If you are seriously considering changing your career focus from design to management, understand the skills you will need and the change in focus that may be required. Essentially, you will use the skills you have developed in the last 10 years to help make decisions in a new capacity...
It sounds like you are interested in researching Traditional Neighborhood Development principles, also referred to as New Urbanism. A couple of resources you may want to start with are:
www.cnu.org
http://www.goprincegeorgescounty.com/government/agencyindex/der/ppd/lid.asp...
Prince Georges County in Maryland has done much work to develop standards for bioretention as a method to lessen the impact of development. It is a constructed area to provide infiltration and oil/grit separation adjacent to areas of sheet flow (like a parking lot) which will receive the runoff...