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This HEC 1 document, "Selected Bibliography of Hydraulic and Hydraulic Subjects", FHWA EPD-86-104 is a bibliography compiled to assist highway engineers in securing current and authoritative publications on hydraulic and hydrologic subjects. File Size: 148187 bytes
There are many types of split flow situations that can occur in a river. The following is a list of the more commonly encountered split flow situations:
Split flows caused by islands or high ground dividing the flow.
Split flows caused by levee overtopping.
Split flows caused by watershed divide overtopping.
Split flows caused by diversion structures. The HEC-2 split flow option is capable of analyzing all of the above split flow situations except for bifurcation of flow at islands or high ground. In addition, HEC-RAS cannot model any of the above split flow situations.
This document describes how to model the bifurcation of flow at an island using HEC-2 (or HEC-RAS) and a graphical interpolation method. This interpolation method can be used whenever flow is separated into two or more channels. For example, this method can be used to model divided flow when there are multiple bridge openings at a roadway crossing (when the conveyance is separated among the bridge openings).
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This is the HEC 5 document, "Hydraulic Charts for the Selection of Highway Culverts", FHWA EPD-86-105. Designing highway culverts involves many factors including estimating flood peaks, hydraulic performance, structural adequacy, and overall construction and maintenance costs. This circular contains a brief discussion of the hydraulics of conventional culverts and charts for selecting a culvert size for a given set of conditions, as well as instructions for using the charts. File Size: 2543253 bytes
This document contains the complete HEC-6 documentation. HEC-6 is a one-dimensional sediment transport model, and can calculate water surface and sediment bed surface profiles in the stream bed and the flowing water-sediment mixture. File Size: 1349943 bytes
This document contains the guidelines for the calibration and application of HEC-6. This is a supplement to the HEC-6 User Manual. This document has substantial new material since the publication of the HEC-6 User Manual. File Size: 2141331 bytes
This PDF technical document, "Debris Control Structures", FHWA EPD-86-106, discusses water-borne debris problems and structures used for controlling debris. An accumulation of debris at inlets of highway drainage structures is a frequent cause of unsatisfactory performance or malfunction. This accumulation may result in failure of the drainage structure, or overtopping of the roadway by flood water, or possible damage to the roadway and other property. Consideration of the need for debris-control structures should be an essential part of all hydraulic structure designs. This PDF technical document emphasizes on culverts because their relatively limited waterway area is subject to clogging by retention of debris at the inlet. In this PDF technical document a system of classifying the type of debris expected from any drainage basin is followed by a list of types of debris-control structures. The basis for choosing the type of control structure is given and details of design are discussed.
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This is the HEC 10 document "Capacity Charts for the Hydraulic Design of Highway Culverts", FHWA EPD-86-105, November 1972. Since hydraulic capacity is one of the most important factors in the design of a highway culvert, simple methods for making this determination are needed. This circular contains a series of hydraulic capacity charts which permit the direct selection of a culvert size for a particular site without making detailed computations. File Size: 3713101 bytes
This is the HEC 11 document entitled "Design of Riprap Revetment", Metric Version, FHWA IF-00-022. It includes discussions on recognizing erosion potential, erosion mechanisms, riprap failure modes and riprap types. Design concepts included are: design discharge, flow types, channel geometry, flow resistance, extent of protection, and toe depth. Detailed design guidelines are presented for rock riprap, and design procedures are summarized in charts and examples. Design guidance is also presented for wire-enclosed rock, precast concrete blocks, and concrete paved linings. File Size: 13537313 bytes
This is the HEC 11 document entitled "Design of Riprap Revetment", March 1989, FHWA IP-89-016. File Size: 5058591 bytes
This is the HEC 12 document entitled "Drainage of Highway Pavements", FHWA TS-84-202, March 1984. This circular considers the removal of storm water from highway pavement surfaces and median areas. It discusses roadway geometry as it affects pavement drainage, estimation of storm water runoff for inlet design, and flow in curbed gutter sections. It also includes a discussion of types of inlets, factors affecting inlet interception capacity, inlet interception capacity comparisons and design charts. It also discusses median, embankment and bridge inlets, procedures for developing design charts for parabolic roadway sections and for standard inlet configurations and cross slopes. File Size: 3395858 bytes
This is the HEC 13 document entitled "Hydraulic Design of Improved Inlets for Culverts", FHWA EPD-86-109, August 1972. This document gives a short review of conventional culvert hydraulics, discusses types of improved inlets, and presents design procedures for box and pipe culverts with improved entrances. File Size: 6719618 bytes
This is the HEC 14 document entitled "Hydraulic Design of Energy Dissipators for Culverts and Channels", September 1983, Metric Version. It provides design information for analyzing dissipation problems at culvert outlets and in open channels. Design chapters cover the general types of dissipaters: Hydraulic Jump, forced hydraulic jump, impact, drop structure, and riprap. File Size: 25954465 bytes
This is the HEC 14 document entitled "Hydraulic Design of Energy Dissipators for Culverts and Channels", September 1983, FHWA EPD-86-110. File Size: 2933014 bytes
This is the HEC 15 document entitled "Design of Roadside Channels with Flexible Linings", April 1988, Metric Version. It provides design procedures for several types of flexible linings. Special design procedures are presented for composite channels and channels with steep gradients. The design procedures are based on the concept of maximum permissible tractive force. Methods for determination of hydraulic resistance and permissible shear stress for individual linings are presented. Nomographs are provided for solution of uniform flow conditions in trapezoidal channels and determination of resistance characteristics for vegetation and permissible shear stress for soils. File Size: 8403407 bytes
This is the HEC 15 document entitled "Design of Roadside Channels with Flexible Linings", April 1988, FHWA IP-87-7. File Size: 1160415 bytes
This is the HEC 16 document entitled "Addendum to Highways in the River Environment/Hydraulic and Environmental Design Considerations", FHWA EPD-86-116, July 1980. File Size: 3702281 bytes
This is the HEC 17 document entitled "The Design of Encroachments on Flood Plains using Risk Analysis", April 1981, FHWA EPD-86-112. The purpose of this manual is to provide guidance in the application of the least total expected cost (LTEC) design decision-making process in the design of flood plain encroachments. File Size: 26788280 bytes
This HEC 18 document is entitled "Evaluating Scour at Bridges", FHWA NHI 01-001, May 2001, Fourth Edition. This document is provided by the Federal Highway Administration (FHWA) to provide guidance in:
Designing new and replacement bridges to resist scour.
