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<br />P. Matthies: Portal fl Reclamation Diversion page 4 <br />D. Slopes in the vicinity of the portal are steep, <br />ranging from 40$ on the reclaimed flow area to 46~ <br />in the "natural" channel just above the reclaimed <br />portal. <br />E. The steep slopes result in high velocities during <br />the design storm conditions. <br />F. Flow conditions, i.e., depth, velocity, and shear <br />_._. stress are more severe in the "natural" section ~ <br />than on the reclaimed surface. <br />G. The "natural" (undisturbed) portions of the <br />channel were observed to be stable and not <br />undergoing erosion. <br />H. Some minor adjustments will occur in the Swale <br />configuration will occur as water flows in it. <br />This will quickly stabilize because there is a <br />large amount of cobbles and small boulders in the <br />material used for reclamation. A discussion with <br />Larry Routten, Colo. Div. of Minerals and Geology, <br />indicated that localized adjustments in the Swale <br />of about one half foot would not be a problem. <br />CONCLUSIONS <br />Based upon the above information, the following conclusions have <br />been reached: <br />1. The broad Swale that conveys runoff water across the <br />reclaimed surface have significantly lower velocity and <br />shear stress than in the existing "natural" section <br />just above the reclaimed area. <br />2. The "natural" section of the flow channel is obviously <br />stable for the flow conditions that exist in the area. <br />