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Grade Control Section Rock Size Selection <br />River Sta <br />Q Total <br />(cfs) <br />Min Ch EI <br />(ft) <br />Mann Wtd <br />Chnl <br />W.S. Elev <br />(ft) <br />Max Chl <br />Dpth <br />(ft) <br />Vel Chnl <br />(ft/s) <br />Top Width <br />(ft) <br />Froude # <br />Chl <br />Centerline <br />Radius <br />(ft) <br />Calculated <br />D30 Size <br />(in) <br />HEC -RAS Output - 500- Year Flow Event <br />100 <br />792 <br />8549.3 <br />0.03 <br />8552.86 <br />3.56 <br />18.33 <br />19.25 <br />2.16 <br />Straight <br />50.1 <br />140 <br />792 <br />8552.91 <br />0.04 <br />8557.12 <br />4.21 <br />14.06 <br />21.82 <br />1.51 <br />Straight <br />24.8 <br />150 <br />792 <br />8553.81 <br />0.04 <br />8558.95 <br />5.14 <br />10.3 <br />25,56 <br />0.95 <br />100 <br />30.9 <br />165 <br />792 <br />8553.84 <br />0.04 <br />8559.77 <br />5.93 <br />8.25 <br />28.71 <br />0.69 <br />60 <br />22.7 <br />HEC -RAS Output -100- Year Flow Event <br />100 <br />405 <br />8549.3 <br />0.03 <br />8551.8 <br />2.5 <br />16.23 <br />14.99 <br />2.22 <br />Straight <br />40.4 <br />140 <br />405 <br />8552.91 <br />0.04 <br />8555.88 <br />2.97 <br />12.44 <br />16.89 <br />1.58 <br />Straight <br />19.9 <br />150 <br />405 <br />8553.81 <br />0.04 <br />8557.54 <br />3.73 <br />8.71 <br />19.93 <br />1 <br />100 <br />19.6 <br />165 <br />405 <br />8553.84 <br />0.04 <br />8558.27 <br />4.43 <br />6.62 <br />22.74 <br />0.68 <br />60 <br />12.7 <br />Radius of approach is approximately 60 ft. but is anticipated to increase due to erosion in upstream in non armored section <br />Grade Control Section from Station 1+25 to 1+65, grade break at 1+46 <br />Use D 30 of approximately 30 inch as basis for sizing rock in control section <br />