One roof design that provides particularly great drainage is a saltbox-style roof. These roofs are easily identifiable by their asymmetry -- one side is much shorter than the other, steeper side.

The Crabill House by Tonic Design is a simple, affordable and modern home in a forest in Hillsborough, NC. The Crabill House by Tonic Design is a ... as a trapezoidal volume with a shed roof.