Abstract

In carrying out watershed studies, one of the key parameters of Conservation and New York concern for causing a degraded fishery is elevated temperatures. Urban drainage discharges contribute to the problem, since the runoff and stormwater pond releases often have elevated temperatures. This chapter presents a practical tool for evaluating these impacts for use on small watersheds. A simple equilibrium-based temperature model was applied in the Laurel Creek Study in southern Ontario. Practical examples are presented of temperature balance calculations at the head of a stream reach, longitudinal and diurnal variations in the reach, effects of varying canopy, and the impact of channel modifications.

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