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Project: Lyons Quarry BS Date: 2/27/2016 <br /> KR Subject:Scour Analysis Date: <br /> Task: Regime Scour <br /> Job#: No: <br /> Equation source Computing Degradation and Local Scour for Bureau of Reclamation <br /> Station 29589 <br /> Average Scour(Lacey, <br /> Neill,and Blench) 7.12 ft <br /> Neill Scour <br /> Z 0.60 0.5 for straight reach,0.6 for moderate bend,0.7 for severe bend <br /> d, 3.13 Bankfull depth <br /> of 110.06 Design discharge per unit width <br /> q. 28.76 Bankfull discharge per unit width <br /> m 0.85 Exponent varying from 0.67 for sand to 0.85 for coarse gravel <br /> d, 5.88 Depth of scour <br /> Lacey Scour <br /> Z 0.50 0.25 for straight reach,0.5 for moderate bend,1.25 for vertical rock bank <br /> Q 4233.87 Flow rate in channel at design discharge <br /> f 12.93 <br /> d� 54.00 Mean grain size in mm <br /> d, 1.59 Depth of scour <br /> Blench Scour <br /> Z 1.00 0.6 for straight,1.0 for moderate bend,1.25 for vertical rock bank,right angle bends <br /> of 110.06 Design discharge per unit width <br /> Fba 4.50 From Figure 9 in Computing Degradation and Local Scour <br /> d5o 54.00 Mean grain size in mm <br /> d, 13.91 Depth of scour <br /> D,MEDIAN DIAMETER OF BED MATERIAL(MM) <br /> 01 ID 10 100 1000 <br /> 100 <br /> E <br /> ¢ au¢ / <br /> 10 50 0« <br /> LL 20 <br /> o c <br /> m to m <br /> 08 <br /> W 06 H <br /> n N 0<: <br /> = 1.0 S <br /> = 02 u W <br /> J <br /> O <br /> S 1; <br /> OI <br /> 0.0001 0.001 0.01 oo.t 1.0 .O - <br /> D,MEDIAN DIAMETER OF 9ED MATERIAL (it) <br /> CHART FOR ESTIMATING FDo (AFTER BLENCH) <br /> Figure 9. - Chart for estimating Fbo (after Blench, 1969). <br />