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REV: 11-19-25 LR reaches), and other portions of the interior pipe systems as needed to develop a new Refined Model. b. The Consultant will refine the model for the purposes of this project as necessary based on the review above and based on new data obtained. The Consultant will refine the Creek Model portions using the information gathered through data collection and field investigation efforts. Refinements will include updates to creek geometry and top of bank elevation profile, adjusting culverts and bridges, and adding private property bridge crossings. The creeks will be modeled using a high resolution 2D mesh. The consultant will stitch creek aerial survey to the County 1-meter Lidar to refine creek geometry and bank profiles. The overbank areas including streets will be modeled using the County 1- meer Lidar data. For the reaches upstream of El Camino Read, the consultant will selectively add large storm drainage trunks to these upstream watersheds to more accurately simulate the flows that reach the creeks and the flows that are conveyed in the streets. c. Consultant to perform a proper hydrologic and hydraulic model calibration that will consist of matching the model to historical data, such as low gage data, maintenance records, and anecdotal observations. The Refined Model will provide a platform to develop independent and soundly calibrated hydrologic and hydraulic parameters. The Consultant has previously calibrated the ELLA Model and will use this data for a preliminary calibration of the Refined Model. The Consultant will refine the model’s hydrologic and hydraulic parameters iteratively first using quality checked historical data available in the ELLA Model. The Consultant will then use the data collected in Task 4 for final model calibration to ensure accurate model performance. The intent is to refine the model parameters so that the model’s depth and flow results match the historical and monitored data before further analysis is conducted using hypothetical design storms. The Creek Model used storm drain outfalls as points of concentration to delineate creek watersheds. As part of his task, the consultant will further sub-divide the outfall drainage areas and adjust hydrologic parameters as needed in the calibration. d. Hilly open space in the Bay Area typically contributes base-flow and interflow after storm events. Therefore, the Consultant will further calibrate the catchments for City’s facilities to reflect the actual base- flow, interflow, and the total storm peak flow and to accurately reflect the actual performance of the flood system. d.Task 5.a.3 Document Model: Consultant to develop a technical memorandum that will serve as a chapter in the Watershed Study that documents the development, refinement, and calibration of the Refined Model. Deliverables: Refined and Calibrated Model (ICM Infoworks), Technical Memorandum for model development and calibration (PDF). ATTY/AGR.2025.317/Wood Rodgers, Inc. (Page 19 of 77)