ED Decision 2014/013/R
(a) The safety objective of taxiway transverse slopes is to promote the most rapid drainage of water from the taxiway.
(b) The transverse slopes of a taxiway should be sufficient to prevent the accumulation of water on the surface of the taxiway but should not exceed:
(1) 1.5 % where the code letter is C, D, E, or F; and
(2) 2 % where the code letter is A or B.
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