Patent ID: 8123935

Claim:
A water runoff system for removing suspended particles from a liquid, the system comprising: a filter chamber defining an internal chamber; a deck positioned within said internal chamber and dividing said filter chamber into an upper chamber and a lower chamber, the deck having a plurality of holes formed therein, each hole having a filtration element therein; an inlet line for introducing a liquid into said lower chamber; an outlet above said deck for permitting liquid to exit said upper chamber; and a ridge positioned on a top surface of the deck, wherein said ridge forms a continuous perimeter on the top surface of the deck and has at least one filtration element positioned within said perimeter; wherein, when flow subsides from said inlet, liquid that has accumulated above said deck and inside of said perimeter, then flows backwards through any filtration elements located inside of said perimeter, flowing downward, and into said lower chamber and up through an opening in said deck which is external of said perimeter, thereby backwashing filter elements located inside the perimeter with filtered liquid.