Significant new material in this edition includes chapters on sediment transport concepts and channel stability in gravel bed streams, as well as expanded coverage of channel restoration concepts.
Author: U.s. Department of Transportation
Publisher: Createspace Independent Pub
Approximately 500,000 bridges in the National Bridge Inventory (NBI) are built over streams. A large proportion of these bridges span alluvial streams that are continually adjusting their beds and banks. Many, especially those on more active streams, will experience problems with aggradation, degradation, bank erosion, and lateral channel shift during their useful life. The purpose of this document is to provide guidelines for identifying stream instability problems at highway stream crossings. Techniques for stream channel classification and reconnaissance, as well as rapid assessment methods for channel instability are summarized. Qualitative and quantitative geomorphic and engineering techniques useful in stream channel stability analysis are presented. This publication is an update of the third edition published in 2001. The HEC-20 manual covers geomorphic and hydraulic factors that affect stream stability and provides a step-by-step analysis procedure for evaluation of stream stability problems. Stream channel classification, stream reconnaissance techniques, and rapid assessment methods for channel stability are covered in detail. Quantitative techniques for channel stability analysis, including degradation analysis, are provided, and channel restoration concepts are introduced. Significant new material in this edition includes chapters on sediment transport concepts and channel stability in gravel bed streams, as well as expanded coverage of channel restoration concepts.
Full color, richly illustrated book. The purpose of this document is to provide guidelines for identifying stream instability problems at highway stream crossings.
Author: Federal Highway Administration
Full color, richly illustrated book. The purpose of this document is to provide guidelines for identifying stream instability problems at highway stream crossings. Techniques for stream channel classification and reconnaissance, as well as rapid assessment methods for channel instability are summarized. Qualitative and quantitative geomorphic and engineering techniques useful in stream channel stability analysis are presented.
This document provides guidelines for identifying stream instability problems at highway stream crossings and for the selection and design of appropriate countermeasures to mitigate potential damages to bridges and other highway components ...
This document provides guidelines for identifying stream instability problems at highway stream crossings and for the selection and design of appropriate countermeasures to mitigate potential damages to bridges and other highway components at stream crossings. The HEC-20 (Hydraulic Engineering Circular No. 20) manual covers geomorphic and hydraulic factors that affect stream stability and provides a step-by-step analysis procedure for evaluating stream stability problems. Guidelines and criteria for selecting countermeasures for stream stability problems are summarized, and the design of three countermeasures (spurs, guide banks, and check dams) is presented in detail. Conceptual design considerations for many other countermeasures are summarized.
This collection contains 75 papers and 321 abstracts presented at conferences sponsored by the Water Resources Engineering (Hydraulics) Division of ASCE from 1991 through 1998.
Author: Everett V. Richardson
Publisher: ASCE Publications
Sponsored by the Water Resources Engineering (Hydraulics) Divsion of ASCE. This collection contains 75 papers and 321 abstracts presented at conferences sponsored by the Water Resources Engineering (Hydraulics) Division of ASCE from 1991 through 1998. The collection contains many new and expanded versions of the original papers and is designed to assist the practitioner with the concepts in evaluating stream instability and scour at bridges. Topics include: history of bridge scour research; bridge scour determination; stream stability and geomorphology; construction scour; instrumentation for measuring and monitoring; field measurement; computer and physical modeling of bridge scour; scour at culverts; and economic and risk analysis. One important paper contains 384 field measurements of local scour at piers made by the U.S. Geological Survey.
... 2 : Stream Stability at Highway Structures ; and HEC - 23 : Bridge Scour and
Stream Instability Countermeasures . ... to state highway agencies that is
necessary for completing comprehensive scour and stream instability evaluations
for the ...
Papers presented at the Fifth International Bridge Engineering Conference, April 3-5, 2000, Tampa, Florida.
QUANTITATIVE TECHNIQUES FOR STREAM STABILITY ANALYSIS P.F.
LAGASSE , S.A. SCHUMM , AND L.W. ... Evaluating Scour at Highway Bridges (
Richardson and Davis 1995 ) ; and Stream Stability at Highway Structures , HEC
- 20 ...
Author: International Association for Hydraulic Research. Congress
Publisher: Amer Society of Civil Engineers
This catalogue presents a complete survey of the surviving autographs of Handel's music--more than 7,500 leaves in the composer's hand written over a perod of nearly fifty years. Works and movements for which autographs survive are identified, and essential information about the physical characteristics are recoded, including the watermark type for each leaf of paper, the types of rastra employed, and the presence of pencil annotations. All watermark types are illustrated with full-size diagrams.
