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I I I I , I I I I I II I I I I I I I I I . Evaluation of a new levee located to the west of the fairgrounds that would provide at least a tOO-year level of protection for structures between South 8th Avenue and South 4th Avenue. . Evaluation of the level of protection and reliability provided by the newly constructed levee located on the north side of the city near North 4th A venue and Boone Street. . Identification of a conceptual closure structure for the above levee where it crosses Boone Street. . Evaluation of the level of protection and reliability provided by the private ring levee located along the Rock River near East Street. SCOPE OF STUDY The study is of conceptual-level detail and is based on information from meetings between the City and the Omaha District, existing data sources, general site inspections, cursory analyses, and engineering judgment. This study was conducted in sufficient detail to evaluate the preliminary construction quantities and costs for the proposed improvements. PREVIOUS SECTION 205 STUDY A Section 205 Reconnaissance Study was conducted by Greenhome & O'Mara, Inc. for the Omaha District in order to address flooding problems along the Rock River at Rock Rapids, Iowa. The federally funded reconnaissance-level study was initiated in response to a letter dated August 9, 1993 from the City to the Omaha District. The Omaha District requested and received funds to initiate a reconnaissance study of flood problems on the Rock River and its tributaries in the vicinity of Rock Rapids. A Problem Identification Report (Greenhome & aMara, Inc., April, 1995) was published as part of that study which evaluated existing flood probIems at Rock Rapids. The published information was used by the Omaha District to determine whether or not there would be a Federal interest in conducting further (feasibility-level) studies at this location 2