UBC Undergraduate Research

UBC Stormwater Detention : UBC CCM Multiple Use Stormwater Detention Project Burrows, Luke; Dressel, Emily; Liang, Leona; Shannon, Mike; Stockton, Tim; Volkov, Alexandra


Our team has created this final design report for the UBC CCM Multiple Use Stormwater Detention Project for the University of British Columbia SEEDS Sustainability Program. Enclosed are the outline, design components, design considerations, cost estimate, construction schedule, and detailed drawings/specifications for the project. The UBC Integrated Stormwater Management Plan (ISMP) has established the UBC South Campus area as a critical section that is prone to flooding during heavy storm events and erosion of the surrounding Point Grey cliffs. The primary goals of the UBC ISMP were implemented in the design process. The enclosed project recommends a stormwater detention pond beside the UBC CCM building that will receive and detain the 100-year rainfall event from the UBC south catchment basin. The stormwater detention pond was designed with a natural systems design approach that would be minimally invasive to the surrounding area while acting as a multiple use area. The existing site is a densely forested area that is the point of lowest elevation and the most feasible area to collect stormwater for the south catchment basin. Stormwater runoff will be redirected to the pond by a culvert tie-in to the existing storm sewers on Wesbrook Mall road. An oil and grit separator will remove pollutants and debris from the stormwater before it enters the pond. The stormwater detention pond is designed to detain the 100-year storm runoff volume of 3000 cubic metres. A unique control structure located on the opposite side of the pond releases the runoff at a greatly reduced flow rate to decrease scouring and erosion downstream. Once exiting the storm pond, the runoff enters a series of bioswales along SW Marine Drive that naturally filter and clean the runoff before entering Booming Ground Creek which feeds into the Pacific Ocean. Our team recommends the project be constructed over the summer months of May to August, 2019, in order to mitigate risk of construction impacts during the busy school year. A final construction schedule has been created that begins with site mobilization on May 1, 2019 and conclude with final commissioning during the middle of August, 2019. After performing a Class D cost estimate, the client can expect to budget $794,750.00 for the construction of all aspects of the stormwater detention pond with an annual maintenance cost of $23,800.00. 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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