City of Louisville, Colo., had just one potable storage tank. To increase storage capacity to 8 million gallons, the Public Works department built a 3 million gallon tendon-prestressed concrete tank and converted the old tank into a chlorine contact basin that feeds the new tank. Even so, Colorado's weather took its toll on the half-century-old original tank. DRP Consulting Inc., a Boulder Colo., firm that specializes in concrete petography recommended modification rather than complete replacement of the tank.

To give incoming water sufficient chlorine contact time, the team recommended building a series of floor-to-ceiling concrete baffle walls within the tank. In addition to allowing water to flow from one end of the tank to the other, the 8-inch-thick walls could be used to extend the structure’s life by supporting the deteriorating roof.

Read More