The need for and use of water tanks has been around for as longas civilization has. Water tanks can be used for a huge number ofthings such as storing water for outdoor use or drinking by humansor livestock, agricultural irrigation systems, fire suppressionsystems (think fire hydrants), or in specially created watertreatment systems. The latter category of tanks are created withspecial materials and allow for the holding of water that is beingtreated with chemicals so that it becomes safely usable by thepublic once again. The Municipal Water Treatment Plant of Houston,TX uses several of these types of tanks.Many different materials can be used to construct water tanks.Historically wood or ceramic was a popular choice, but tanks todayare made out of things such as polyethylene or polypropyl