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Report: The Use of Prescribed Percentages of Mean Annual Discharge to Recommend Instream Flows for Fish in British Columbia (The Montana Method Revisited)
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If you have any questions on the information presented, or require additional report data or attachments, please contact the Report Contact
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When there is a need to make quick appraisals of the instream flows required for fisheries, an empirical method based on prescribed percentages of the mean annual discharge can be useful. Properly applied, this method is based on
field observations of streams that are like the ones for which instream flow recommendations are to be made.
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Author: Newcornbe, C. P.; Ptolemy, R. A.
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Date Published: Mar 1985
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Report ID: 15767
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Audience: Government and Public
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When there is a need to make quick appraisals of the instream flows required for fisheries, an empirical method based on prescribed percentages of the mean annual discharge can be useful. Properly applied, this method is based on
field observations of streams that are like the ones for which instream flow recommendations are to be made. These observations document the suitability
of instream flows for fish (and other users of instream flows) at various instantaneous discharges representing a broad range of percentages of the mean annual discharge, from less than 10% to 200%.
The method assumes that the condition of fisheries habitat on other streams --large or small --in similar biogeoclimatic zones is comparable when the instantaneous discharges, expressed as percent of the mean annual discharge, are the same. If this assumption is valid, the consequences of proposed short-term changes in a stream's discharge can be known beforehand. The proven capacity to make such predictions gives this method credibility and makes it a logical successor to the method most widely used today--raw subjective assessment.
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Report Type
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Fish and Aquatic Habitat Information |
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Subject
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Region - Province Wide |
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Fish and Fish Habitat - Impact Assessment |
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Fish and Fish Habitat - Management |
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Water Information - Hydrometric / Hydrology |
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Water Information - Water Management |
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