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3.1 Vegetated Channel Designs <br />Inputs to the channel utility sub-routine for vegetated channels include: <br />• peak flow <br />• channel slope <br />• channel geometry (shape; bottom width [as appropriate]; side slope) <br />• xetaxdance class <br />• freeboard <br />Vegetated channels tend to become unstable when flow velocities exceed four (4) to five (5) feet <br />per second. <br />Channel Slooe <br />The steeper the slope the lower the allowable velocity. The channel slopes were determined by <br />direct measurement from Drawing 1, 01d Wolf Creek Remediation Plan Map. <br />Channel Geometry <br />SCC assumed the vegetated section of Channel PL-1 is triangular, or V-shaped configuration, <br />with a 4H:1V side slope. <br />Retazdance Class <br />The reclamation seed mixture SCC uses to revegetate reclaimed areas results in a mixed grass <br />community. Consequently, the vegetation type selected as the model input is mixed grass. The <br />flow resistance varies by grass type and stem length. Retazdance classes have been divided into <br />five classes designated by A, B, C, D and E. SCC (1986) developed guidance fox selection of <br />appropriate vegetation xetardance classes and they are outlined in Table 2, Gxzde to Retardance <br />Clar.r Selection. <br />TABLE Z <br />Guide to Retardance Class Selection <br />Stand Length of Vegetation <br />inches Retardance Class <br />Good (70-100% Ve etative Cover <br /> >30 A <br /> 1 1 - 24 B <br /> 6-10 C <br /> Z-6 D <br /> <2 E <br />Fair (30-70% Ve etative Cover) <br /> >30 B <br /> I 1 - 24 C <br /> 6-10 D <br /> 2-6 D <br /> <2 E <br />Old Wolf Creek area Remediation Plan 4 Revised 06/07 <br />