Abstract

Alberta Environment has implemented stormwater quality enhancement requirements for all new development areas in Calgary draining to the Bow River system. Current criteria are expressed in terms of reduction in total suspended solids (TSS) prior to discharge. To date in Calgary the assessment of stormwater quality enhancement has been assessed by continuous simulation using the QHM model.

This chapter presents a review and summary of the technical approach to date in assessing the degree of TSS removal provided by a stormwater storage facility. The current interpretation of total suspended solids with reference to street sweeping sampling is examined and the effect of short-circuiting on TSS removal in a stormwater storage facility is assessed. Suggestions are made to clarify the definition of TSS related to street sweeping sampling and to modify the QHM simulation of stormwater storage facilities to address short-circuiting effects.

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