New City of Marysville Upground Reservoir

In 2007, H.R. Gray was retained as the construction manager for the Marysville (Ohio) Upground Reservoir Project. With a total budget of $24,000,000, the project originally consisted of four contracts providing a complete system to capture water from Mill Creek, pump it to the new reservoir, and ultimately deliver the water to the Marysville Water Plant. In order to meet the City’s desired completion date, an additional contract was issued for the design and procurement of an inflatable dam and associated controls. The inflatable dam system monitors upstream water levels and downstream water flow and adjusts the amount of water diverted to the reservoir in order to maintain environmentally-friendly flow conditions. In addition to the control center in the pump station that monitors stream flows and levels at the dam, the City of Marysville will also be able to monitor water levels in the reservoir via remote transmitters, maintain historical data, and report all of the data to the main water plant.

Contracts 1 and 2 provided the piping work necessary to transport water from Mill Creek to the new reservoir and then from the new reservoir to the existing water plant. The 117-acre reservoir constructed along Raymond Road will have a storage capacity of 1.3 billion gallons requiring the excavation of 1.7 million cubic yards of on-site soil to construct the 11,000 linear feet of 48-foot embankments.

The upground reservoir was constructed under Contract 3. Key to success of this project included a quality control and assurance program that included thorough inspection of concrete work, a complete punch list, and coordination of issues between the contractor, the City, and a third-party stakeholder, the County. This quality control provided assurance that the City received the project, and product, that they had paid for under the contract.

The fourth contract encompassed the construction of the dam, intake structure and pump station building in addition to the installation of an inflatable dam purchased under a separate contract with the dam manufacturer. Depending upon the flow rates and water levels in Mill Creek and other environmental conditions, the pump station will be capable of providing water to the reservoir at a rate of up to 40 million gallons per day.

The entire project was completed in February 2009

 

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