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I .1. . I I I I I I I I I I I I I I I I I I STUDY PURPOSE AND OBJECTIVES The purpose of the reconnaissance-level study was to conduct a preliminary evaluation of the flood problems on Rock River and two of its tributaries at Rock Rapids. This study determines whether or not there is at least one flood damage reduction alternative that warrants a Federal interest in conducting feasibility level studies and, if so, to determine the scope and cost of these studies. In addition, determination of non- Federal sponsor support for cost-sharing of these studies would be solicited. The reconnaissance study objectives follow. o Define the flood problems and identify the needs of the city of Rock Rapids; o Identify at least one feasible solution for the Corps' implementation under current policy; o Determine whether or not the study should proceed to the feasibility phase. This includes identifying the Federal and non-Federal interest through assessing the level of support and willingness of a local sponsor to share the cost of the feasibility phase; and, o Produce a study cost-sharing agreement with the sponsor to share feasibility-phase costs, including a scope of study and the study cost estimate. For purposes of this reconnaissance study, the Corps determined that the alternative that would show the greatest potential for warranting a Federal interest in proceeding to follow-on feasibility phase studies would be a levee alternative. Based on this determination, prior to initiating this study, the Corps decided that at least five separable levee "units' would be analyzed along the Rock River in Rock Rapids for flood damage reduction purposes, including. II From near South Fifth Avenue to near South Seventh Avenue west of the fairgrounds; 2l from 3