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i llf It l� ll' « IDM will explore the nuances of the City's hydraulic characteristics /sensitivity and adjust model time simulations accordingly. IDM's experience with hydraulically similar systems indicates that the City's hydraulic model may best be served using a 15- minute time interval for hydraulic simulations. Hydraulics, and the interaction with water assets, drives system operations, and become the explaining factor for system performance, including pipe breaks, water quality issues, customer service issues, and capital improvement projects. Our team represents hydraulics and hydraulic model experts, Paul Hauffen and Patrick Moore, Project Manager and Hydraulics Technical Advisor, respectively, are widely published in the area of hydraulics and water quality, and contributing members of the Engineering Modeling Applications Committee. Paul will lead the Hydraulics Assessment phase of this Project and evaluate critical hydraulic aspects of both system operations and the hydraulic model, including but not limited to: • System hydraulic grade lines (HGLs) • System hydraulic schematics « Locations of zone boundaries « Pump curves and overall efficiencies • SCADA controls for • Booster station and wells, • Interconnects, • Treatment facilities (as applicable) * PRV Settings, and locations • Service area topography • Pipe Break History IDM has analyzed hydraulically similar systems across Southern California, including: • City of Downey -CA City of Lakewood -CA • City of El Centro -CA • Indio Water Authority -CA • City of Brawley -CA 2. Implementation Plan Technical Memorandum (TM) 43 — 0 Demand Development: Hydraulic model demands, usage patterns, and fire flows demands will govern the direction and quantify of water flowing through the City's distribution system and model. Having an accurate understanding of the 1) distribution /allocation of water demand, and 2) the typical hourly water usage, and 3) required fire flow demands per land use category will allow the model to predict areas of high headloss, velocity, or pressure deficiencies, • System Demands — current system demands will be developed from geocoded consumption records, water production, and Top 15 users. Developed from parcel layers and billing records, geocoded to nearest tributary hydraulic model junctions. • Calibration Period — IDM will work with the City to determine the maximum day and average day calibration periods. Based on this, data will be requested and reconciled to base demand periods and diurnal curves (hourly usage). Peaking factors for average day, maximum day, and peak hour (from diurnal curves, see below) will be developed and applied, using historic production records ( SCADA), DWR reports, consumption, and other key data sources. • Diurnal Curves — hourly usage patterns will be developed using a 15- minute interval, and applied for the 72 -hour calibration period determined for maximum day and average day demand conditions. Data will be extracted from SCADA for 24 -hours prior, and 24- hours following, the calibration period. Patterns may be developed and assigned based on specific land uses, by pressure zone, or to the overall system, dependent on best available data. SCADA will be used to generate hourly fluctuations. • Top 15 Users: IDM will contact each of the Top 15 users for usage. IDM will individually allocate usage for the Top 15 users to their respective model junction to ensure they receive a user - specific base demand, hourly usage, and fire flow. We can be more, together, 9