What runway has the steepest climb-out requirement upon take off?
This would probably be due to the need to avoid some natural obstacle, such as a mountain.
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The first one that came to mind is London City Airport (EGLC) which is world famous for its steep approaches, and for which I found these requirements on its departure charts:
OBSTACLE CLEARANCE -
RWY 09: Maintain minimum 6.76% climb gradient to 275 (258).
RWY 27: Maintain minimum 7.20% climb gradient to 1102 (1085).
(Where the first number is altitude in feet and the second number is AAL, above aerodrome level)
