West Yost recently completed the City of Garden Grove’s Water System Master Plan Update. The principal challenges facing the City included aging infrastructure and capacity issues associated with older small-diameter mains. West Yost updated the distribution system hydraulic model, planned and completed a field program to collect hydrant flow test data, calibrated the model pipeline roughness values using the field data, and verified the model comparing model operations to SCADA data. As part of the field program, West Yost piloted the use of ESRI Survey 1-2-3 and iPads to streamline data collection, which is now being implemented for other projects.
West Yost also performed hydraulic evaluations for normal operations, fire flow, and several emergency scenarios, including power outage, earthquake, main break, PFAS contamination, and facilities failure. As part of the Water Master Plan, West Yost completed a SCADA Master Plan update, performed a facilities condition assessment of the City’s wells and pump stations, and prepared an Asset Management Plan. Using the results of the condition assessment, West Yost performed a risk-based analysis to characterize the likelihood of failure, based on the condition ratings for the facilities, and the consequence of failure, based on the facility’s criticality to system operations. The analysis was used to prioritize improvements for the wells and booster pump stations. West Yost developed a $100 million prioritized capital improvement program, identifying improvements for the 2021 – 2040 timeframe.