Recycled Water Hydraulic Model
City of Roseville, California

West Yost provided the City with validation of its recycled water system hydraulic model, which originally was developed by City staff using H2OMAP®. West Yost also provided an extended period model that represents the current operational condition of the recycled water system. West Yost utilized the hydraulic model to evaluate scenarios to optimize the use of recycled water and provided flexibility in the operation of the system for future demands. The resulting work allows operational decisions to be made to reduce wastewater discharges.

The project work included review of the existing recycled water model and review of individual model elements, including node elevations and demands, pipelines, and system facilities. For use in validating the model, West Yost developed a 48-hour diurnal pattern for five separate areas in the City’s existing recycled water system (each area is served by specific facilities) based on SCADA information received from the City.

Based on review of the SCADA information and discussion with City staff, operational controls for each facility were also developed. These facilities included the North Zone RW Pump Station; Dry Creek RW Pump Station at the Recycled Treatment Plant; West Roseville Pump Station; and the Pleasant Grove Pump Station at the Recycled Water Treatment Plant.

An extended period simulation (EPS) scenario was used to verify that the recycled water model was correctly configured and capable of producing results that are consistent with those observed in the field.

The EPS scenario was developed using flow, pressure, and tank level data collected at each facility. To simulate the operational condition at each pump, operational logic control settings were assigned to each pump. West Yost also provided recommendations for future model updates which will strengthen the model’s use as a technical and analytical tool.