APRIL 2017 – In an already booming population growth, utility infrastructure in Nashville and Davidson County, Tennessee, is on the rise. In an effort to stay ahead of this growth, Metro Water Services (Metro) uses a water distribution system model to establish a Water Master Growth Plan for future improvements needed within the system.
Projecting growth models is paramount in serving Metro’s 187,000 customers. Metro’s water system is comprised of two water treatment plants with a combined capacity of 180 million gallons per day (MGD) and a distribution system containing more than 3,000 miles of waterlines.
The Cumberland City Low Transmission Water Main was developed to eliminate possible future water pressure and flow problems. The $32.9 million project is the largest monetary water main project Metro has undertaken in more than 30 years.
Garney crews are working 24 hours per day to install 27,000 LF of 10″ to 60″ ductile iron water main through major intersections in Nashville. This water main will provide the first phase of the replacement waterline to the K. R. Harrington Water Treatment Plant and will provide a redundant water main to the east side of the Stones River. Construction also includes 460 LF of 48″ and 60″ RCP stormwater pipe, 290 LF of 36″ ball and socket ductile iron pipe, dewatering for the Stones River crossing, 120 LF of 96″ horizontal directional drill liner plate tunnel under a railroad track, a tie-in to an existing 60″ PCCP water main, rock excavation, and several water service connections.
Multiple routing alternatives were evaluated and compared, with consideration given to numerous criteria including environmental, legal, water quality, permitting, property acquisition, constructability, cost, schedule, and overall impact to Metro’s customers. The selected route provided the best flow conditions and shortened the water age in the distribution system.
“Garney has further worked with Metro and design engineer, Gresham, Smith and Partners, to tremendously minimize traffic disruption on Lebanon Road and Donelson Pike,” said Cyrus Toosi, Assistant Director of Engineering at Metro Water Services. “Garney is also playing a large role in an extensive public outreach program, interfacing with residents and businesses to minimize disruption.”