25 Pa. Code § 89.55 - Collection channels
(a) A
channel or ditch that is used to collect or transport waters, or both, into
wastewater treatment facilities shall be constructed to safely pass the peak
runoff from a precipitation event with a 10-year recurrence interval, or a
larger event as specified by the Department.
(b) Channel design shall incorporate:
(1) Channel linings to safely pass the design
velocities.
(2) Adequate
freeboard.
(3) Energy dissipators
when necessary.
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