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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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The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT).
The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT). The hydraulics and hydrology research program at the TFHRC Federal Highway Administration's (FHWA) R&T Web site portal, which provides access to or information about the Agency’s R&T program, projects, partnerships, publications, and results.
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