Water Distribution Model » Donohue & Associates, Inc. Client: City of O’Fallon Location: O’Fallon, Missouri The City of O’Fallon retained Donohue to update its model of the water distribution system. The purpose of the study was to integrate the model with the City’s GIS, input several new water main extensions, quantify the benefit of new water main reinforcements, and determine locations for new finished water storage. A total of 4,560 new pipe segments were brought into the model, including the additional water mains and related components of all new subdivisions and developments brought into the City since 2001. Donohue calibrated the model by taking static pressure and C-value measurements within in several key locations. Donohue also used the model to evaluate several options for fur

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