The Sutherland Valley is a broad, geologically-controlled floodplain. This study attempts to quantify the depth and extent of flooding so that floodplain permits can be issued for development which meets local and federal restrictions.

Describes the evolution of transportation routes and transportation methods in Pima County throughout time, and the effect that modes of transportation have had on the size and form of the community. Stage, freight, and railroad transportation followed the main historic corridors established by previous cultures and technologies.