Regional Low Flow Frequency Relations for Central Ontario
2005
McLean, Robert K. | Watt, W Edgar
Reliable regional low flow frequency relations were developed for central Ontario using two easily determined parameters: basin area and a dimensionless baseflow index. Regression models were developed for two measures of low flow: the median 7-day low flow and the ratio of the 20-year to the median 7-day low flow. The dependent variables were determined from single station low flow frequency analyses of 7-day low flow series at 38 hydrometric stations in central Ontario that are classified as natural flow. A second model for predicting median 7-day low flow was derived using three physically based parameters as predictor variables: area, mean basin slope and the area of permeable soil. Use of these physically based parameters is a promising alternative to using the baseflow index. While the models described apply only to the region for which they were developed, and only within specific ranges of predictor variables, the approach described could be used in other areas.
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