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Home My WebLink About20070295 Ver 6_8.06 Energy Dissipation Culvert 1_20191220HY-8 Energy Dissipation Report External Energy Dissipator Parameter Value Units Select Culvert and Flow Crossing Crossing 1 Culvert Culvert 1 Flow 59.25 cfs Culvert Data Culvert Width (including multiple barrels) 4.0 ft Culvert Height 4.0 ft Outlet Depth 2.10 ft Outlet Velocity 7.47 ft/s Froude Number 0.91 Tailwater Depth 2.10 ft Tailwater Velocity 5.65 ft/s Tailwater Slope (SO) 0.0285 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 = 0.193 ft D50 of the Riprap Mixture 1.167 ft DMax of the Riprap Mixture 1.917 ft Results Brink Depth 2.216 ft Brink Velocity 8.300 ft/s Depth (YE) 1.992 ft Riprap Thickness 2.876 ft Riprap Foreslope 3.8340 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 0.586 D50/YE Check D50NE is OK Basin Length (LB) 16.000 ft Basin Width 14.667 ft Apron Length 4.000 ft Pool Length 12.000 ft Pool Depth (HS) 0.000 ft TW/YE 1.055 Tailwater Depth TW 2.101 ft Average Velocity with TW 1.495 ft/s Critical Depth (Yc) 0.769 ft Average Velocity with Yc 4.752 ft/s Downstream Riprap for High TW Distance: 1 LB Velocity 6.497 ft/s Size 0.275 ft Distance: 2 LB Velocity 4.508 ft/s Size 0.132 ft Distance: 3 LB Velocity 2.996 ft/s Size 0.059 ft Distance: 4 LB Velocity 2.243 ft/s Size 0.033 ft