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PERMFILE50979
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PERMFILE50979
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Last modified
8/24/2016 10:55:17 PM
Creation date
11/20/2007 2:42:50 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1999050
IBM Index Class Name
Permit File
Doc Date
8/5/1999
Doc Name
TIMNATH CONNELL PIT APPLICATION FN M-99-050
To
DMG
Media Type
D
Archive
No
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The lowering of the water by any adjacent gravel operations <br />will have a detrimental impact and should be required to be <br />monitored and mitigated. The effect of fluctuating water <br />levels are especially difficult for a fisheries management <br />plan. The following information has been provided by Dr. <br />Stephen Flickinger, Head of the Fisheries and Wildlife <br />Management Department of Colorado State University. Dr. <br />Flickinger has been active in the planning and management of <br />the Ponds for more than twenty years. <br />Impacts of Low Water Levels <br />Dr. Stephen Flickinger <br />"Deeper water means cooler water in the summer. In the Fort <br />Collins area rainbow trout generally survive summer <br />temperatures in ponds with 10 feet of depth, but they do not <br />survive in ponds that are 8 feet or less deep. <br />Loss of fish to winterkill is the result of a combination of <br />factors, but shallow water makes winterkill conditions more <br />likely. Shallow water promotes growth of aquatic vegetation <br />which will die back during winter. Bacterial decomposition <br />of the dead plants material requires oxygen. Shallow water <br />equates to small volume of water holding dissolved oxygen for <br />respiration. Hence, depletion of oxygen is likely, and also <br />subsequent winterkill occurs. The duration of ice and snow <br />cover also influences depletion of oxygen. Because typical <br />winters in the Fort Collins s area are relatively mild, ponds <br />can be fairly shallow and still support fish through the <br />winter. Ponds 5-6 feet deep have carried fish through the <br />winter more years than they have not, but certainly there <br />have been years when ponds of that depth have had winterkill. <br />Ponds in the Fort Collins area greater than 8 feet deep have <br />not experienced winterkill. <br />The third impact of low water levels is hard to quantify. <br />Falling water levels during spawning inhibit reproductive <br />behavior, but it is difficult to say how much or how fast the <br />water must drop to disrupt the spawning process. If eggs <br />have already been deposited near shore, a drop of a couple of <br />feet in a few days will expose many of the eggs to drying. <br />There may or may not be additional spawns at the new water <br />level." <br />p <br />
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