Development and Application of a Dual Drainage Model for the Wethersfield Area of the City of Hartford, Connecticut

by Michael E. Hulley,
C. Neil Geldof,
William W. S. Gray,
A. Charles Rowney,

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water


A combined system, with overflows, existed in the City of Hartford, Connecticut. Although effective in the context of design standards prevailing at the time of its original design, the system required improvement to meet developing EPA regulations. A comprehensive model was developed representative of the major and minor flow systems. Dual drainage as an extension of cl? SWMM modeling approaches is explored in the context of a study of this system. Basic model setup and calibration were found to be greatly facilitated by direct representation of dual drainage elements. Substantial cost savings are achieved without adverse impact on service levels by balancing gutter and pipe flow elements. In this case study that cost savings and operational efficiency are both improved by shifting the emphasis of servicing to an integrated and centralized system which reduced the need for numerous local scale facilities by redefining sanitary, storm, and combined system elements.

Subject Headings: Drainage systems | Urban areas | Drainage | Case studies | Water resources | Benefit cost ratios | Storms | Connecticut | United States

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