Civil engineers for a better world
Author: Pierre Y Julien Publisher: Cambridge University Press Year: 2002 Link(s): Google Books Preview Subjects: Riprap, Rivers This textbook offers a thorough mechanical analysis of rivers from upland areas to oceans. It scrutinizes state-of-the-art methods, underlining both theory and engineering applications. Each chapter includes a presentation of fundamental principles, followed with an engineering analysis and […]
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Author(s): E.V. Richardson, D.B. Simons, P.F. Lagasse Publisher: FHWA Year: 2001 Link(s): PDF Subjects: aggradation, degradation, alluvial channel, alluvial fan, river training, geomorphology, headcutting, lateral migration, riprap, sediment transport, scour, stable channel design, countermeasures The Federal Highway Administration document “Highways in the River Environment – Hydraulic and Environmental Design Considerations” was first published in […]
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4. PAVEMENT DRAINAGE (Based on HEC-22, Third Edition, revised August 2013) Effective drainage of highway pavements is essential to the maintenance of highway service level and to traffic safety. Water on the pavement can interrupt traffic, reduce skid resistance, increase potential for hydroplaning, limit visibility due to splash and spray, and cause difficulty in steering […]
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Author(s): Scott A. Brown, Eric S. Clyde Publisher: FHWA Year: 1989 Links: PDF, SI Version Subjects: Riprap, Revetments, Bank Protection, Gabions, Grouted Riprap, Riprap Design, Precast Concrete Riprap, Paved Linings One of the hazards of placing a highway near a river or stream channel is the potential for erosion of the highway embankment by moving […]
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Water flows in a sloping drainage channel because of the force of gravity. Flow is resisted by the friction between the water and wetted surface of the channel. The quantity of water flowing (Q), the depth of flow (y), and the velocity of flow (V) depend upon the channel shape, roughness (n), and slope (S). […]
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This has been superseded by Caltrans New Riprap Classes. D50 Equivalent Spherical Diameter RSP Class D50Size1 D50Weight inches pounds 8 Ton 71 17600 4 Ton 56 8800 2 Ton 45 4400 1 Ton 36 2200 1/2 Ton 28 1100 1/4 Ton 23 550 Light 16 200 Facing 12 75 Backing No 1 12 75 […]
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Flow conditions in a closed conduit can occur as open-channel flow, gravity full flow or pressure flow. In open-channel flow the water surface is exposed to the atmosphere. Gravity full flow occurs at that condition where the conduit is flowing full, but not yet under any pressure. Pressure flow occurs when the conduit is flowing […]
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Source: FP-14 Standard Specifications Author: FHWA Table 705-1 Gradation Requirements for Riprap(1) Class % of Rock Equal or Smaller by Count Range of Intermediate Dimensions,(2) Range of Rock Mass,(3) DX inches (millimeters) pounds (kilograms) 1 100 9 – 15 (230 – 380) 59 – 270 (27 – 120) 85 7 – 11 (180 – 280) […]
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INLET CONTROL EQUATIONS A.1 INTRODUCTION This appendix contains the inlet control equations used to develop the design charts of this publication (HDS-5). Section A.2 contains the equations for the unsubmerged and submerged inlet control equations. Section A.3 demonstrates how the Section A.2 equations are used to create dimensionless design curves for culvert shapes with coefficients […]
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10.2 RIPRAP APRON The most commonly used device for outlet protection, primarily for culverts 60 in (1500 mm) or smaller, is a riprap apron. An example schematic of an apron taken from the Central Federal Lands Division of the Federal Highway Administration is shown in Figure 10.4. Figure 10.4. Placed Riprap at Culverts (per Central […]
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