( Continued ) Bridge scour and stream instability countermeasures ( Lagasse et
al . ... 20 : Legesse , P.F.J.D. Schal , F. Johnson , E.V. Richardson , F. Chang ,
1996 , " Stream Stability at Highway Structures , Hydraukc Engineering Circular
Author: Ben Chie Yen
The main objective of this project is to investigate channel protection techniques, especially those with low-cost and low-maintenance, for control of channel migration near bridge approaches. Such low cost techniques are more applicable to small streams than to large rivers. A literature review was conducted. Channel migration is mitigated either through protection of the bank and/or bed erosion and considerable deposition, or through instream structures to redirect the flow, or both. Useful control techniques include: instream structures such as bendway weirs, riprap and masonry revetment, bioengineering techniques such as willow posts, and geosynthetic membranes. Advantages and disadvantages of these techniques are summarized. Based on the information obtained from a survey of Illinois bridge sites and under the guidance of the Technical Review Panel, four sites were selected for further study of applicability of the protection techniques. For every site it has been identified that the meander pattern of the stream is a major factor for the scour and flow action endangering bridge safety. Therefore, the general goals of the suggested alternative actions are to stabilize and/or improve the stream meander alignment and to control and protect against local bank scour. The alternatives for a site range from positive "active" control structures to "passive" protection and sediment deposition enhancement. Generally, the more "active" alternatives are more costly but have less failure risk when compared to the more "passive" alternatives.
Because highway engineers lack the proper tools to address increased
regulatory concerns regarding stream channel stability ... FHWA HEC - 20 “
Stream Stability at Highway Structures ” provides an overview and methodology
for analyzing ...
This Circular contains twenty-seven research problem statements developed by the TRB Committee on Hydrology, Hydraulics, and Water Quality (A2A03). Much of the effort toward the development of these statements was accomplished at the Committee's summer meeting, July 22 and 23, 1996, in Baltimore, Maryland. This Circular updates and replaces TRB Circular 405, which was the previous compilation of Research Problem Statements by the Committee.
4 . Hydraulics Engineering Circular No . 20 , “ Stream Stability at Highway
Structures , ” second edition , November 1995 . 5 . Hydraulics Engineering
Circular No . 23 , “ Bridge Scour and Stream Stability Countermeasures , ” July
1997 . 6 .
Author: Steven R. Abt
Publisher: Amer Society of Civil Engineers
The 320 papers present new approaches for developing and protecting the water resources industry, incorporating symposia on groundwater management, channel restoration, bridge scour, stream bank protection, and the hydraulics and hydrology of wetlands. Other themes include case studies of reducing and preventing hydrologic disasters, applying geographical information systems in surface water hydrology, impinging jets, drainage design, endangered species and their impact on reservoir operations, applying artificial neural networks, managing the inflow and outflow of reservoirs, free surface flow model verification, dam foundation erosion, methods to monitor and evaluate non-point sources, effects of dam failure (only one paper needed there), sediment behavior, modeling watershed runoff, and contaminant monitoring. Reproduced from typescripts. The two volumes are paged and indexed together. Annotation copyrighted by Book News, Inc., Portland, OR
FHWA's Hydraulic Engineering Circular No. 20 , Stream Stability at Highway
Structures ( FHWA , 2001a ) provides additional guidance on stream stability
assessment for transportation projects . 3.1 Visual Stability Assessments Visual
Author: Bruce M. McEnroe
KDOT occasionally finds it necessary to realign short reaches of small streams in connection with highway improvements or to protect the highway embankment against stream encroachment. A realigned stream reach should be stable and should resemble a natural stream in its cross section, profile and planform. The Kansas Analytical Method of natural stream design, developed in this report, follows the general approach recommended by the USACE and the NRCS, and incorporates hydrologic and geomorphic data from natural streams in Kansas. The realigned reach is designed to convey the same bankfull discharge and sediment load as a stable reach directly upstream. The channel length, slope, and cross-sectional dimensions are obtained from an analytical solution to Manning's equation for uniform flow and a simplified version of the Meyer-Peter and Muller sediment-transport equation, along with hydraulic-geometry relations for the bankfull width. A meandering planform with the computed length and an appropriate meander wavelength is constructed of circular arcs and line segments. A saw-tooth bottom profile with riffles and pools at appropriate locations is recommended to provide aquatic habitat during periods of little or no flow. Step-by-step instructions for stream realignment design by the Kansas Analytical Method are provided. An example illustrates the practical application of the method.