In order to keep pace with extraordinary growth, the City of McKinney developed a long-term plan to receive water from a new transmission main from the North Texas Municipal Water District and to provide water for two separate pressure planes. The City contracted with LAN to design the transmission main to supply water to the eastern part of their system. The transmission main design included 4,790 LF of 54-inch and 480 LF of 36-inch steel pipe, including butterfly valves, combination air valves, pipeline blow-offs and all other appurtenances.

The design included one 36-inch and three 12-inch system interconnections to integrate the new transmission main into the transmission system. One major challenge of this project included a compressed design schedule of three months and a compressed milestone construction schedule for construction of a section through a public development of which the City was a partner. LAN was able to successfully meet the expedited design schedule and structured the construction documents to meet the City’s constraints. Another major challenge was designing the main around an existing 72-inch waterline and another 84-inch steel waterline under construction that were perpendicular to each other. Since the pipelines were at different elevations, the proposed City of McKinney pipeline had to be designed for placement over one and under the other, considering available construction space.

The project was successfully delivered ahead of the City’s original schedule to support the nearby development, with the low bid accepted approximately 7% below the City’s budget.