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<br />!!!,s igfl...i:ons i de ,c at ion-"_c!"E _ glanJl'c_Llrnp_r~vem~-,,- t. <br /> <br />The recommended channel improvemenu; have been confined mostly to <br /> <br /> <br />Firs": Creek downstream of Highway 2. No channel improvements are pro- <br /> <br /> <br />posetj for Tril)utary T. The flood channel will tJe grass lined except in <br /> <br /> <br />reaches where the side slopes are steep. A Manning's rugosity value of <br /> <br /> <br />O.03~~ has beerl used in the design of the fl()od c:hannel. A flatter side <br /> <br />slope of 4H:lV has been used except near structures where the slopes <br /> <br /> <br />have been steepened. Suitable riprap protection has been provided <br /> <br />where the side slopes are steep c The depth of flow has been limited to <br /> <br /> <br />less than 10.0' for the 100-year flood i~ most of the reachesc For the <br /> <br /> <br />gras,; lined channel with silt-clay type sed:_rnent load the maximum per- <br /> <br /> <br />missJ.ble mean channel velocities are limitecl te) about 8.5 ft./sec. The <br /> <br />top "idth of the left and right banks .of the flood channel will be <br /> <br /> <br />IScO' c Suitable transitions should be provided at locations where the <br /> <br /> <br />flood channel terminatesc <br /> <br />III_ell <br />