Watch these four videos (total time about 52 minutes) which tour several permaculture sites and showcase the potential for water management.
Permaculture Keyline Water Systems: Tom Ward @ Wolf Gulch Farm
Watershed 2.0 (Re-thinking and Retrofitting for Resilience): Brock Dolman
John Todd: Green Eco-Machine
https://vimeo.com/6345651 (~11 minutes)
Dr. John Todd oceanarksint.org/ developed the Eco-Machine, which restores polluted water through a natural process. The design has been implemented by the JTED toddecological.com/ company in multiple areas including China and the U.S.