Download or read book Repair Evaluation Maintenance and Rehabilitation Research Program Inspection and Control of Levee Underseepage During Flood Fights written by Robert W. Cunny and published by . This book was released on 1987 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was conducted in response to a problem definition workshop held in April 1984 for the Repair, Evaluation, Maintenance, and Rehabilitation (REMR) Research Program, Rehabilitation Alternatives to Control Adverse Effects of Levee Underseepage. The following research need was determined to have one of the highest priorities: Emergency flood flight guidance for observing underseepage and employing remedial actions. Documented in this report are the basic levee inspection responsibilities and flood fighting techniques of the Mississippi River Valley Districts (Rock Island, St. Louis, Memphis, and Vicksburg) and the Levee Boards. The need for a consistent terminology for the severity of underseepage, better flood fight training for young engineers, and better mobility for inspection were the main problems identified in this report. The following terminology is recommended as a standard to describe the severity of underseepage: Light - area is wet; Moderate - running water is observed; Heavy - pin boils (small pipe openings without sand cones) with running water; Sand boils - any pipe opening with sand cones; Large boils - sand boils with pipe openings 12 inches or more in diameter (size described by diameter of pipe opening).
Download or read book Inspection and Control of Levee Underseepage During Flood Fights written by Robert W. Cunny and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1988-04 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Repair Evaluation Maintenance and Rehabilitation Research Program Levee Underseepage Software User Manual and Validation written by Robert W. Cunny and published by . This book was released on 1989 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: A FORTRAN 77 computer program (LEVSEEP) was developed to analyze levee underseepage on IBM PC compatible microcomputers with an 8087 math coprocessor. The software and associated equipment plots cross sections and piezometer data; calculates seepage flow and substratum pressure; analyzes landside berm, river side blanket, cutoff and relief well control measures; and finally, estimates the construction cost o these alternatives. The results of example computer calculations agree favorably with hand solutions. The procedures for berm and relief well analysis reflect the current CE guidance in EM 1110-2-1913. The method of fragments is used for the analysis of cutoff. Riverside blanket analysis are based on procedures presented in the WES Technical Memorandum 3-424. The products are recommended for practical use by Corp's Districts having problems with flood control levees. (KR).
Download or read book Repair Evaluation Maintenance and Rehabilitation Research Program Levee Underseepage Analysis for Special Foundation Conditions written by and published by . This book was released on 1989 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes a research study in which techniques were developed for prediction of underseepage conditions for special cases of levee and foundation geometry. The differential equations for levee underseepage were derived and programmed in finite difference form for three special cases of boundary conditions. The developed programs allow analyses that are not restricted to the boundary conditions assumed in the conventional, closed form solution, i.e., two foundation layers of uniform thickness with horizontal boundaries. The three special cases of foundation conditions that can be analyzed are as follow: a) Foundations consisting of three layers of uniform thickness with horizontal boundaries and differing horizontal and vertical permeability in each layer. b) Foundations consisting of two layers of nonuniform thickness with irregular boundaries, and c) Levee reaches where the levee alignment bends or forms a corner. Capabilities of the techniques and programs are demonstrated by comparing theoretical solutions to observed performance at eight field locations where piezometric data are available. At each location, the field permeability ratio was estimated by varying program input and seeking a match between the program output and actual observed performance.
Download or read book Report of Sixteenth Interagency Research Coordination Conference written by and published by . This book was released on 1989 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book List of Publications of the U S Army Engineer Waterways Experiment Station written by U.S. Army Engineer Waterways Experiment Station and published by . This book was released on 1993 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Repair Evaluation Maintenance and Rehabilitation Research Program The Effects of Vegetation on These Structural Integrity of Sandy Levees written by and published by . This book was released on 1991 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to investigate the relationship between vegetation and the structural integrity of river levees. A specific objective was to determine the distribution of roots within levee embankments, and how these roots alter properties of levee embankments and affect their resistance to mass wasting, surficial erosion, piping, etc. With this information, engineering criteria can be developed in the future that may allow additional vegetation to remain on levee embankments where sufficient effort can be made for levee inspection. Current Corps of Engineers guidelines for levee maintenance and operation limit vegetation on the embankment to sod-forming grasses 2 to 12 in. in height to provide for structural integrity, visual inspection, and unhindered flood fight access to levees. Root concentrations and distributions were determined using the profile-wall method in which root cross sections were exposed in the vertical wall of an excavated trench. Transects were excavated running both parallel and perpendicular to the crest of the levee through areas dominated by different woody plant species typical of riparian vegetation. Plant roots reinforce the levee soil and increase shear strength in a measureable manner. A shear strength increase or root cohesion can be estimated from the root biomass per unit volume or alternatively from the root area ratio.
