Gabe Brown's work is primarily on improving soil health, not on earthworks for flood prevention, aquifer recharge, etc. His gains in rainwater infiltration is a secondary effect of the steps he's taken to improve his soil.

In terms of projects whose primary aim is flood prevention / aquifer recharge, John D. Liu, Andrew Millison, and Geoff Lawton all have documented quite a few projects that have been very successful in addressing the problem.