Systems in this section were created 1969 to 1990. They are a mix of real and artificial systems created to test various methods of analysis for design optimization. A few of these systems have been modified throughout the years and appear in their original and modified versions.
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01 New York Tunnel
The New York Tunnel system is based on the real-world transmission system in New York City and was created by Schaake & Lai in 1969 as part of a study to optimize the duplication of the existing system to meet demand increases. The system has a total demand of 1305 MGD, one reservoir and 21 tunnels with a total length of 69.2 miles. It is classified as distribution dense-grid by Hwang & Lansey (2017) and gridded by Hoagland et al. (2015).
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02 Nineteen Pipe
The Nineteen Pipe system was created by Wood et al. in 1972 for use in computer modelling. The system has two reservoirs and 5.2 miles of pipe. It is classified as distribution dense-grid by Hwang & Lansey (2017) and gridded by Hoagland et al. (2015).
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03 Two-Loop System
The Two Loops system was created by Alperovits & Shamir in 1977 to optimize distribution system design using linear programming gradient method. The system has one reservoir and 8 km of pipe. It is classified as distribution dense-grid by Hwang & Lansey (2017) and gridded by Hoagland et al. (2015).
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04 Modified Nineteen Pipe
The Modified Nineteen Pipe system was created by Ormsbee & Contractor in 1981 and is based on the Nineteen Pipe System. The system has a total demand of 3.1 MGD, two reservoirs and 6.25 miles of pipe. It is classified as distribution dense-grid by Hwang & Lansey (2017) and gridded by Hoagland et al. (2015).
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05 Federally Owned Water Main
The Federally Owned Water Main system is a skeletonized version of the water distribution system servicing northern Arlington County, VA. It was originally used by Walski in 1985 to evaluate the resilience of the network. The system has a total demand of 3.2 MGD, one reservoir and 16.7 miles of pipe. It is classified as transmission branch by Hwang & Lansey (2017) and looped by Hoagland et al. (2015).
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06 Fourteen Pipe
The Fourteen Pipe system is a simple example system originally used by Gessler & Walski in 1985 to test pipe size optimization software. The system has a total demand of 12,100 CMD, two reservoirs and 30.6 km of pipe and is classified as distribution dense-grid by Hwang & Lansey (2017) and gridded by Hoagland et al. (2015).
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07 Hanoi System
The Hanoi system is a based on the planned trunk network of Hanoi, Vietnam and was originally used by Fujiwara & Khang in 1990 to test pipe size optimization software. The system has a total demand of 126.5 CMD, one reservoir and 39 km of pipe. It is classified as transmission dense-loop by Hwang & Lansey (2017) and looped by Hoagland et al. (2015).
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08 Modified Federally Owned Water Main
The Modified Federally Owned Water Main system is based on the Federally Owned Water Main system created by Walski in 1984. It was updated by Ormsbee & Kessler in 1990 to study reliability and upgrade optimization. The system has a total demand of 3.2 MGD, one reservoir and 9.5 miles of pipe. It is classified as transmission dense-loop by Hwang & Lansey (2017) and looped by Hoagland et al. (2015).