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Most experienced trail crews try to avoid wetlands because of the construction and maintenance problems they pose. Little has been published on wetland trail construction, and materials that are available are often outmoded or are too regionally focused. By pulling this information together from our experiences, we hope to answer questions you didn't even know you had. In this manual we have described the common techniques for building a wetland trail. We have also included information on some of the more unusual materials and tools. Some of the techniques and tools we describe are suitable for wilderness situations where mechanized equipment cannot be used. Others are suitable for urban greenbelts where a wider range of techniques, material, and equipment can be used. Somewhere in between are the back-country sites where machines are permitted, but access and logistics are challenges. Although this book is written for wetland trails, the techniques described can also be used for correcting other poorly drained low areas in existing trails. The manual is written for those who are untrained and inexperienced in wetland trail construction, but those with experience may learn a few things, too.

Traffic control devices (TCDs) are very critical for the safe and efficient transportation of people and goods. The Manual on Uniform Traffic Control Devices (MUTCD), by setting minimum standards and providing guidance, ensures uniformity of traffic control devices across the nation. The use of uniform TCDs (messages, locations, sizes, shapes, and colors) helps reduce crashes and congestion, and improves the efficiency of the surface transportation system. Uniformity also helps reduce the cost of TCDs through standardization. The information contained in the MUTCD is the result of years of practical experience, research, and/or the MUTCD experimentation process. This effort ensures that TCDs are visible, recognizable, understandable, and necessary. The MUTCD is a dynamic document that changes with time to address contemporary safety and operational issues.

The purpose of the MUTCD is to establish uniform national criteria for the use of traffic control devices that meet the needs and expectancy of road users on all streets, highways, pedestrian and bicycle facilities, and site roadways open to public travel.Traffic control devices (TCDs) are very critical for the safe and efficient transportation of people and goods. The Manual on Uniform Traffic Control Devices (MUTCD), by setting minimum standards and providing guidance, ensures uniformity of traffic control devices across the nation. The use of uniform TCDs (messages, locations, sizes, shapes, and colors) helps reduce crashes and congestion, and improves the efficiency of the surface transportation system. Uniformity also helps reduce the cost of TCDs through standardization. The information contained in the MUTCD is the result of years of practical experience, research, and/or the MUTCD experimentation process. This effort ensures that TCDs are visible, recognizable, understandable, and necessary. The MUTCD is a dynamic document that changes with time to address contemporary safety and operational issues.

The Highway-Rail Crossing Handbook, 3rd Edition (Handbook) has been prepared to disseminate current practices and requirements for developing engineering treatments for highway-rail grade crossings (referred to herein as "crossings"). The Handbook is intended to provide practitioners of all levels of knowledge and experience with critical background information and "noteworthy practices" consistent with the 2009 Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD) and more recent guidance developed by recognized subject matter experts. This edition constitutes a substantial update to and revision of the 2007 Handbook and efforts have been made to reorganize the contents.

This manual is intended to provide a technical resource for geotechnical engineers responsible for planning and performing subsurface investigations so that project subsurface conditions can be characterized effectively and risks attributed to ground conditions can be identified and addressed. The manual is organized to reflect an emphasis on interpretation of geotechnical parameters for design and construction. It describes important considerations for planning and scoping of geotechnical investigations; means and methods for classification of soil and rock based on index property measurements; identifying and characterizing problematic soil and rock types for design and construction; guidance for interpretation of soil and rock properties from field and laboratory measurements; interpretation of geotechnical design parameters from individual measurements; identification and characterization of geotechnical hazards; and lastly, guidance for documenting and reporting results from geotechnical investigations.

This document presents information on the analysis, design, and construction of driven pile foundations for highway structures. This document updates and replaces FHWA NHI-05-042 and FHWA NHI-05-043 as the primary FHWA guidance and reference document on driven pile foundations. The manual addresses design aspects including subsurface exploration, laboratory testing, pile selection, aspects of geotechnical and structural limit states, as well as technical specifications. Construction aspects including static load tests, dynamic tests, rapid load tests, wave equation analyses, dynamic formulas and development of driving criteria, as well as pile driving equipment, pile driving accessories, and monitoring of pile installation inspection are also covered. Step by step procedures are included for most analysis procedures and design examples.

This document presents information on the analysis, design, and construction of driven pile foundations for highway structures. This document updates and replaces FHWA NHI-05-042 and FHWA NHI-05-043 as the primary FHWA guidance and reference document on driven pile foundations. The manual addresses design aspects including subsurface exploration, laboratory testing, pile selection, aspects of geotechnical and structural limit states, as well as technical specifications. Construction aspects including static load tests, dynamic tests, rapid load tests, wave equation analyses, dynamic formulas and development of driving criteria, as well as pile driving equipment, pile driving accessories, and monitoring of pile installation inspection are also covered. Step by step procedures are included for most analysis procedures and design examples.

