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UBC Groundwater Emergency Water Supply - Final Design Report

University of British Columbia. Department of Civil Engineering; University of British Columbia. Campus and Community Planning

The University of British Columbia - Social Ecological Economic Development Studies (SEEDS) Sustainability Program has identified a need for an emergency water supply for the UBC Vancouver Point Grey Campus (Campus) to address water demands during a potential seismic event or major service disruption. This report presents the team’s detailed design for an emergency water supply system using groundwater wells. Due to the extensive scope of a full groundwater system, the scope for detailed design was narrowed to focus on the following design components: well design, distribution from wells to reservoir, construction sequencing and scheduling, and cost estimating. The codes and standards used include the UBC Technical Guidelines, the City of Surrey Design Manual and corresponding Master Municipal Construction Documents Supplement, the BC Design Guidelines for Rural Residential Community Water Systems, and the Canadian Concrete Code (CSA-A23.3). The key regulations and acts referenced are the BC Drinking Water Protection Act and Regulation, Groundwater Protection Act, and the Water Sustainability Act. The design features a phased construction approach with seven groundwater wells constructed during Phase 1 and four wells in Phase 2 to meet the anticipated 2050 water demand of 70 L/s for a supply service length of one week. Each well will be fitted with a 250 mm steel casing, 150 mm Grundfos SP- 30-14 submersible groundwater intake pump, 250 mm shutter style well intake screen, 150 mm ductile iron drop pipe to connect the pump to the effluent well check valve, pitless adapter, two 25 mm PVC sounding tubes for observation, and watertight well cap. Adjacent to the well cap will be an above-ground well controls and maintenance house. Electrical and automation controls of the well operations will be designed by an electrical sub-consultant. The distribution mains on East Mall which feeds the flows from the wells to the reservoir are 6” Kubota Earthquake Resistant Ductile Iron GENEX piping to meet required flow and pressure design criteria. Piping from the wells to this feeder main are 8” Kubota GENEX ductile iron piping. A 2700m3 underground reinforced concrete cast-in place concrete reservoir will be located under the pavement space adjacent to the UBC Life Building, with the structural design to be completed by a subconsultant. To meet potable water quality standards, a treatment and controls building will be designed for filtration, removal of iron and manganese, and chlorine disinfection by a process and mechanical subconsultant. A Class A cost estimate was completed for the preliminary design and prices the project at $15.8M with a 5% contingency. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”

Report

eng

2021-07-13

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/78963

Unreviewed

http://creativecommons.org/licenses/by-nc-nd/4.0/