The report indicates many of these underpasses need to be 6 or 8 times larger. Yet CaryвЂ™s TCAP storm water system, mostly built in the 1950вЂ™s and 60вЂ™s, has still not been upgraded to handle decades of new development in and around downtown.ДЄ major cause of flooding identified in the report, are undersized culverts that run beneath road crossings. Numerous areas show the potential for roadway, property, and structure flooding, as well as other problems such as erosive velocities as a result of the undersized system.вЂќ вЂњThe results from the existing and future conditions analyses reveal that significant portions of the existing drainage system in the TCAP area do not meet the desired level of service or current design standards. The 2006 study identified grossly undersized storm water systems which did not meet Town guidelines. It includes Swift Creek, Coles Branch and Walnut Creek.

The study was for вЂњdowntownвЂќ, or more broadly what Cary calls its вЂњTown CenterвЂќ area, or TCAP. In 2006, in anticipation of major downtown development, the Town of Cary commissioned the Dewberry and Davis engineering company to evaluate 2006 flooding problems, future flood risks, and recommend any improvements needed to minimize flooding and to handle future development. The attached report is the starting point for anyone trying to understand how and why so many homes and cars are now being flooded in and around downtown Cary. A 2006 engineering study identified major problems in CaryвЂ™s downtown storm water system.

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