It will be very difficult to get aid into Vancouver from the outside. The Sea Island airport will likely be destroyed and brides connecting to the East may be out all the way up the Fraser Valley. Others may not be much better. Most likely, the best way to get aid to a devastated Vancouver will be by ship from, say, Comox (if it isn't destroyed as well) It will be a serious pickle, no matter how you look at it.
Langley Airport and Chilliwack Airstrip.
Aldergrove crossing for aid.. but yeah, there would be mass devastation and casualties.