2020 Hydraulic Transient Analysis for the Lake-Based Water Facilities and Transmission System | Region of Peel, ON, Canada

 The Region's water transmission system is a large and complex network consisting of low-lift and high-lift pumping at the water treatment plants and pumping stations and floating storage at reservoirs and elevated tanks. The lake-based system is divided into seven pressure zones, with pumping to upper zones separated by West, Central and East zone areas. East-West hydraulic connectivity and transfer/transmission capacity is maintained in several of the zones. Water is presently pumped throughout the system via two (2) water treatment plants (WTPs) and eleven thirteen (131) pumping stations (PSs), excluding those at the WTPs.  Storage facilities include two (2) clear wells at the treatment facilities, four (4) elevated tanks (ETs) and eleven twelve (121) reservoirs. One additional ET and two additional reservoirs are planned for the future. The system comprises approximately 200 kilometres of transmission mains ranging in diameter from 600 mm to 2400 mm. Transmission and sub-transmission mains transport water from the two treatment plants into the system via the pumping stations. Water is pumped through a hierarchy of pumping stations to reservoirs and elevated tanks that "float" on each pressure zone. Due to increased demands on the system, flow velocities within the transmission system are anticipated to steadily increase, which will increase the potential for high transient pressures.

The goal of the project is to define and standardize the transient protection methods and criteria across the Region, thereby establishing a level of service.  Therefore, a review of the old reports and studies are essential not only to standardize the measures going forward but to also verify if the measures put in place were accurate or not based on the recommendations coming out of this project. The project is to develop a hydraulic transient model for the lake-based water facilities and transmission system and utilize the model to undertake a comprehensive hydraulic transient analysis for all south Peel facilities and transmission mains using existing and future demands as per 2018 Master Plan under standardized transient scenarios. Results from the analysis will be used to develop a capital program for additional transient measures required. It is also in the scope to develop an implementation plan for the capital program. All lake-based water facilities, transmission mains and mains that are not classified as transmission but function as one are included in the study.

This project discusses the following:

  • Background Review and Validation
  • Surge Protection Device (SPD) Inventories
  • Watermain Digitization
  • Transient SCADA Data Review 
  • Transient Pressure Monitoring 
  • Transient Protection Methods 
  • Transient Protection Best Practices 
  • Transient Software Evaluation 
  • Transient analysis methodology          
  • Analysis scenario review and development 
  • Transient model development 
  • Transient model and field data comparison


Figure 1 Transient pressure measurement locations

Figure 2 List of model validation scenarios for preliminary InfoSurge model

Table 1 Transient Event Validation Summary





Figure 3 Transient model validation for Zone 2, Herridge event (Location 2E)


Figure 4 Transient model validation for Zone 2, Lorne Park event (Location 6E)

 


Location: Regional Municipality of Peel, ON, Canada

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