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Ground-water data for Michigan, 1980
G.C. Huffman
1981, Open-File Report 81-811
The purpose of this report is to make available the 1980 records of water levels and related data for the principal aquifers of the State. This report is written for municipalities, industries, institutions, consultants, drillers, hydrologists and other people interested in the ground-water resources....
Low-flow frequency data for selected stream gaging stations in Florida
G.H. Hughes
1981, Open-File Report 81-69
This report contains tables of low-flow frequency data for 161 stream-gaging stations in Florida. The selected stations represent those having suitable flow records spanning 7 or more years. Flow values representing the annual minimum average flow for selected periods ranging from 1 to 183 days are presented for recurrence intervals...
Hydrogeology of well-field areas near Tampa, Florida; Phase I, development and documentation of a two-dimensional finite-difference model for simulation of steady-state ground-water flow
C. B. Hutchinson, Dale M. Johnson, James M. Gerhart
1981, Open-File Report 81-630
A two-dimensional finite-difference model was developed for simulation of steady-state ground-water flow in the Floridan aquifer throughout a 932-square-mile area, which contains nine municipal well fields. The overlying surficial aquifer contains a constant-head water table and is coupled to the Floridan aquifer by a leakage term that represents flow through...
Aquatic biology of the Redwood Creek and Mill Creek drainage basins, Redwood National Park, Humboldt and Del Norte counties, California
Rick T. Iwatsubo, R. C. Averett
1981, Open-File Report 81-143
A 2-year study of the aquatic biota in the Redwood Creek and Mill Creek drainage basins of Redwood National Park indicated that the aquatic productivity is low. Densities of coliform bacteria were low except in Prairie Creek, a tributary to Redwood Creek, where a State park, county fish hatchery, grazing...
Pattern-recognition program modified and applied to southeastern United States seismicity
Meridee Jones-Cecil, Russell L. Wheeler, James W. Dewey
1981, Open-File Report 81-195
The pattern-recognition technique of Bongard and others (1966), Gelfand and others (1976), and Briggs and others (1977) was modified and applied in Southeastern United States to try to detect combinations or interactions of geologic, geophysical, and topographic parameters characteristic of areas with moderate and large earthquakes. The modification involved replacing...
Peak horizontal acceleration and velocity from strong motion records including records from the 1979 Imperial Valley, California, earthquake
William B. Joyner, David M. Boore, Ronald L. Porcella
1981, Open-File Report 81-365
We have taken advantage of the recent increase in strong-motion data at close distances to derive new attenuation relations for peak horizontal acceleration and velocity. Acceleration data from 183 recordings of 24 earthquakes and velocity data from 62 recordings of 10 earthquakes have been used. This new analysis uses a...
Quality of water and time of travel in Goodwater and Okatoma Creeks near Magee, Mississippi
Stephen J. Kalkhoff
1981, Open-File Report 81-1012
An intensive quality-of-water study was conducted during a period of generally low streamflow in Goodwater and Okatoma Creeks near Magee, Miss. During the August 12-14, 1980, study, the mean specific conductance of the water at all sites was less than 59 micromhos per centimeter; the dissolved-oxygen concentrations were greater than...