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If ponding is used, the design must include an appropriate <br />combination of measures such as shading, filtered bottom <br />withdrawal, vegetated Swale discharges or constructed wetland <br />treatment cells that will limit temperature increases. The pond <br />should be designed to draw down in 24 hours or less. <br />Other methods that will minimize any increase in the temperature of <br />the trout stream. <br />- 3 7 - <br />