This document presents information on the analysis, design, and construction of driven pile foundations for highway structures. This document updates and replaces FHWA NHI-05-042 and FHWA NHI-05-043 as the primary FHWA guidance and reference document on driven pile foundations. The manual addresses design aspects including subsurface exploration, laboratory testing, pile selection, aspects of geotechnical and structural limit states, as well as technical specifications. Construction aspects including static load tests, dynamic tests, rapid load tests, wave equation analyses, dynamic formulas and development of driving criteria, as well as pile driving equipment, pile driving accessories, and monitoring of pile installation inspection are also covered. Step by step procedures are included for most analysis procedures and design examples.

This course manual is intended for design and construction professionals involved with the selection, design and construction of geotechnical features for surface transportation facilities. The manual is geared towards practitioners who routinely deal with soils and foundations issues but who may have little theoretical background in soil mechanics or foundation engineering. The manual's content follows a project-oriented approach where the geotechnical aspects of a project are traced from preparation of the boring request through design computation of settlement, allowable footing pressure, etc., to the construction of approach embankments and foundations. A complete example bridge project is included.

This course manual is intended for design and construction professionals involved with the selection, design and construction of geotechnical features for surface transportation facilities. The manual is geared towards practitioners who routinely deal with soils and foundations issues but who may have little theoretical background in soil mechanics or foundation engineering. The manual's content follows a project-oriented approach where the geotechnical aspects of a project are traced from preparation of the boring request through design computation of settlement, allowable footing pressure, etc., to the construction of approach embankments and foundations. A complete example bridge project is included.

This book is FHWA's primary reference of recommended design and procurement procedures for shallow foundations. It presents state-of-the-practice guidance on the design of shallow foundation support of highway bridges. The information is intended to be practical in nature, and to especially encourage the cost-effective use of shallow foundations bearing on structural fills. To the greatest extent possible, the document coalesces the research, development and application of shallow foundation support for transportation structures over the last several decades. Detailed design examples are provided for shallow foundations in several bridge support applications according to both Service Load Design (Appendix B) and Load and Resistance Factor Design (Appendix C) methodologies. Guidance is also provided for shallow foundation applications for minor structures and buildings associated with transportation projects.

This book presents state-of-the-practice information on the design and installation of cement-grouted ground anchors and anchored systems for highway applications. The anchored systems discussed include flexible anchored walls, slopes supported using ground anchors, landslide stabilization systems, and structures that incorporate tiedown anchors. This book draws extensively in describing issues such as subsurface investigation and laboratory testing, basic anchoring principles, ground anchor load testing, and inspection of construction materials and methods used for anchored systems. This book provides detailed information on design analyses for ground anchored systems. Topics discussed include selection of design earth pressures, ground anchor design, design of corrosion protection system for ground anchors, design of wall components to resist lateral and vertical loads, evaluation of overall anchored system stability, and seismic design of anchored systems. Also included in this book are two detailed design examples and technical specifications for ground anchors and for anchored walls.

This manual provides state-of-the-practice methods and techniques to assist the highway engineer in the planning, design, and construction monitoring of dynamic compaction to improve the load supporting capacity of weak foundation soils. Guidelines are presented for: completing a preliminary evaluation to determine if dynamic compaction is appropriate for the site and subsurface conditions detailed design for site improvement preparation of a specification construction monitoring Two case histories of actual projects are presented to demonstrate the use of the guidelines.

ntroduction to Highway Hydraulics provides an introduction to highway hydraulics. Hydrologic techniques presented concentrate on methods suitable to small areas, since many components of highway drainage (culverts, storm drains, ditches, etc) service primarily small areas. A brief review of fundamental hydraulic concepts is provided, including continuity, energy, momentum, hydrostatics, weir flow and orifice flow. The book then presents open channel flow principles and design applications, followed by a parallel discussion of closed conduit principles and design applications. Open channel applications include discussion of stable channel design and pavement drainage. Closed conduit applications include culvert and storm drain design. Examples are provided to help illustrate important concepts. An overview of energy dissipators is provided and the document concludes with a brief discussion of construction, maintenance and economic issues. As the title suggests, Introduction to Highway Hydraulics provides only an introduction to the design of highway drainage facilities and should be particularly useful for designers and engineers without extensive drainage training or experience.

This edition of Hydraulic Engineering Circular No. 12 incorporates new design charts and procedures developed from laboratory tests of interception capacities and efficiencies of highway pavement drainage in- lets. A chart for the solution of the kinematic wave equation for overland flow and a new chart for the solution of Manning's equation for triangular channels are provided. Charts and procedures for using the charts are provided for 7 grate types, slotted drain inlets, curb- opening inlets, and combination inlets on grade and in sump locations. Charts, tables, and example problem solutions are included in the text where introduced and discussed. The text includes discussion of the effects of roadway geometry on pavement drainage; the philosophy of design frequency and design spread selection; storm runoff estimating methods; flow in gutters; pavement drainage inlets, factors affecting capacity and efficiency, and comparisons of interception capacity; median inlets; embankment inlets; and bridge deck inlets. Five appendixes are included with discussion of the development of rainfall intensity-duration-frequency curves and equations, mean velocity in a reach of triangular channel with unsteady flow, the development of gutter capacity curves for compound and parabolic roadway sections, and the development of design charts for grates of specific size and bar configuration.