Southeast Basin Interceptor and Siphon Client: Richmond Sanitary District Location: Richmond, Indiana Richmond’s Southeast Sanitary Basin was experiencing surcharging and sanitary sewer overflows (SSOs) during wet weather events. To address these issues, Donohue & Associates completed a comprehensive plan that considered existing and future land usage, existing sewer conditions, and future anticipated sewer requirements. A SWMM model was built using flow monitoring and GIS data supplied by the District. Donohue prepared plans and specifications for the recommended improvements. This included 23,000 feet of 12- to 30-inch interceptor sewer parallel to the existing sewer system at depths up to 25 feet and nearly 2,000 feet of 18-inch siphon parallel to existing triple barrel siphon lines. T

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