DONJOVI, FROM WHAT YOU DESCRIBED IT SOUNDS LIKEEEXACTLY WHAT I DID FOR MINE. I HAVE AN 8 INCH OUTLET IN THE SPRING OR ONCE IN AWHILE WHEN IT RAINS VERY HEAVY. I JUST DID IT THIS SUMMER SO I CANT SAY HOW WELL IT WORKS. I WAS SHORT ON THE FENCING ABOUT 2FT ON EACH SIDE. THINKING I SHOULD ADD SOME FENCE BEFORE WINTER. HEREIS A LINK TO A POST THAT SHOWS A PICTURE WHICH IS WHERE I GOT THE IDEA FROM . WEEMS LIKE THE BEST SOLUTION AS IT SHOULD NOT CLOG UP.
http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=3;t=000126;p=1#000005