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I I I I I I I I I I I I I I I I I I I I alternatives, The alternatives that the City was interested in having further analyses performed are as follows: . Channel maintenance and new levees along Main Ditch upstream of 9th Street NE to the City limit . Channel modification along Main Ditch between Ninth Street NE and Hiawatha Ave, . A new diversion channel near Hiawatha Ave. that would carry a portion of the flood flows from the Main Ditch, . Acquisition and relocation of commercial and residential structures within the 100-year floodplain in Pipestone. 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 Greenhorne & O'Mara, Inc. for the Omaha District in order to address flooding problems along Main Ditch at Pipestone, Minnesota. The federally funded reconnaissance-level study was initiated in response to a letter dated July 6, 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 Main Ditch and County Ditch A in the vicinity of Pipestone, A Problem Identification Report (Greenhorne & O'Mara, Inc" April, 1995) was published as part of that study which evaluated existing flood problems at Pipestone, 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. After careful review, the Omaha District determined that there were not enough expected annual flood damages within the City to warrant proceeding with the original reconnaissance study. 2