25D - AGMT - WATER SYS COMPUTER SRVS

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+ Fire flow requirements —with input from the City Engineering staff, IDM will develop Fire flow requirements per land use category. This will be used for subsequent fire flow capacity analysis, which will become a factor in pipeline replacement planning. IDM has delivered similar planning services to the following sample set of utility customers: • City of Hesperia -CA • City ofAnaheim-CA • Azusa Light & Water -CA Yorba Linda Water District -CA + Apple Valley Ranchos Water Company -CA Build a Robust Hydraulic Model: This stage of the project represents the actual model construction, inclusive of piping, facilities, and non- hydraulic elements. Pipeline Network Construction: IDM will build the distribution system piping directly from the City's geodatabase and maintain all pipes in the OIS within the model (service later exceptions). All piping will be included as necessary to represent the accurate hydraulic representation and performance of the system and facilities, Following completion of model construction, all distribution system piping will be assigned an initial C factor based on material, diameter, and typical industry accepted values. These C-factors will be revisited, and revised if necessary, during the C -factor calibration tests. Station and Facility Construction: IDM will create all valves, valve stations, pump stations, turnouts, groundwater wells, and tanks with detail and careful attention to model representative schematics which are well organized and easy to follow relative to In- out piping at facilities, especially those which include multiple facility elements such as tanks, groundwater wells, booster and valve stations. Valve stations will include all valves with the station for differing sizes, settings, and possible controls to mimic appropriate responsiveness during calibration towards the operational goals of this model. Pump stations will be developed In a similar fashion as the valves and valve stations, focusing on the necessary detail specific for hydraulic modeling 2. different in -out piping, sizes, controls, and possibly differing pressure zones within the station. Groundwater wells will be modeled similar to pump stations. Tanks are referenced in the City's geodatabase as points and can be Imported and modeled directly, unless there are multiple tanks at a site location which may need to be modeled with more detail, If this is the case, the same methodology mentioned above for facilities will also apply to tanks. Naming Conventions: Unique Identifiers will be used for all model elements. Naming conventions for elements will follow "IN" and "OUT" naming conventions for in and out piping. This is beneficial for 1) performing mass balance for multi - pressure zoned systems, 2) "tagging" SCADA elements for output results comparison againstexfernal databases, and 3) ease of reporting and mapping (as the "IN" or "OUT" portion of the ID can be queried and separated from other elements). Ctuality Assurance Steps: Upon finalizing facility construction, IDM will perform a thorough review of the model via tables, maps, and hydraulic model results (if available) to confirm reasonable input. Bookmarks will be utilized to perform a visual inspection of the completed facilities for ease-of- understanding schematic layouts. Status of this activity will be visited on the bi -weekly conference calls and progress reported via the weekly email updates. Pressure Zone Attribution IDM will utilize the City's hydraulic schematic for the water distribution system and attribute all facilities with its HGLzone designation. Recommendations and Assumptions; a) It is assumed that for zones which have gravity storage, the HGL is represented by the pad elevation of the lowest tanks + maximum water level of that tank, It Is assumed that for zones that operate from pumping only, the HGL is represented by the drawdown of the pump + the TDH of the pump, per latest efficiency tests, " IDMODELINGO to We can be mere, together. 25D -14