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r r r r To Build a calibrated hydraulic Adftk model requires multiple City data sources to be involved. The City has provided Its GIs, which included the water network layer, facility locations, water quality, and leakage history. Additionally, the city has provided consumption data, sampled and summarized from its largest users. Data Collection: To achieve the mission statement of this project and key objectives, assessment requires a thorough review of the different facets of City data that touch and impact the hydraulic model, including the following: • GIs • Consumption • Operational data • SCADA • System Hydraulics Data observations: The RFP references Top 15 users, and the Top 10 service meters were provided. The accuracy of this data may be in error. For instance, one of the top 10 users provided, "Chroma Systems" has 8 different meters, all with the same address, that are located at eight different locations across the service area. These meters are called out as commercial with dumpster, single family dwelling, apartments with dumpster, and reclaimed water. "Chroma Systems" appears to be industrial. IDM has assumed that the City will provide updated service meter data information for demand allocation, especially considering Top 15 users. Plant: This stage of the project represents foundational planning, which will be used as the basis for hydraulic model calibration and future analysis. 0 Technical Memorandum (TM) #1 — Performance Criteria: Planning and operational criteria will be used to identify hydraulic deficiencies and modes of operations for subsequent calibrations and analyses. The performance criteria will determine levels of service and direct the focus of improvements relative to deficiencies, and fire flows 2. Implementation Plan will drive capacity requirements. As such, planning is required to understand and define the City's performance criteria, and fire flow requirements. IDM will utilize the City's past Master Plans, performance criteria from comparable systems, and conversations with Engineering and Operations staff to understand acceptable levels of service. IDM will establish criteria for planning, including pipeline velocities, headloss, and service pressures. IDM will also determine operational criteria for facilities, including frequency of runtimes, tank drain rates, low alarm levels, acceptable water age across the system. Additionally, IDM will coordinate with Orange County Water District to identify the City's current existing pumping allocation, and utilize this as a criteria for future operational scenarios. Technical Memorandum (TM) #2 — Hydraulic Model Development Best Practices. IDM will recommend best practices for model development to ensure a hydraulic model that converges consistently lie, generates reasonable results vs. producing errors due to disconnects and imbalanced simulations). Model Development, Hydraulics and Model Software Observations: Hydraulic grade lines, sound operational logic controls, hydraulically balanced control valve settings, and most recent pump efficiency tests are at the root of consistent, successful model simulations and convergence. The City of Santa Ana experiences over pump cycling due to pressurized operations with limited extended gravity storage for the system to "breathe ". With such constraints, operational logic controls on pumps, settings on valves, and pump curves play a hyper - sensitive role in system and hydraulic model convergence. • IDM will evaluate the hydraulics of the system from an operational perspective, while also adjusting hydraulic modeling software parameters to create flexibility within the hydraulic algorithm to give the City's model the best chance at completing a simulation, consistently, and accurately. }�IDMODELINGQ) We can be more, together. 8