How Do I Get Past The Sewer?
 

Am at the part when your in the small hole, and a zombie is blocking the entrance.

...

The passage has two entrances. Best of luck!

Sneaky sneaky sneaky. Gotta be smarter then those damn Walkers

Take off the valve, and go to the little door behind you (you can't see it but you passed it before) and open it. Don't go near the zombie... he'll get you.

Once open go to the pipe without valve, put the valve in and turn it to get the water running;

Trackback through little passageway and move up :)