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REV: 11-19-25 LR Task 6. Hydrologic and Hydraulic Analysis, up to $76,700 Time and Materials (T&M) Under this task, the Consultant will conduct a systematic capacity analysis of the Redwood Creek system to identify and to prioritize deficiencies using the calibrated mode. This task includes: a.Task 6.a Analysis: the Consultant will document the design storms and tidal boundary conditions developed in the criteria section as a technical memorandum that will serve as a section in the Watershed Study report. b.Task 6.a.2 Run Current Design Storms with Tidal Boundary Conditions: the Consultant to run the current 30- and 100-year design storms for the existing drainage conditions (without improvements). The design storms (specially a 100- year) will likely introduce new instabilities in the calibrated model. This is because most of the historical storms are typically smaller than 100-year storms, and the models will be testing new areas of the hydraulic simulation. Therefore, an effort to stabilize the models once again will be required. The Consultant will couple the simulated design storms for the current climate with current tidal boundary conditions to daily and extreme tides as coincident events. Extreme tides will have significant impacts to deficiencies in the lower reaches of the project area, and tidal events will govern near the Bay. The frequency or recurrence interval of the improvement benefits are going to be a function of both (coincident) tidal and precipitation frequencies or recurrence intervals. Primary and secondary Technical Reviews will be conducted throughout the identification of deficiencies and will be documented. Primary technical reviews will be conducted by an experienced modeler/engineer, and the secondary review will be conducted by a Principal Engineer from the Consultant’s team. c.Task 6.a.3 Run Future Design Storms with Future Tidal Boundary Conditions: the Consultant will run the future 30- and 100- year design storms for the existing drainage conditions (without improvements). Efforts to stabilize the models will be required. The model runs will include a suite of future design storms that reflect increases to precipitation coupled with future tidal boundary conditions that reflect SLR. d.Task 6.a.4 Develop Existing and Future Capacity Deficiency Maps: Consultant to use the criteria for deficiencies established in the previous task 5 to address both capacity and structural condition. The model will be used to identify deficiencies in the open channel systems for the existing and future conditions. Findings from the Sea Port Center recently completed by BKF will be incorporated along with BCDC and OneShoreline SLR projections, to evaluate current and future capacity deficiencies. The GIS geodatabase will allow for detailed representation in Deficiency Maps that reflects the results of the modeling efforts. The Deficiency maps will show the location open channel infrastructure where the above criteria are not met. ATTY/AGR.2025.317/Wood Rodgers, Inc. (Page 20 of 77)