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Search indexed USGS publications on groundwater, aquifers, geologic maps, mineral resources and earthquakes. Explore source records by subject and place.

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At least 1,117 records · Page 62Linked to original sources
USGS2017

Bridge scour countermeasure assessments at select bridges in the United States, 2014–16

In 2009, the Federal Highway Administration published Hydraulic Engineering Circular No. 23 (HEC-23) to provide specific design and implementation guidelines for bridge scour and stream instability countermeasures. However, the effectiveness of countermeasures implemented over the past decade following those guidelines has not been evaluated. Therefore, in 2013, the U.S. Geological Survey, in cooperation with the Federal Highway Administration, began a study to assess the current condition of bridge-scour countermeasures at selected sites to evaluate their effectiveness. Bridge-scour countermeasures were assessed during 2014-2016. Site assessments included reviewing countermeasure design plans, summarizing the peak and daily streamflow history, and assessments at each site. Each site survey included a photo log summary, field form, and topographic and bathymetric geospatial data and metadata. This report documents the study area and site-selection criteria, explains the survey methods used to evaluate the condition of countermeasures, and presents the complete documentation for each countermeasure assessment.

Florida, Illinois, Missouri, Montana↗
USGS2019

Bridge scour countermeasure assessments at select bridges in the United States, 2016–18

In 2009, the Federal Highway Administration published Hydraulic Engineering Circular No. 23 (HEC-23) to provide specific design and implementation guidelines for bridge scour and stream instability countermeasures. However, the effectiveness of countermeasures implemented over the past decade following those guidelines has not been evaluated. Therefore, in 2013, the U.S. Geological Survey, in cooperation with the Federal Highway Administration, began a study to assess the current condition of bridge-scour countermeasures at selected sites to evaluate their effectiveness. Bridge-scour countermeasures were assessed during 2016–2018 after additional sites were added following a similar study. Site assessments included reviewing countermeasure design plans, summarizing the peak and daily streamflow history, and assessments at each site. Each site survey included a photo log summary, field form, and topographic and bathymetric geospatial data and metadata. This report documents the study area and site-selection criteria, explains the survey methods used to evaluate the condition of countermeasures, and presents the complete documentation for each countermeasure assessment.

Connecticut, Idaho, Iowa, Missouri, Montana, New J↗
USGS1982

Methods for the determination of organic substances in water and fluvial sediments, USGS TWRI, Book 5, Laboratory analysis, Chapter A3

This manual contains analytical methods used by the U.S. Geological Survey for the determination of organic substances in water, water-suspended sediment mixtures, and bottom material. Some of the analytical procedures yield determinations for specific compounds, whereas others provide a measure of the quantity of groups of compounds present in the sample. Examples of the first category are procedures for the organochlorine and organophosphate insecticides, chlorophenoxy acid and triazine herbicides and specific substituted phenols. Examples of the second category are the various organic carbon analyses and the polychlorinated biphenyl methods. Each analytical method is presented in a standardized format which includes conditions for application of the method, a summary of the method, interferences, required apparatus and reagents, analytical procedures, calculations, reporting of results, and estimation of precision.

Open-File Report↗
USGS1985

Proceedings of the advanced seminar on sedimentation, August 15-19, 1983, Denver, Colorado

On August 15-19, 1983, the U.S. Geological Survey 's Water Resources Division sponsored an advanced seminar on sedimentation at the National Training Center in Lakewood, Colorado. Topics discussed were modeling, mud, and debris flows, transport, sediment chemistry, channel morphology, instrumentation, and bed load. This circular presents summaries of 28 presentations. (USGS)

Open-File Report↗
USGS1968

Geological Survey research 1968, Chapter B

This collection of 44 short papers is the first published chapter of "Geological Survey Research 1968." The papers report on scientific and economic results of current work by 1ne1nbers of the Geologic, Topographic, and Water Resources Divisions of the U.S. Geological Survey. Chapter A, to be published later in the year, will present a summary of significant results of work done during fiscal year 1968, together with lists of investigations in progress, reports published, cooperating agencies, and Geological Survey offices.

Professional Paper↗
USGS1969

Geological Survey research 1969, Chapter B

This collection of 40 short papers is the first published chapter of "Geological Survey Research 1969." The papers report on scientific and economic results of current work by members of the Conservation, Geologic, and Water Resources Divisions of the U.S. Geological Survey. Chapter A, to be published later in the year, will present a summary of significant results of work done during fiscal year 1969, together with lists of investigations in progress, reports published, cooperating agencies, and Geological Survey offices.

Professional Paper↗
USGS1969

Geological Survey research 1969, Chapter C

This collection of 38 short papers is the second published chapter of "Geological Survey Research 1969." The papers report on scientific and economic results of current work by members of the Geologic, Topographic, and Water Resources Divisions of the U.S. Geological Survey. Chapter A, to be published later in the year, will present a summary of significant results of work done during fiscal year 1969, together with lists of investigations in progress, reports published, cooperating agencies, and Geological Survey offices.

Professional Paper↗
USGS1969

Geological Survey research 1969, Chapter D

This collection of 45 short papers is the third published chapter of "Geological Survey Research 1969." The papers report on scientific and economic results of current work by members of the Geologic, Topographic, and Water Resources Divisions of the U.S. Geological Survey. Chapter A, to be published later in the year, will present a summary of significant results of work done during fiscal year 1969, together with lists of investigations in progress, reports published, cooperating agencies, and Geological Survey offices.

Professional Paper↗
USGS1987

Methods for the determination of organic substances in water and fluvial sediments

This manual describes analytical methods used by the U.S. Geological Survey to determine organic substances in water, water-suspended-sediment mixtures, and bottom material. Some of the analytical procedures yield determinations for specific com-pounds, whereas others provide a measure of the quantity of groups of compounds present in the sample. Examples of the first category are procedures for the organochlorine and organophosphate insecticides, chlorophenoxy acid and triazine herbicides, and specific substituted phenols. Examples of the second category are the various organic carbon analyses and the polychlorinated biphenyl methods. The analytical methods are presented in a standard format; topics covered include conditions for application of the method, a summary of the method, interferences, required apparatus and reagents, analytical procedures, calculations, reporting of results, and estimation of precision.

Techniques of Water-Resources Investigations↗