South Campus Stormwater Detention Facility : Final Design Report

The purpose of this report is to present a detailed design solution for controlling and eliminating flood damage at vulnerable locations in University of British Columbia (UBC). Through hydraulic modeling data, it has been shown that UBC currently does not have adequate infrastructure to manage extreme flood events; in particular, the South Campus may experience extensive flood damage such as property damage, riparian habitat deterioration, cliff erosion, and ultimately cliff failure. The design process consists of an overview of regulatory guidelines, technical standards, and stormwater model simulation results to identify requirements and constraints of the detailed design. The design solution is comprised of two separate stormwater management systems located at Hampton Place and Southwest (SW) Marine Drive. The selected design for both systems is underground, pre-cast concrete stormwater detention tanks connected to the existing stormwater system using gravity mains. This report discusses the design configuration, elevation profiles of storm mains, and the structural and hydraulic capacity of the design. The proposed storm mains are designed based on the locations of the existing stormwater infrastructure and requirements defined by the UBC Technical Guidelines, including velocity and slope restrictions. The reinforced concrete tanks are sized to withstand lateral and surface loading. Finally, the target design lives of the facilities are determined based on the estimated lifetime of facility components, maintenance requirements, and the probability that it will be in use. Several iterations were undertaken to ensure the final design is an optimal solution, meeting all identified requirements. At the Hampton Place facility, stormwater will enter the 1,200 cubic metre detention facility to prevent flooding and protect emergency services in the case of a storm. At the SW Marine Drive facility, a large volume of flooding is anticipated, hence the detention facility has a storage capacity of 3,226 cubic metres. Stormwater collected from an existing storm main running along Wesbrook Mall will be diverted into this facility. When the rainfall intensity decreases, the water will gradually be released back into an existing storm main, eliminating flooding while minimizing pollution. 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.”Applied Science, Faculty ofCivil Engineering, Department ofUnreviewedUndergraduat