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H <br />and to furnish irrigation water for the golf course. This task includes the design <br />of the flow control structure. <br />Storfnivater Model — Develop a separate stormwater network within the current <br />combined system model (InfoSWMM) for the infiastructure proposed as part of <br />the Northwest Stormwater Separation design. The results from the WWHM <br />model will be included in the InfoSWMM model. <br />InzproveMents Validation — The storinwater and sewer system will be modeled <br />simultaneously and the impact of the separation of flows will be <br />evaluated. Compare the model results after improvements with existing <br />conditions. Currently identified size of improvements will be revised as required <br />to achieve the desired level of service. <br />Sensitivity Analysis — The system will be evaluated for up to 3 design storms <br />(likely 25-, 50- and 100 -year occurrence interval with short duration) over a 24 to <br />48-hour period to determine the level of protection under extreme storm <br />occurrence conditions. The duration and final configuration will be discussed <br />with the City. — <br />5.4 Workshop with City Staff — Conduct a workshop with City staff to review existing <br />conditions based on data collected and hydraulic modeling results. Confirm project <br />goals and objectives and refine as necessary to accommodate existing conditions. An <br />additional iteration of modeling may be required after this workshop to revise <br />proposed improvement locations and associated sizing. <br />5.5 Documentation — A technical memorandum will be developed that describes the <br />stornnwater model development and the validation of the existing combined sewer <br />model. The documentation will include the improvements validation modeling that <br />will describe the flows conveyed both before and after the construction of the <br />Northwest Stormwater Separation project. A draft and final will be delivered to the <br />City. <br />5.6 Internal QA/QC— Perform in-house Quality Assurance/Quality Control (QAIQC) <br />review of the modeling assumptions, results and documentation prior to submitting to <br />the City for review. <br />Assumptions: <br />1. The storrnwater model for the collection system will be developed using <br />InfoSVV'NM and will be set up within the City's existing combined sewer <br />model. <br />2. For the design of the pond and control structure the WWHM will be used. <br />3. City will direct MSA in the use of a design storm. <br />4. Citi will provide historical flow meter irzfo_rmation. If additional flow data is <br />required, the City will install meters at locations identified by 1ASA. <br /><ulitAri ort needed to process _�z,v 1o�data is not __.1_ded t the scope <br />,o <br />Of budget. <br />25 <br />�r R. g. = i, �1`�✓llr �_C;=�' 1' e r \Ci lli�A 2�L C.OilllV�d3f'Cl' Slgjara Licn <br />Cat "eYe tL i� �_ i <br />