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Author(s): USACE Publisher: USACE Year: 1991 Link: PDF, USACE Publications Subjects: Channels, Flood control Size: 183 pages, 2.29 MB This manual presents procedures for the design analysis and criteria of design for improved channels that carry rapid and/or tranquil flows. Procedures are presented without details of the theory of the hydraulics involved since these details […]
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HEC-15 Section 6.2 – PERMISSIBLE SHEAR STRESS Values for permissible shear stress for riprap and gravel linings are based on research conducted at laboratory facilities and in the field. The values presented here are judged to be conservative and appropriate for design use. Permissible shear stress is given by the following equation: τp = F*.(γs […]
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HEC-15 Section 6.1 – MANNING’S ROUGHNESS Manning’s roughness is a key parameter needed for determining the relationships between depth, velocity, and slope in a channel. However, for gravel and riprap linings, roughness has been shown to be a function of a variety of factors including flow depth, D50, D84, and friction slope, Sf. A partial […]
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Caltrans Highway Design Manual Commonly accepted values for Manning’s roughness coefficient are provided in Table 866.3A. The tabulated values take into account deterioration of the channel lining surface, distortion of the grade line due to unequal settlement, construction joints and normal surface irregularities. These average values should be modified to satisfy any foreseeable abnormal conditions […]
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Author(s): James D. Schall, Everett V. Richardson, and Johnny L. Morris Publisher: FHWA Year: 2008 Links: PDF Subjects: Hydrology, hydraulics, highway drainage, open channels, roadside ditches, pavement drainage, inlets, conduits, culverts, storm drains, energy dissipators Hydraulic Design Series No. 4 provides an introduction to highway hydraulics. Hydrologic techniques presented concentrate on methods suitable to small […]
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Author(s): Kilgore RT, Cotton GK Publisher: FHWA Year: 2005 Links: PDF Subjects: channel lining, channel stabilization, tractive force, resistance, permissible shear stress, vegetation, riprap, manufactured linings, RECP, gabions Flexible linings provide a means of stabilizing roadside channels. Flexible linings are able to conform to changes in channel shape while maintaining overall lining integrity. Long-term flexible […]
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