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UBC Undergraduate Research

Stadium Neighborhood Underground Parkade and Water Storage Chiang, Grace; Fan, Shanyao; Ku, Jason; Lim, Chong Keng (Daniel); Wong, Ka Cheng (Kevin); Shen, Peggy; Zhou, Yan


Our team has been acquired to design municipal infrastructure improvements for the future Stadium Road Neighborhood (the Neighbourhood) in the University of British Columbia (UBC) Vancouver campus. This project targets to reduce stormwater runoff from new impervious area as a result of new development, to mitigate potential overland flooding during major storm events, and to improve quality of stormwater discharge. Our team is taking a natural system approach for stormwater handling through detention facility, bioswales, rain gardens and other green infrastructures as outlined in the UBC Integrated Stormwater Management Plan (ISMP). Stormwater management will be carried out through integration with an underground parkade and transportation improvements on West 16th Avenue. The scope of work is as follows: 1. Create a stormwater management plan for both onsite and offsite; 2. Design a mixed-use underground parkade with stormwater detention; and 3. Include stormwater management into an upgraded road network The stormwater management plan for the Neighbourhood aims to achieve net zero in pre- and post-development stormwater run-off for a 1/100 year storm. This will be done through an underground detention facility that will prevent stormwater contamination and control flow levels. Rational method was used to calculate the stormwater detention volume and three detention design options were conceptualized. The preferred option was then developed and features a detention facility designed for small storms located adjacent to the underground parkade beneath the new Thunderbird Stadium and will overflow and accommodate a 1/100 year storm event. The detention facility was designed using EPASWMM and is 470 m³ with a v-notch weir opening into the parkade. A flow control manhole is located immediately downstream of the detention facility to discharge water back into the storm system at pre-development 1/100 year release rate. An oil/grit separator serves as an additional water treatment method. Onsite stormwater will be collected at the lowest point of the site through gravity flow and conveyed to the detention facility upstream via a pump system. Additionally, a permanent wetland will be built on the southwest corner of the development site to serve as a transfer station for stormwater while mimicking a natural habitat for nearby species and allowing sediments to settle and be treated before being released offsite. The parkade access is via W 16th Ave. The layout of the parkade is one-way traffic flow with 120 angled parking spaces including spaces for electric vehicle charging and car-share. The parkade is fully accessible with handicap stalls and an elevator. The building envelope of the parkade includes waterproofing and durability measures such as waterproof membrane, capillary break aggregate drainage layer, and a traffic-grade membrane for corrosion. Improvements to the adjacent transportation network include a redesign of W 16th Ave with separated bike lanes and transit/HOV priority lanes to better support sustainable travel modes and accommodate future population and density growth. Bioswales and other green infrastructure are integrated into the design to improve streetscape and achieve further reduction in stormwater runoff. 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.”

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