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Cookstown - Innisfil Creeks water quality survey 1980

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Title: Cookstown - Innisfil Creeks water quality survey 1980
Author: Choo-Ying, A. V.
Abstract: The water quality survey of Cookstown Creek and Innisfil Creek was carried out to provide background information in anticipation of an application for a certificate of approval for a proposed water pollution control plant for the Village of Cookstown. The data from this report would be used eventually to set preliminary effluent guidelines for this plant. Cookstown and Innisfil Creeks support a fishery consisting mainly of bait fish. The predominant stream water use is for irrigation and there are several locations on Innisfil Creek where water is extracted for this purpose. The approved combined maximum rate of extraction could amount to the major portion of the flow in the stream during the low flow period. Although not observed, there is cattle watering from the streams. The water quality for both streams met the Provincial Water Quality Objectives or Guidelines for some parameters and violated others. Total phosphorous concentrations were particularly high, and the geometric mean bacteria densities exceeded the objectives for body contact recreational uses. The waters were alkaline and combined with high temperatures, an ammonia rich effluent input could cause exceedance of the objective for un-ionized ammonia. Cookstown Creek is not a suitable receiver for the treated effluent from the proposed water pollution control plant because of the lack of stream flow. During dry periods, zero flows do occur, e.g., on July 15, 1980 at Station 2 (02ED110). Innisfil Creek is a more suitable receiver because of greater flows. The minimum average day flow for 1980 was 124 litres per second at Station 6 (02ED109); but since the 1980 summer-fall flows were higher than normal, based on the flow records for Station 02E0003 on the Nottawasaga River at Baxter (1948-1980), during years drier than 1980, lower flows could be expected. Then again, the major portion of the flow could be utilized for irrigation. The effluent from the proposed plant would require a high degree of treatment to maintain a water quality in the receiving stream consistent with the Provincial Water Quality Objectives. Of the effluent quality parameters, ammonia is of prime concern because of its toxicity to fish. Similarly, chlorine is of concern if it will be used as the disinfecting agent.
Date: 1982
Rights: Queen's Printer for Ontario, Crown Copyright, Non-Commercial Use Permitted
Rights Holder: Queen's Printer for Ontario
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