchment, and thus reduce the runoff volume. (See the SCS runoff equation for details.)
The woods may also contribute to a longer time-of-concentration, which will delay the runoff and reduce the peak flow.
The woodland would typically have a low CN value, which would reduce the overall (weighted) CN value of the subcatchment, and thus reduce the runoff volume. (See the SCS runoff equation for details.)
The woods may also contribute to a longer time-of-concentration, which will delay the runoff and reduce the peak flow.
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