Our Client’s Opportunity:
The Village of Harrison Hot Springs (The Village) is located in the Fraser Valley among the Coastal Mountains on the southern shore of the 65-km long Harrison Lake. The Village is serviced by a sanitary network comprised of approximately 12-km of sanitary piping, 6 lift stations, and one siphon. The main trunk runs along McCombs Drive crossing the Miami River at the Hot Springs Road bridge. The Sanitary system outlets from Pump Station 1 (PS 1) to the Waste Water Treatment Plant (WWTP). The existing storm system infrastructure spans across 24 major catchment areas, primarily discharging into the Miami River. The stormwater is conveyed through approximately 10 km of storm pipes and ditches and is directed to 22 separate outfall locations.
A Liquid Waste Management Plan (LWMP) provides an opportunity for the community to develop a long-term plan for building, financing, and managing their liquid waste infrastructure. The LWMP forms the implementation plan for the management of liquid waste from collection, through treatment and resource recovery, to residual disposal. The LWMP will act as the controlling framework for the capital planning and improvement schedule storm and sewage infrastructure.
The Village recognizes the challenges ahead, and commissioned CTQ Consultants to generate a comprehensive LWMP to review the current system in its entirety and provide a roadmap for the storm and sanitary infrastructure upgrades over the coming years.
The purpose of the LWMP is to establish a strategy for providing the optimum levels of service to the tax payers of the community now and in the future. This will be accomplished by updating information from previous studies and reports by utilizing current sophisticated software. The seasonal variations in demands, due to the tourist traffic surges during the summer months, significantly impact the complexity of the analysis.
Careful planning and integration of water, sewage and stormwater infrastructure can minimize
environmental impacts, reduce life cycle costs and provide flexibility for future expansion or upgrade of facilities. Asset management is essential for the long-term investment in infrastructure represented in a LWMP where components are often designed for 50 to 100 years of service. Infrastructure such as storm and sanitary sewers, on-site sewage disposal systems, storm runoff detention and infiltration systems, water supply pipelines, pump stations, treatment plants, industrial pre-treatment facilities, and outfalls must be treated as interrelated systems. There were three main stages to the LWMP process, namely:
Stage 1: Define Problems and Identify Options
Stage 2: Develop and Evaluate Preferred Options
Stage 3: Document and Adopt the Plan
Existing and future storm and sanitary system demands were reviewed and modeled by Autodesk Storm and Sanitary Analysis ™ (SSA) software. The impact of developing to the full vision of the Zoning Bylaw of 2015 and combining various growth scenarios were investigated. The model was used to quantify upgrades to the pipe network, outfalls, pump stations, and the WWTP. Seasonal effects, pipe capacity, and minimum velocity analysis impacts were quantified, facilitating recommendations for future improvements.
A comprehensive LWMP Report was developed which highlighted the key findings from the infrastructure system modelling scenarios. The model data was used to identify deficiencies in both the existing storm and sanitary systems and determined scenarios that could occur as the Village continues to expand. Improvement projects and cost estimates were outline to mitigate the found deficiencies. Based on servicing requirements and public health and safety, a priority rating was given to each project to indicate the recommended completion date.
To complete this task, the following information was produced to support the main objectives of the LWMP:
- Sanitary and Storm Cross-Connection Assessment
- Operation and Maintenance Recommendations
- Rainfall Criteria Development
- Sanitary Waste Reduction Techniques
- Stormwater Treatment Guidelines
- Storm Water Reduction Techniques
- Development Guidelines
- DCC Best Management Practices