From publisher blurb:
City Sewers 1
is a printable dungeon floorplan compatible with any RPG/Dungeon-Crawl game. It can be used as a standalone gameboard, or combined with any same-scale tileset.
Consisting of 11 rooms, flooded corridors and water-filled chambers, this versatile floorplan has many uses, such as a dank sewer, a flooded dungeon, a monsters lair or wherever your adventures take you.
City Sewers 1 forms a 10 x 20 square area, and can be printed at 28mm and 25mm scale.