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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 1,747 records · Page 97Linked to original sources
USGS2001

Summary of water-quality data, October 1987 through September 1997, for Fountain and Monument Creeks, El Paso and Pueblo Counties, Colorado

Fountain and Monument Creeks, which drain parts of El Paso and Pueblo Counties in Colorado, have been sampled systematically by the U.S. Geological Survey for many years to obtain records of water-quality properties and constituents; the data are stored in the National Water Inventory System. Statistical summaries of these data indicate that they have spatial and temporal trends. Comparison of water-quality data to in-stream regulatory standards, some of which were calculated in this report, indicate that some exceedances are widespread in the system and that some occur locally. Nonparametric tests to quantitatively detect monotonic trends in water-quality data indicate that many water-quality properties and constituents do not have significant monotonic trends; detected trends were mostly downward.

Water-Resources Investigations Report↗
USGS1989

Ground-water levels in the alluvial aquifer at Louisville, Kentucky, 1987-88

Water-level data have been collected in the alluvial aquifer at Louisville, Kentucky by the U.S. Geological Survey since 1943. Summaries and analysis of these data are published periodically to update the record and to help public officials who must manage this groundwater supply. Maps and hydrographs are presented in this report to update the record for 1987-88 and to interpret recent trends in water levels. The data show that groundwater levels were stable for the period 1980-86 after rising rapidly in the 1970's. There has been a slight decline in the water levels during 1987-88 because of below normal precipitation for the period 1985-88. The decline has been about 1 to 3 ft in wells along the Ohio River and about 3 to 6 ft in wells away from the influence of the river. Groundwater withdrawals have also caused slight declines in the water table in three areas in Louisville. Declines in downtown Louisville due to pumpage seem to be stabilizing at or slightly below the normal pool stage of the Ohio River which indicates that water is probably being induced from the river into the aquifer. (USGS)

Water-Resources Investigations Report↗
USGS1998

Exploration

This summary of international nonfuel mineral exploration activities for 1997 draws upon available data from literature, industry and US Geological Sulvey (USGS) specialists. Data on exploration budgets by region and commodity are reported, significant mineral discoveries and exploration target areas are identified and government programs affecting the mineral exploration industry are discussed. Inferences and observations on mineral industry direction are drawn from these data and discussions.

Mining Engineering↗
USGS1999

Exploration

This summary of international nonfuel mineral exploration activities for 1998 draws on available data from literature, industry and US Geological Survey (USGS) specialists. Data on exploration budgets by region and commodity are reported, significant mineral discoveries and exploration target areas are identified and government programs affecting the mineral exploration industry are discussed. Inferences and observations on mineral industry direction are drawn from these data and discussions.

Mining Engineering↗
USGS2009

Excel Spreadsheet Tools for Analyzing Groundwater Level Records and Displaying Information in ArcMap

When beginning hydrologic investigations, a first action is often to gather existing sources of well information, compile this information into a single dataset, and visualize this information in a geographic information system (GIS) environment. This report presents tools (macros) developed using Visual Basic for Applications (VBA) for Microsoft Excel 2007 to assist in these tasks. One tool combines multiple datasets into a single worksheet and formats the resulting data for use by the other tools. A second tool produces summary information about the dataset, such as a list of unique site identification numbers, the number of water-level observations for each, and a table of the number of sites with a listed number of water-level observations. A third tool creates subsets of the original dataset based on user-specified options and produces a worksheet with water-level information for each well in the subset, including the average and standard deviation of water-level observations and maximum decline and rise in water levels between any two observations, among other information. This water-level information worksheet can be imported directly into ESRI ArcMap as an 'XY Data' file, and each of the fields of summary well information can be used for custom display. A separate set of VBA tools distributed in an additional Excel workbook creates hydrograph charts of each of the wells in the data subset produced by the aforementioned tools and produces portable document format (PDF) versions of the hydrograph charts. These PDF hydrographs can be hyperlinked to well locations in ArcMap or other GIS applications.

Techniques and Methods↗