§ 5.3.2. Maximum Velocities

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Maximum velocities in conduits are important because of the possibility of excessive erosion of the storm drain pipe material. Table 5-1 lists the maximum velocities allowed at the peak rate flow during the 25-year event.

Table 5-1 Maximum Velocity In Storm Drains
Type	Maximum Permissable Velocity
Storm Drains (inlet laterals)	No limit
Storm Drains (trunk)	20 fps

                    
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