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Last modified
11/23/2009 1:42:34 PM
Creation date
10/4/2006 9:35:50 PM
Metadata
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Template:
Floodplain Documents
County
Mesa
Community
Collbran
Stream Name
Plateau Creek
Title
Plateau Creek Flood Analysis
Date
1/1/1984
Prepared For
Mesa County
Prepared By
Greenhorne & O'Mara, Inc.
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br />I <br />II <br />II <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br /> <br />A suggested stream flow tabulation form (Figure 3) is included in this <br />report. To use the form the staff gage readings at the bridges are entered in <br />columns 1 and 3. This reading, in feet above the channel bottom, can be <br />converted to a discharge, in cubic feet per second, by using Figures 1 and 2. <br />Intersect the appropriate curve with the gage height reading and read the <br />corresponding discharge off the other axis. <br /> <br />SANITARY SEWER LINE <br /> <br />In order to provide adequate protection of the sanitary sewer line adjacent <br />to Plateau Creek during high flows some form of armoring or encasement should be <br />considered. In the situtation where it is necessary to cross the stream channel <br />with the sewer line the pipe should be encased in concrete. An example detail <br />of a reinforced concrete encasement is shown in Figure 4. <br /> <br />In areas where the sewer line runs near the stream bank and could <br />potentially be exposed by erosion during high flows the stream side of the pipe <br />should be protected. A reasonable method of protection in these areas would be <br />riprap. The rock should be of appropriate gradation with d50=16". It should be <br />approximately two and one-half feet thick and should not create a side slope <br />greater than 1.5:1 adjacent to the stream channel. <br /> <br />5 <br />
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