STEP 10. Determine the travel time for each flow path and select the longest time as a basin TOC. Use Table 2-
2, page 2-8 to calculate flow time in sheet conditions. Use Figure 2-2 to calculate the travel time in a ditch
condition. Use the following formula to obtain the flow time in a ditch:
Figure 2-2. Sheet flow travel time graph
2-7
EN5465
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