Listers,

This may seem like a random question, but potentially I am building a hangar on a lot that has a water drainage issue with taxiway runoff.  The building needs to be elevated, not a big deal, but that slopes the apron leading to the taxiway.  Does anyone know if there’s a code value for the slope, i.e. a 1% grade, or some other rule of thumb as to what may constitute too steep of a grade, i.e., so steep that pushing the plane up would be too much or so steep the plane would roll uncontrollable down if one is moving it by hand?  Any insights would be appreciated.

Michael Smith