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0 To Build a calibrated hydraulic
<br />model requires multiple City data
<br />sources to be Involved. The City
<br />has provided its GIs, which
<br />Included the water network layer,
<br />facility locations, water quality,
<br />and leakage history. Additionally, the City has
<br />provided consumption data, sampled and
<br />summarized from Its largest users.
<br />Data Collection. To achieve the mission
<br />statement of this project and key objectives,
<br />assessment requires a thorough review of the
<br />different facets of City data that touch and impact the
<br />hydraulic model, including the following:
<br />• GIs
<br />• Consumption
<br />• Operational data
<br />• SCADA
<br />• System Hydraulics
<br />Data observations: The RFP references Top 15 users,
<br />and the Top 10 service meters were provided. The
<br />accuracy of this data may be in error, For instance,
<br />one of the top 10 users provided, "Chroma systems"
<br />has 8 different meters, all with the same address, that
<br />are located at eight different locations across the
<br />service area. These meters are called out as
<br />commercial with dumpster, single family dwelling,
<br />apartments with dumpster, and reclaimed water,
<br />'Chrome Systems" appears to be industrial. IDM has
<br />assumed that the City will provide updated service
<br />meter data information for demand allocation,
<br />especially cor sidering cop 15 users,
<br />t Plen1: This stage of the project represents
<br />foundational planning, which will be used as the basis
<br />for hydraulic model calibration and future analysis.
<br />� Technical Memorandum (TM) #1 —
<br />Performance Cdter1w Planning and
<br />operational criteria will he used to
<br />identify hydraulic deficlencles and
<br />modes of operations for subsequent
<br />calibrations and analyses, The performance criteria
<br />1 will determine levels of service and direct the focus of
<br />1 improvements relative to deficiencies, and fire flows
<br />2h
<br />will drive capacity requirements. As such, planning is
<br />required to understand and define the City's
<br />performance criteria, and fire flow requirements,
<br />IDM will utilize the City's past Master Plans,
<br />performance criteria from comparable systems, and
<br />conversations with Engineering and Operations staff
<br />to understand acceptable levels of service, IDM will
<br />establish criteria for planning, including pipeline
<br />velocities, headless, and service pressures. IDM will
<br />also determine operational criteria for facilities,
<br />in hAding frequency of runtimes, tank drain rates, low
<br />alarm levels, acceptable water age across the system,
<br />Additionally, IDM will coordinate with Orange County
<br />Water District to Identify the City's current existing
<br />pumping allocation, and utilize this as a criteria for
<br />future operational scenarios,
<br />Technical Memorandum (TM) #2 —
<br />Hydraulic Model Development Best
<br />Practices, IDM will recommend best
<br />practices for model development to
<br />ensure a hydraulic model that
<br />converges consistently (le, generates reasonable
<br />results vs. producing errors due to disconnects and
<br />imbalanced simulations).
<br />Model Development, Hydraulics, and Model
<br />Software Observations: Hydraulic grade lines, sound
<br />operational logic controls, hydraulically balanced
<br />control valve settings, and most recent pump
<br />efficiency tests are at the root of consistent,
<br />successful model simulations and convergence, The
<br />City of Santa Ana experiences aver pump cycling due
<br />to pressurized operations with limited extended
<br />gravity storage for the system to "breathe ".
<br />With such constraints, operational logic controls on
<br />pumps, settings on valves, and pump curves play a
<br />hyper=sensitive role In system and hydraulic model
<br />convergence..
<br />IDM will evaluate the hydraulics of the system
<br />from an operational perspective, while also
<br />adjusting hydraulic modeling software
<br />parameters to create flexibility within the
<br />hydraulic algorithm to give the City's model the
<br />best chance at completing a simulation,
<br />consistently, and accurately.
<br />%> iIDMODELINGO
<br />we car be more, together.
<br />2501-12
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