New Water Supply » Donohue & Associates, Inc. Client: South Sangamon Water Commission Location: Chatham and New Berlin, Illinois Donohue designed a new water supply system for the South Sangamon Water Commission in Central Illinois. The system includes a new well field, new treatment facilities, and a raw water main system between the two. The facilities are designed to provide 1.9 mgd of water on an average day, with a firm capacity of 3.3 mgd. Alternatives considered during the evaluation phase included microfiltration, diatomaceous earth filtration, pre-packaged proprietary treatment units, and conventional filtration with coagulation, flocculation, and sedimentation. The evaluation revealed that the most cost-effective solution was micro- filtration. The treatment train also includes i

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