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<br />METI-IOD <br /> <br />The Montana Method is so brief it can be typed on a 3" x 5" card. <br /> <br />It can be applied rapidly to many segments of thousands of streams <br />by referring to Table 1 of this paper and surface water records of <br />the U.S. Geological Survey (U.S.G.S.). y <br /> <br />The following intensive use of this method will produce a factual, <br /> <br />conclusive, streamflow study on any stream. First, determine the <br /> <br />average annual flow of the stream at the location(s) of interest <br /> <br />(listed as AVERAGE DIScr~GE by U.S.G.S. and hereinafter called <br /> <br />average flow). If the average flow isn't published by the U.S.G.S., <br />they can quickly calculate it for you. Visit the stream and observe, <br /> <br />photograph, sample, and study flow regimens approximating 10%, 30%, <br /> <br />and 60% of the ave:rage flow. Other flows can be studied, but these <br /> <br />three regimens will cover a flow range from about the mintmum to <br /> <br />near the maximum that can normally be justified and reconnnended to <br /> <br />protect the natural environment on ~ost streams (fig. 1). <br /> <br />If the flow is not controlled, study U.S.G.S. records for flow patterns, <br />then go to the field and check their gage(s) until you can view and <br /> <br />study natural flows approximating 10%, 30%, and 60% of the average flow. <br /> <br />If flows are controlled, begin by having the highest flow you wish to <br /> <br />study released first, then regulate so that each succeeding lower flow <br /> <br />1f <br />, <br /> <br />will begin the following midnight. Photos taken early the next morning <br /> <br />.... <br /> <br />l! Water Resources Data for (name of state), Part 1. Surface Water <br />Records, United States Department of the Interior, Geological Survey. <br /> <br />2 <br />