UBC Undergraduate Research

Stadium Neighborhood Underground Parkade and Water Storage Ehrenholz, Alan; Rothfels, Eric; Bonderud, Erik; Huang, Karin; Liu, Monica; Jones, Trevor


We have prepared a detailed design report for the University of British Columbia (UBC), Campus and Community Planning department, as part of the Social, Ecological, Economic Development Studies program. Our team has been retained as the owner’s engineer on the Stadium Road Neighbourhood Underground Parkades and Water Storage project. This report will provide a summary of work completed, including stormwater analysis, geotechnical considerations, hydraulic analysis, culvert design, parkade design, and construction plan, construction schedule, and financial costs. The project has both primary and secondary objectives. The primary objective of the project is stormwater management of the site area, and the secondary objective is the design and integration of a parkade into the Stadium Neighbourhood. To meet client requirements, both daily precipitation and emergency storm water events will be included in the stormwater analysis. The parkade design will be inclusive of both current and future residential needs. The majority of the stormwater storage capacity will be provided by a bioswale running between the travel lanes of West 16th Avenue. The bioswale will be 380m in length and range from 6.1m to 10.6m in width. The depth of the swale will be 2m from the top of wall to the top of bedding soil. The bedding soil will be 0.2m deep to allow it to act as an adequate growing median for the plants, including bullrush. The retaining walls of the swale will be 0.15m wide, and 4.3m deep and secure with anchor rods to prevent overturning. The bottom slab of the swale will be 0.45m deep, with 20M rebar at 300mm spacing to provide appropriate structural capabilities. Three pumps in series will recirculate water from the bottom of the swale to the top. In addition, a 2% slope will be maintained through the length of the swale; both of these measures will prevent water from remaining stagnant throughout the swale. A pedestrian crossing will be constructed midway along the length, with an 870mm corrugated steel pipe. The underground parkade will measure 110m by 62m and be integrated into the stadium structure. The parkade will act as event parking, in addition to considering transportation projections and sustainable development. The parkade will require a 250mm thick, 13m deep concrete diaphragm wall with 9m anchor rods. The base slab will consist of 420mm concrete slab with 6-25M rebar, and a 450mm slab with 25M rebar at 80mm will form the roof. In each direction, ten Concrete beams sized 800mm x 400mm with 4-25M rebar will carry the loads to 970mm x 970 mm columns with 12-20M rebar. The parkade will replace the current number of stalls that are provided, coming to a total of 150 stalls. This will include 15 electric vehicle charging stations. Finally, the parkade will include 50 class A bike storage spaces. The construction of the bioswale and parkade is expected to take 264 and 511 days respectively. The total project time is expected to be 796 days with 3 months of weathering allowance. The construction cost is estimated to be $3.16M for the swale, $4.97M for the parkade, $4.67M for fees and contingency, and a total cost of $12.8M. A service life maintenance plan yielded annual costs of $7k and $17k for the swale and parkade respectively. Converted to net present value over the 100-year design life yields a cost of $570K, bringing the total lifetime project cost to $13.4M. 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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