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kIotz4.l)associates <br />Mr. Ron Bottoms <br />January 18, 2008 <br />Page 4 of 13 <br />Task 2.1 Obtain Hydrologic and Hydraulic Data and Hydraulic Models <br />Obtain Hydrologic Data. Identify and obtain pertinent rainfall -runoff data suitable for planning <br />analyses sufficient to describe rainfall events with 10-, 50-, 100-, and 500-year recurrence <br />intervals. <br />Obtain and Screen Existing Pertinent Hydrologic and Hydraulic Models. Identify and obtain <br />information about available existing hydrologic models (HEC-1 and HEC-HMS) and hydraulic <br />models (HEC-2 and HEC-RAS) for the City watercourses which may not have been already <br />obtained from the City as part of Phase 1. Review and screen models to determine if they would <br />be suitable and useable for CWDS develop. A map -based identification of the models which are <br />judged pertinent to the project and are executable will be developed. <br />Assemble Data. Incorporate supplemental data into listing of data created in Phase 1. <br />Task 2,1 Products: <br />Summary descriptions of additional collected data, <br />Text and/or map -based description of flood modeling information and models found <br />pertinent for use in CWDS development. <br />Task 2.2 Describe Existing Flooding Conditions and Problems <br />Review Prior Models. Review results of model screening of Task 2.1. Select models that are <br />appropriate for describing current flooding conditions in areas where significant flooding <br />problems existing and flooding problems require resolution. Make trial executions of the models <br />to assess their results and model suitability for planning. Make final selection of models which <br />will be suitable for CWDS development. <br />Task 2.3 Propose short-term solutions to problems <br />Review the available models/data and other information to propose short-term solutions. <br />Using the available hydrologic and hydraulic models in concert with the input from City staff, <br />staff previous recommendations, from a review of the flooding complaints and of the repetitive <br />loss properties make recommendations to address short-term solutions. <br />