A comprehensive discussion that examines land-use planning in the context of slope factors is available from the United States Geological Survey (USGS) - specifically referring to Los Altos Hills.
This was written by acknowledged experts - professionals whose job it is to study these things and understand them. One of the authors (Art Lachenbruch) is a former planning commissioner in Los Altos Hills and a long-time resident of our town.
The work consists of a main document (dated October 2002) together with some maps and diagrams that are referenced within the document and that are contained on separate files. The links to the separate files are provided below: