Ok, the name of this map has nearly nothing to do with it apart from it looks like it could be a big drainage thingy and there are sewage rivers at the sides.
This is my first sourceforts map, but please don't expect it to be total crap, I have made maps for source games before, and it has a 3D skybox, cubemaps, and was made with hammer configured for sf. The map is 100% symetrical for balance.
It could be useful for anything from uberforts to standard forts (could be a little hard to make a fort quickly enough if you create walls around spawns?)
Some ideas for the future are buttons between the build walls that toggle who has that section, something to block vision across the whole map in combat round (if there's no fort), cars going around the bridges, and a terrain in the 3D skybox.
Anyway, time for some picks f'clicks:
Overview/middle:

Flag section:

Spawn area:

Linky:
http://files.filefront.com/sf+waterw.../fileinfo.html