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EXHIBIT 1 <br /> CITY OF SAN MARCOS <br /> MIDTOWN DRAINAGE IMPROVEMENTS - PRELIMINARY ENGINEERING <br /> SCOPE OF SERVICES <br /> b. TxDOT Coordination will follow the Local Government Project Procedures(LGPP)as <br /> required by TxDOT. KFA will also schedule meetings with appropriate TxDOT staff to <br /> fully understand project constraints and limitations due to TxDOT ROW and easements <br /> within the project limits. <br /> 5. Data Collection <br /> a. KFA will collect and review data related to the storm sewer and drainage within the <br /> overall project area. City provided reports, GIS data,as-builts, and existing models will be <br /> reviewed and incorporated into the analysis at the discretion of the Engineer. Data <br /> collection included in the Phase I scope is not included in this scope. <br /> b. KFA will perform site visits to visually inspect specific areas and features within the <br /> project area. One(1) site visit is anticipated for this scope with one to include City staff to <br /> discuss project design elements and constraints. KFA will document site visits with field <br /> reports and organized photos. <br /> 6. Environmental Services <br /> Environmental services will be provided by subconsultant Cox I McClain Consulting, Inc. in <br /> accordance with their attached proposal. <br /> 7. Drainage Analysis <br /> a. A high level rapid assessment will be run for the project area.An Infoworks ICM"rain on <br /> mesh"simulation drops a rainfall hyetograph directly onto a 2D surface. Collected <br /> existing storm sewer GIS data will be imported into the model. Previous models created <br /> by the City will be reviewed and utilized as applicable. The results from the"rain on <br /> mesh"simulation will be utilized to develop the hydrologic and hydraulic parameters for <br /> the detailed analysis. <br /> b. Existing Conditions Hydrology <br /> 1. KFA will utilize all available information to develop overall sub basin boundaries, <br /> times of concentration, runoff losses,and rainfall data and build a detailed <br /> hydrologic model. KFA will develop preliminary peak flow rates for up to five(5) <br /> specified design storms according to the City criteria for each identified point of <br /> interest. <br /> 2. Runoff hydrographs for up to three(3) historical flood events will be developed. <br /> The City and the Engineer will agree upon the flood events and where rainfall <br /> and flow data will be acquired prior to the analysis. <br /> c. Existing Conditions Hydraulics <br /> 1. A modeling node and link network will be developed to represent storm drain <br /> inlets, manholes, conduits, culverts, bridges, and detention ponds in the project <br /> area. Offsite systems and private systems will be aggregated and simplified. The <br /> existing storm sewer network will be developed and verified from the existing City <br /> models,as-built data, field visits, City GIS data, project survey, and other City <br /> provided data. The storm sewer network will be developed and documented <br /> using GIS. <br /> 2. The most up-to-date Blanco model will be utilized for the 2D hydraulic model <br /> tailwater development.The City and KFA will agree upon the tailwater <br /> assumptions and methods selected for incorporation into the 2D hydraulic model. <br /> KFA will utilize the City provided ICM model of the Blanco River to include inflow <br /> hydrographs for the 100-year event to simulate creek flooding from the Blanco <br /> 2 <br /> Page 12 of 20 <br />