City-Wide Drainage Study Revised Scope of Services 01-28-08

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kIotz4l)associates Mr. Ron Bottoms January 18, 2008 Page 6 of 13 impediments to identify where conceptual drainage problems solutions may be needed. Professional judgment will be used to determine the degree of detail in making these evaluations. Refine Description of Future Potential Drainage and Flooding Problems. Assess potential growth of City and apply engineering judgment to identify likely problems assuming no significant change in drainage system capabilities, using the following procedures: Discussion with knowledgeable City personnel or other governmental agencies suggested by the City or which may be suggested by information developed in Task 1.1. Assessment of the identification of existing drainage and flooding problems and their implications for future drainage conditions. • Estimate of future land use conditions arising from land development and infill. a Assessment of implications of development of future transportation systems and improvements. • Selected execution of hydraulic models modified to reflect likely possible future conditions. Performing supplemental hydrologic and hydraulic calculations as necessary and appropriate. Task 2.5 Products: Map -based description (incorporating hydraulic modeling results) of current critical flooding conditions or identified drainage problems. A summary discussion and tabulation of identified critical or key drainage problems and issues, for both current and future conditions. Task 2.6 Plan for Field Survey Evaluate Field Survey Needs. Identify field survey data needs in view of initially assembled information and the anticipated character of analyses needed to identify existing and future drainage and flooding problems. The definition of survey needs will recognize the planning level character of the project, and is not intended to provide a basis for detailed design. Survey data will be collected only in areas where data is needed but is insufficient to perform planning level analyses to assess flooding and surface drainage problems. For modeling purposes, existing model data will be used unless there is question in the validity of the model data and confirmation of field conditions is needed for execution of a model in a particular area. Prescribe Field Survey Scope. In light of survey needs, provide to the selected surveyor detailed information on survey and needed information. Specify the level of detail that is needed,