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Home My WebLink About20070295 Ver 6_8.10 Energy Dissipation Culvert 3_20191220HY-8 Energy Dissipation Report External Energy Dissipator Parameter Value Units Select Culvert and Flow Crossing Crossing 3 Culvert Culvert 3 Flow 81.58 cfs Culvert Data Culvert Width (including multiple barrels) 5.0 ft Culvert Height 5.0 ft Outlet Depth 2.54 ft Outlet Velocity 6.79 ft/s Froude Number 0.75 Tailwater Depth 2.54 ft Tailwater Velocity 6.98 ft/s Tailwater Slope (SO) 0.0246 External Dissipator Data External Dissipator Category Streambed Level Structures External Dissipator Type Riprap Basin Restrictions Froude Number <3 Input Data Condition to be used to Compute Basin Outlet Velocity Best Fit Curve D50 of the Riprap Mixture Note: Minimum HS/D50 = 2 is Obtained if D50 = 0.179 ft D50 of the Riprap Mixture 1.000 ft DMax of the Riprap Mixture 1.500 ft Results Brink Depth 2.635 ft Brink Velocity 7.777 ft/s Depth (YE) 2.451 ft Riprap Thickness 2.250 ft Riprap Foreslope 3.0000 ft Check HS/D50 Note: OK if HS/D50 > 2.0 HS/D50 0.000 HS/D50 Check HS/D50 is NOT OK Check D50/YE Note: OK if 0.1 < D50/YE < 0.7 Check D50/YE 0.408 D50/YE Check D50NE is OK Basin Length (LB) 20.000 ft Basin Width 18.333 ft Apron Length 5.000 ft Pool Length 15.000 ft Pool Depth (HS) 0.000 ft TW/YE 1.036 Tailwater Depth TW 2.539 ft Average Velocity with TW 1.372 ft/s Critical Depth (Yc) 0.825 ft Average Velocity with Yc 4.949 ft/s Downstream Riprap for High TW Distance: 1 LB Velocity 5.886 ft/s Size 0.226 ft Distance: 2 LB Velocity 4.036 ft/s Size 0.106 ft Distance: 3 LB Velocity 2.683 ft/s Size 0.047 ft Distance: 4 LB Velocity 2.008 ft/s Size 0.026 ft