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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations

Report
This report is an archived publication and may contain dated technical, contact, and link information
Publication Number: FHWA-HRT-07-026
Date: February 2007

Bottomless Culvert Scour Study: Phase II Laboratory Report

Appendix B: Outlet Scour Results

Table 8. Outlet scour results summary.
Date Figure Flow Depth
[cm]		 Velocity
[cm/s]		 Sub-
merged		 Inlet
Wingwall		 Outlet
Wingwall		 Note Width of
Scour Hole
(W) [mm]		 Depth of
Scour Hole
(ys) [mm]		 Distance to
Scour Hole
(L) [mm]
2/11/2003 62 23 14 Yes 45 degree None Bottomless culvert study 446 115 615
2/25/2003 63 10 14 No 45 degree None Bottomless culvert study 278 107 659
3/25/2003 64 12 15 No 45 degree Circular bevel Bottomless culvert study 388 116 618
4/7/2003 65 13 16 No 45 degree Elongated, streamlined bevel Bottomless culvert study 157 59 875
4/29/2003 66 12 15 No 45 degree Short streamlined bevel Bottomless culvert study 330 63 874
7/22/2003 67 12 15 No 45 degree 45 degree Bottomless culvert study 393 116 846
8/6/2003 68 12 15 No 45 degree 8 degree (rough) Bottomless culvert study 323 91 516
10/7/2003 69 12 15 No 45 degree 8 degree (smooth) Bottomless culvert study 249 64 676
12/9/2003 70 12 15 No 8 degree (smooth) 8 degree (smooth) Bottomless culvert study 212 97 470
12/16/2003 71 23 14 Yes 8 degree (smooth) 8 degree (smooth) Bottomless culvert study 258 106 648
10/27/2004 72 23 13 Yes 45 degree 45 degree HGL (hydraulic grade line) for bottomless culverts 556 110 803
11/10/2004 73 23 13 Yes 45 degree 45 degree HGL for bottomless culverts, Chang's pile dissipator at outlet 403 84 663
3/19/2004 74 23 13 Yes 45 degree 45 degree MDSHA Standard Plan, Riprap = 1" 441 122 1,070

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