Two of Frisco's elevated water tanks would get equipment designed to keep their water from losing its disinfectant, under a contract on the City Council's consent agenda Tuesday.
The council will vote on a $445,634 professional services agreement with Freese and Nichols to design what the city calls chloramine residual control systems for the 2.0-million-gallon Parkwood elevated storage tank and the 2.5-million-gallon Stonebrook tank.
Chloramine is the disinfectant in the water, and the systems are meant to keep its level from dropping while water sits in the tanks and moves through the distribution system.
According to a memo from the Administrative Services Department, the systems would use mixing equipment to keep water inside the tanks from separating into warmer and cooler layers, a problem known as thermal stratification. Keeping the tank water uniform helps prevent disinfectant levels from falling.
The city says the work should also reduce how often crews have to flush water mains by opening fire hydrants, which would trim water loss and maintenance time.