Evaluating existing bridges for vulnerability to scour.
Inspecting bridges for scour.
Providing scour counter-measures.
Improving the state-of-practice of estimating scour at bridges. File Size: 3802055 bytes
This HEC 18 document is "Evaluating Scour at Bridges", FHWA IP-90-017, November 1995, Third Edition, Metric Version. File Size: 5190334 bytes
This HEC 18 document is "Evaluating Scour at Bridges", FHWA IP-90-017, November 1995, Third Edition. File Size: 5231735 bytes
This is the HEC 18 document, "Evaluating Scour at Bridges", FHWA IP-90-017, February 1993. File Size: 7731779 bytes
This HEC 19 document is entitled "Hydrology", FHWA IP-84-15, October 1984. By application of the principles and methods of modern hydrology, it is possible to obtain solutions which are functionally acceptable and form the basis for the design of highway drainage structures. This manual presents some of these principles and techniques and explains their uses by illustrative examples. It also discusses basic hydrologic concepts and hydrologic analysis as it relates to the highway stream crossing problem. File Size: 42831075 bytes
This is the HEC 20 document entitled "Stream Stability at Highway Structures", Third Edition, FHWA NHI 01-002. 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 flood damages to bridges and other highway components at stream crossings. File Size: 3267610 bytes
This is the HEC 20 document entitled "Stream Stability at Highway Structures", Second Edition, FHWA HI-96-032, November 1995. File Size: 2996626 bytes
This is the HEC 20 document entitled "Stream Stability at Highway Structures", FHWA IP-90-014, February 1991. File Size: 2303211 bytes
This is the HEC 21 document entitled "Bridge Deck Drainage Systems", May 1993, FHWA SA-92-010. The objective of this manual is to support sound, economic, and low maintenance design for bridge deck and bridge end drainage facilities. The manual provides guidelines and procedures for designing bridge deck drainage systems, accompanied with illustrative and practical examples. File Size: 5868533 bytes
This is the HEC 22 manual entitled, "Urban Drainage Design Manual", FHWA NHI-01-021, August 2001. It provides a comprehensive and practical guide for the design of storm drainage systems associated with transportation facilities. Design guidance is provided for the design of storm drainage systems which collect, convey, and discharge stormwater flowing within and along the highway right-or-way. Methods and procedures are given for the hydraulic design of storm drainage systems. Design methods are presented for evaluating rainfall and runoff magnitude, pavement drainage, gutter flow, inlet design, median and roadside ditch flow, structure design, and storm drain piping. Procedures for the design of retention facilities and stormwater pump stations are also presented, along with a review of urban water quality practices. A summary of related public domain computer programs is also provided. File Size: 9079219 bytes
This is the HEC 22 manual entitled, "Urban Drainage Design Manual", FHWA SA-96-078, November 1996, Metric Version. File Size: 10653450 bytes
This is the HEC 22 manual entitled, "Urban Drainage Design Manual", FHWA SA-96-078, November 1996. File Size: 71356307 bytes
This is the HEC 23 document entitled "Bridge Scour and Stream Instability Counter-measures Experience, Selection, and Design Guidance", Second Edition, FHWA NHI 01-003, March 2001. This document identifies bridge scour and stream instability countermeasures that have been instrumented by various SHAs to protect bridges in the United States. It develops a matrix which summarizes countermeasure application and use through the United States and provides design guidelines for several countermeasures which have been applied successfully on a state or regional basis, but for which only limited design references are available. File Size: 2946998 bytes
This is the HEC 23 document entitled "Bridge Scour and Stream Instability Counter-measures", FHWA HI-97-030, July 1997. 