Download or read book Levees and the National Flood Insurance Program written by Committee on Levees and the National Flood Insurance Program Improving Policies and Practices and published by National Academies Press. This book was released on 2013-08-01 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Federal Emergency Management Agency's (FEMA) Federal Insurance and Mitigation Administration (FIMA) manages the National Flood Insurance Program (NFIP), which is a cornerstone in the U.S. strategy to assist communities to prepare for, mitigate against, and recover from flood disasters. The NFIP was established by Congress with passage of the National Flood Insurance Act in 1968, to help reduce future flood damages through NFIP community floodplain regulation that would control development in flood hazard areas, provide insurance for a premium to property owners, and reduce federal expenditures for disaster assistance. The flood insurance is available only to owners of insurable property located in communities that participate in the NFIP. Currently, the program has 5,555,915 million policies in 21,881 communities3 across the United States. The NFIP defines the one percent annual chance flood (100-year or base flood) floodplain as a Special Flood Hazard Area (SFHA). The SFHA is delineated on FEMA's Flood Insurance Rate Maps (FIRM's) using topographic, meteorologic, hydrologic, and hydraulic information. Property owners with a federally back mortgage within the SFHAs are required to purchase and retain flood insurance, called the mandatory flood insurance purchase requirement (MPR). Levees and floodwalls, hereafter referred to as levees, have been part of flood management in the United States since the late 1700's because they are relatively easy to build and a reasonable infrastructure investment. A levee is a man-made structure, usually an earthen embankment, designed and constructed in accordance with sound engineering practices to contain, control, or divert the flow of water so as to provide protection from temporary flooding. A levee system is a flood protection system which consists of a levee, or levees, and associated structures, such as closure and drainage devices, which are constructed and operated in accordance with sound engineering practices. Recognizing the need for improving the NFIP's treatment of levees, FEMA officials approached the National Research Council's (NRC) Water Science and Technology Board (WSTB) and requested this study. The NRC responded by forming the ad hoc Committee on Levee and the National Flood Insurance Program: Improving Policies and Practices, charged to examine current FEMA treatment of levees within the NFIP and provide advice on how those levee-elated policies and activities could be improved. The study addressed four broad areas, risk analysis, flood insurance, risk reduction, and risk communication, regarding how levees are considered in the NFIP. Specific issues within these areas include current risk analysis and mapping procedures behind accredited and non-accredited levees, flood insurance pricing and the mandatory flood insurance purchase requirement, mitigation options to reduce risk for communities with levees, flood risk communication efforts, and the concept of shared responsibility. The principal conclusions and recommendations are highlighted in this report.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1988 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Midwest Flood written by United States. General Accounting Office and published by . This book was released on 1995 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Locally Operated Levees Issues and Federal Programs written by and published by DIANE Publishing. This book was released on with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1988 with total page 1084 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Repair Evaluation Maintenance and Rehabilitation Research Program Workshop on Levee Rehabilitation Held at Vicksburg Mississippi on 17 March 1992 written by and published by . This book was released on 1994 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented are the proceedings of the REMR Workshop on Levee Rehabilitation. The workshop was conducted to stimulate exchange of ideas and information regarding innovative methods for levee rehabilitation, directions for analytical and laboratory research, and possible field demonstrations of innovative methods. Presentations are made on seismic damage to levees, lime stabilization of levee slides, use of geogrids for levee slope repair, use of rockfill trenches to stabilize levees, use of geotextiles for levee construction on soft soils, and soil nailing for slope repair. A copy of available written lectures is included in these proceedings.
Download or read book Performance of Levee Underseepage Controls A Critical Review written by and published by . This book was released on 2002 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Federal Government through the U.S. Army Corps of Engineers (USACE) has a large investment in flood-control levees. Where such levees are built on pervious foundations, seepage beneath the levee (underseepage) during floods can produce pressure and flow conditions capable of initiating subsurface erosion leading to levee failure. Two adverse phenomena may occur; one is sand boils which involves the movement of subsurface sand to the surface by flowing water, and the other is heaving which involves the upward movement of a relatively impervious surface layer resulting from subsurface water pressures in excess of its weight. To prevent such occurrences, the USACE has developed a set of procedures to analyze underseepage conditions on a site-specific basis and a set of procedures to design underseepage control measures. For the most part, these procedures were developed in the 194Os and 1950s. Intensive construction of control measures was accomplished in the 195Os and l96Os. Several moderately large and major floods have provided data from which the validity of the procedures and the security of the constructed system can be inferred. Also, since the 195Os many technical advancements have been made in engineering analysis techniques and construction methods that may merit application to underseepage problems.
Download or read book Preservation of Ageing Marine Structures written by University of California (System). Sea Grant College Program and published by . This book was released on 1990 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book LEVSEEP Analysis Software for Levee Underseepage and Rehabilitation written by and published by . This book was released on 1995 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: The computer program LEVSEEP version 3.0 is presented for use in the analysis of levee underseepage. This version of the program includes a two-layer analysis model for levees with a top blanket over a pervious foundation. The software calculates seepage flow and substratum pressure for either physical and geometric properties (initial conditions) or field piezowmeter readings; analyzes the effects of various control measures (namely, landside berms, riverside blankets, cutoffs, and relief wells); plots cross sections, piezometer data, and control measures; provides quantity and cost estimates of each of these control measure alternatives; and gives a complete summary of all calculations. The procedures for berm analysis employed within LEVSEEP reflect the current Corps guidance discussed in EM 1110-2-1913 (Headquarters, Department of the Army 1978). The procedures for riverside blanket analysis are as presented in TM 3A24 (U.S. Army Engineer Waterways Experiment Station 1956). Procedures for analysis of cutoffs are based on the method of fragments as presented by Harr (1962). The procedures for relief well system analysis reflect Corps guidance as presented in EM 1110-2-1913. Specific equations and procedures used for well analysis were taken from TM 3A24 and Engineer Bulletin 55-11 (Headquarters, Department of the Army 1955). The well procedure is for infinite, partially penetrating, or fully penetrating well systems under artesian flow; it does not apply to finite length systems or pumped systems. Example problems and case studies are presented LEVSEEP provides a convenient analysis tool that should allow designers to approximately model actual field conditions. However, flood protection is a complex system involving design, construction, maintenance, and performance evaluation of levees.
