WBSD 2011 Collection System Master Plan
The primary purpose of this sewer collection system master plan (Master Plan) is to evaluate the District’s gravity sewer collection system under a specific design storm, using a computerized hydraulic model.
This Master Plan is comprised of eleven chapters, including a sample Capital Improvement Program which is updated and budgeted for annually. The Master Plan also recommends a schedule for maintenance-related replacements of the pipeline and pump station facilities.
The Master Plan was developed to meet the following objectives:
• Evaluate system wide flow characteristics to identify areas contributing to high inflow and infiltration (I&I);
• Assess the existing hydraulic capacity of the collection system, including pipelines and pump stations;
• Evaluate pipeline and pump station condition and replacement needs; and
• Develop a prioritized capital improvement program (CIP) and funding approach to provide an affordable and sustainable level of service to the District’s ratepayers.
WBSD Master Plan Update of 2013
In 2011/12, the District completed a second flow monitoring program to document any flow reductions resulting from the Haven Avenue and other District projects. The hydraulic model was then recalibrated and results re-evaluated to determine whether Master Plan recommendations should be adjusted based on the updated information.
This Technical Memorandum (TM) discusses the 2011/12 flow monitoring data and how this information affected hydraulic model results. This TM also discusses a revised approach to the management and accommodation of wet weather flows, and includes the following sections:
• 2011/12 Flow Monitoring Program and Recalibration of Basin 2B
• Recalibration Results for District Service Area
• Revised Approach to Wet Weather Flow Management
• Updated Capital Improvement Program
• Next Steps