Let's see those '10 gardens

[rack04]

Next year I plan on installing a couple 12'x3' raised planter beds. Should I add a course of gravel to the bottom of the raised planter to increase drainage or just fill it to the brim with good compost?

I will likely be growing tomatoes, squash, asparagus, cucumbers, peppers, mint, sage, oregano, cilantro, basil, dill, rosemary, and parsley.