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FLOOD09734
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Last modified
1/26/2010 10:10:19 AM
Creation date
10/5/2006 4:36:21 AM
Metadata
Fields
Template:
Floodplain Documents
County
Routt
Community
Routt County
Stream Name
Elk River
Basin
Yampa/White
Title
Streambank Erosion Study Elk River
Date
11/1/1988
Prepared For
Routt County
Prepared By
USDA Soil Conservation Service
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />Bed load - Sediment. that moves by saltation (jumping), roll ing or <br />sl iding in the bed layer of a stream, <br />Bedrock - The sol id rock underlying soi Is and ov..rlying the mantle <br />rock, ranging from surface exposure to depths of several hundred <br />feet. <br /> <br />Bed slope - The incl ination of the channel bottom. <br /> <br />Bituminous mattress - An impermeable rock-, mesh-, or metal-reinforced <br />layer of asphalt or other bituminous material placed on a <br />streambank to prevent erosion, <br /> <br />Blanket - Materi al covering all or portion of a ,treambank to prevent <br />erosion. <br /> <br />Braided stream - A relatively \oIide and shallo\ol stream \oIith multiple <br />channels formed by islands and bars in the .,aterway. <br /> <br />Buffer zones - Areas of trees, grass, or other vegetation located <br />bet\oleen top bank and adjacent pastures or cultivated fields (also <br />called greenbelts), <br /> <br />Bulkhead - A vertical or nearly vertical retaining \01 a I I or structure <br />supporting a natural or artificial streambank, <br /> <br />Cation-exchange capacity (CEC) - The sum total of exchangeable cations <br />that a soi I can absorb; expressed in *mi II iElquivalents per gram <br />or 100 grams of so i I. <br /> <br />Caving - The collapse of a bank by undercutting due to \oIearing a\olay <br />of the toe or an erodible soi I layer above the toe, <br /> <br />Cellular-block mattress - Regularly cavitated interconnected concrete <br />blocks placed directly on a streambank or fi Iter to prevent erosi <br />on. The cavities can permit bank drainage and the growth of <br />either volunteer or planted vegetation \oIhen filter fabric is not <br />used bet\oleen the mattress and bank, <br /> <br />Channel - A natural or man-made \oIater\olay that continuously or <br />periodically passEls flo\ol, <br /> <br />Chemical stabilization - Streambank protection technique involving the <br />appl ication of chemical substances to increase particle <br />cohesiveness and to shift the size distribu~ion to\olard the <br />coarser fraction. The net effect is to imp,"ove the erosion <br />resistance of the material, <br /> <br />Clay - Material passing the No. 200 (0.074 mm) U,S, Standard Sieve <br />that exhibits plasticity (putty-I ike properties) \oIithin a range <br />of \oIater contents and has considerable strength \oIhen air-dry <br /><Unified Soi I Classification System). <br /> <br />Clay blanket - Layer of compacted clay placed ov..r cohesionless bank <br />soi Is to protect them against erosive strearnflo\ol, <br /> <br />64 <br />
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