PERMFILE55704

• Permit No: C1981038
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: Volume 6A Phase III Stability Analysis - New Waste Area
• Media Type: D
• Archive: No

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then computed by dividing the total overland flow length by the average
velocity.
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Figure 3-1.--Average velocities for estimating travel time for
overland flow.
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Storm sewer or road gutter flow
Travel time through the storm sewer or road gutter system to the main
open channel is the sum of travel times in each individual component of
the system between the uppermost inlet and the outlet. In most cases
average velocities can be used without a significant loss of accuracy.
During ma,for storm events, the sewer system may be fully taxed and ad-
ditional overland flow may occur, generally at a significantly lower
velocity than the flow in the storm sewers. Hy using average conduit
sizes and an average slope (excluding aqy vertical drops in the system),
the average velocity can be estimated using Manning's formula.
Since the hydraulic radius of a pipe flowing half full is the same as
xhen flowing full, the respective velocities are equal. Travel time may