1. Types of structure concerned

Water tanks

• Water towers ;

• water tank for human consumption ;

• water tank for various uses ;

• fire-fighting reserves.

Water towers consist of one or more tanks raised above the ground and supported by towers, walls, posts or pillars. Some structures may include combinations of these two main features.

Reservoirs are made up of one or more tanks, the bottom of which is at or below ground level and rests on the ground either directly or via any type of foundation.

Wastewater treatment plants

Structures containing water that may be loaded with dissolved or suspended matter (the...