Analysis and Management of Stormwater Quality: A Case Study of the Town of Jasper in Alberta, Canada

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Authors
Sofijanic, Ana
Keyword
Stormwater Management , Stormwater Quality Monitoring , Best Management Practices , Stormwater Modelling
Abstract
Stormwater pollutants can have deleterious impacts on the aquatic life of receiving waterbodies. The aim of this thesis is to present the findings from stormwater quality monitoring and modelling performed for the Town of Jasper in Alberta, Canada. This research was conducted in order to understand the stormwater quality issues in the Town and propose Best Management Practices to reduce stormwater impacts to the aquatic life of receiving waterbodies. A monitoring program was conducted over a period of a year, and samples were collected at major outfalls in the Town for various weather events. The objective of the monitoring program was to identify key pollutants of concern and to characterize impacts to sensitive surrounding aquatic ecosystems downstream of the Town. A total of 14 stormwater quality parameters were found to be of high concern to aquatic life, particularly total suspended solids (TSS), metals and phosphorus (TP). TSS concentrations were statistically correlated with metals and TP by using a Spearman rank correlation. It was found that vehicular traffic was a major source of metals and that winter road salting was responsible for excessive chloride concentrations. High hydrocarbon loads were traced to the oil leaks associated with the high volumes of traffic during the tourist season and fecal coliforms were largely present due to the fecal droppings of the resident Elk population. A Stormwater Management Model (SWMM) was developed to assess the performance of street sweeping and infiltration trenches to reduce TSS loads in the stormwater in Jasper. Two catchments models were developed for the Town using long-term meteorological data, as well as watershed and drainage system data provided by the Municipality. The quality parameters were calibrated so that TSS loads at the outfalls were within a 20% error of monitoring data. The performance of proposed Best Management Practices (BMP) was assessed using single-event and continuous data simulations. A combined sweeping/trench control scenario was recommended for implementation as it generated the highest removal efficiency of up to 51%. The modelling results were used in support of a stormwater management plan to protect the sensitive ecosystems and waterbodies that surround the Town of Jasper.
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