Runoff Retention

Hi, 
Does anyone have any experience with rainwater runoff
retention systems?  I'm looking for contractors (in
greater Los Angeles) with experience installing rain
percolation traps or other underground retention
devices.  I'm also interested in more low-tech ways of
keeping  rain water on site, such as incising solid
concrete, dry wells, placement of trees and shrubs
along swales, etc.
Thanks!
-Ben Wiswall
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