South Campus Stormwater Detention Facility Detailed Design Report
Creators: name: Rizzo, Kayle
name: Stewart, Jason
name: Mann, Tyler
name: Eccles, Jordan
name: Dhillon, Dilveer
name: Luk, Brian
Publisher: name: The University of British Columbia
Year: 2017

description: Stormwater modeling has indicated that significant flooding may occur on the University of British Columbia’s (UBC) South Campus under an intense rainfall. This is of concern to the university, since the quantity and quality of stormwater from such an event may cause damage to UBC assets and also threaten streams that carry this water to the ocean. A 10-year or 100- year flood on campus could lead to cliff failure along the southeast banks due to erosion, and may also damage the riparian habitat. An improved stormwater management system is required to mitigate flooding and environmental damage during large storms. KREW Hydraulic Consulting has developed a detailed design for a stormwater detention facility that manages the 10-year and 100-year stormwater flows from the South Campus at UBC. Some of the key criteria and considerations in the development of the detailed design include effectively designing the stormwater detention tanks, achieving LEED Gold water treatment requirements, and planning the construction of the retention pond. The design consists of three underground detention tanks strategically placed throughout the south catchment and a single large retention pond. The underground detention tanks are located at Thunderbird Arena, the RCMP parking lot, and Save-On-Foods. The retention pond is situated near the intersection of SW Marine Dr. and Wesbrook Mall, as this location will allow the pond to collect and store water from all regions of the catchment. The detention tanks are sized to hold water from a 25-year flood event, and the retention pond is large enough to handle any additional water above a 25-year and up to a 100-year flood event. By utilizing underground retention tanks, it is ensured that the retention pond remains dry for the majority of rainfall events, allowing the retention pond to be used for storage and other site operations. A treatment system will be implemented to ensure the stormwater will meet all environmental regulations and requirements before it is discharged into the ocean. KREW Hydraulic Consulting has completed the detailed design report, which includes final construction plans and specifications for the performance of the stormwater detention system. Detailed engineering calculations and drawings for the project are included as appendices. The current construction schedule consists of 128 working days from May to October 2016, and the total cost of the project is approximately $2.54 million. 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.”