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<br />.......~ <br />:' " i~:; ~ <br /> <br />u. Colonel Dorothy F. Klasse <br /> <br />21 <br /> <br />Table 2. . <br />Increase in Average Monthly Depletions at Farmington Gauge of the Animas River <br /> <br />January 0.5 cfs <br />February 0.5 cfs <br />March 0.4 cfs <br />April 0.3 cfs <br />May 2.7 cfs <br />June 3.9 cfs <br />July 3.3 cfs <br />August 3.0 cfs <br />September 2.4 cfs <br />October 0.3 cfs <br />November 0.1 cfs <br />December 0.1 cfs <br /> <br />. <br /> <br />The greatest reduction in flows would occur during spring runoff and late <br />summer. The Service believes that peak spring flows are very important for <br />maintaining channel geomorphology. creating and providing access to off- <br />channel habitats. stimulating spawning migrations. and preserving suitable <br />spawning substrates. The Project's reduction of San Juan River spring peak <br />flows are quite small but could significantly affect endangered fishes. Over <br />time. the small reduction in spring peak flows could measurably affect the <br />important functions provided by these flows (maintenance of channel <br />geomorphology. creation of off-channel habitats and access to those habitats. <br />stimulation of spawning migrations. and preservation of suitable spawning <br />substrates) if the overall flows are reduced below the threshold flows <br />necessary to maintain these functions. The precise spring peak flows <br />necessary to maintain these functions has not been determined. However. as. <br />evidenced by past water development and population declines of the endangered <br />fishes. it is reasonabl~ to assume that spring peak flows. over a number of <br />years. have been reduced below. to. or near to threshold levels for some or <br />all of these functions. <br /> <br />CUMULATIVE EFFECTS <br /> <br />.. <br /> <br />~ ! <br />