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Covered circular tank

12.5 million gallons storage

Under construction

Nashhill Reservoir

Montgomery Watson and Massachusetts Water Resources Authority
Boston, Massachusetts

In this new 12.5 million-gallon circular covered storage tank, the inlet and outlet are located on diametrically opposite sides of the tank.  While there were no specific T10 requirements, the Massachusetts Water Authority desired a tank with relatively small recirculation zones and good flow characteristics. 

Several alternate configurations were evaluated.  The chosen configuration, which involved the use of a vertical inlet and a 4 percent porous baffle placed a short distance downstream of the inlet, provided a compromise between cost, ease of construction, and water quality.

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