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~ coPY. <br /> URS Greiner Woodward Clyde <br /> <br /> Mr. Steve Gallup <br /> City of Eugene <br /> March 12, 1999 <br /> Page 2 <br /> Description: URS staff have developed a hydraulic model of the Amazon Creek Basin based on <br /> 19941and use data for the basin planning project under a separate contract. This existing hydraulic <br /> model includes the Frederick Ct. drainage system from Frederick Ct. (node 51204) to the Amazon <br /> Creek outfall. URS staff will update the basin planning project hydrologic hydraulic model to <br /> represent more refined drainage patterns, more current (1998) land use conditions, and to include <br /> additional pipe segments and open waterways. Using the historic design storm method developed <br /> for the basin planning project, URS will identify flood control problems under existing and future <br /> land use conditions. Specific subtasks that will be completed include the following: <br /> + Refine and, if necessary, subdivide the subbasin boundaries and the hydrologic input data for <br /> subbasins AMUP-190 and AMUP-200 to represent existing and projected future development <br /> conditions. ' <br /> • Expand the hydraulic model for the Frederick Ct. drainage system based on information <br /> provided by the City. <br /> • Analyze the capacity of the system using the 10-year and 25-year recurrence interval historic <br /> design storms under existing and future land use conditions. <br /> • Present a summary of the flood control problem identification to the City. <br /> Task 2 -Capital Project Preliminary Design <br /> Objective: Complete preliminary design of storm drainage system improvements. <br /> Description: URS will prepare a preliminary design for each capital project based on the flood <br /> control problem(s) identified in Task 1. The capital projects will be evaluated and designed using <br /> the SWMM hydraulic model developed under Task 1. The preliminary design will be at the 30% <br /> design phase and will include a plan view, profile of pipe segment improvements, typical sections <br /> for open waterway improvements, and a preliminary cost estimate. <br /> CITY SERVICES REQUIRED <br /> The City will provide all available drainage studies completed for developments within the study <br /> area in order to facilitate revisions and refinements to the existing subbasin boundaries. City <br /> survey crews will provide typical cross-sections at 50' to 100 `intervals for the following four <br /> open waterways: <br /> 1. Open waterway between Monroe St. to Deertrail Rd.: node 50195 to node 50111 <br /> 2. Open waterway from Deertrail Rd. to W. 38~' : node 66911 to node 50138 <br /> 3. Open waterway between to Delwood Dr.: node 50125 to node 50112 <br /> 4. Open waterway between W. 37`h and Frederick Ct.: node 50115 to 50107 <br /> S:\PROPOSAL\Prop99\nonumber\upamazon.doc 03/12/99 <br /> <br />