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A water-quality assessment of the Burnham Creek Watershed, Polk County, Minnesota
M.R. Have
1975, Open-File Report 75-647
A water-quality assessment of the Burnham Creek watershed, Polk County, Minn., was made in May 1975. Surface waters were calcium magnesium bicarbonate types with 0.11 mg/liter or less of nitrite plus nitrate nitrogen and 0.10 mg/liter or less of total phosphorous. Fecal coliform bacteria concentrations were between 3 and 720...
Analysis of operational plan for Lake Chippewa near Winter, Wisconsin
William R. Krug
1975, Open-File Report 75-487
Historical inflows into Lake Chippewa for 39 years of record were analyzed to determine the possibility of operating the flowage within a 2-foot (0.6-metre) range of stage while maintaining a minimum discharge of 57 cubic feet per second (1.6 cubic metres per second) and limiting the maximum discharge to 7,000...
Configuration of water table and distribution of downward leakage to the Prairie du Chien-Jordan Aquifer in the Minneapolis-Saint Paul metropolitan area, Minnesota
Dana C. Larson-Higdem, S. P. Larson, Ralph F. Norvitch
1975, Open-File Report 75-342
The configuration of the water table as plotted at a contour interval of 20 feet (6 metres) on quadrangle maps (scale 1:2,500) of the Minneapolis-Saint Paul metropolitan area. Control points used for mapping were water levels in wells, lakes and sloughs, and places where topographic contours cross perennial streams. A computer...
An appraisal of groundwater for irrigation in the Appleton area, west-central Minnesota
Steven J. Larson
1975, Open-File Report 75-32
Supplemental irrigation of well-drained sandy soils has prompted an evaluation of ground water in the Appleton area. Glacial drift aquifers are the largest source of ground water. The surficial outwash sand and gravel is the most readily available and a really extensive drift aquifer and underlies much of the sandy...
Stochastic analysis of particle movement over a dune bed
Baum K. Lee, Harvey E. Jobson
1975, Open-File Report 75-358
Stochastic models are available that can be used to predict the transport and dispersion of bed-material sediment particles in an alluvial channel. These models are based on the proposition that the movement of a single bed-material sediment particle consists of a series of steps of random length separated by rest...
Magnitude and frequency of floods in Washington
J. E. Cummans, Michael R. Collings, Edmund George Nasser
1975, Open-File Report 74-336
Relations are provided to estimate the magnitude and frequency of floods on Washington streams. Annual-peak-flow data from stream gaging stations on unregulated streams having 1 years or more of record were used to determine a log-Pearson Type III frequency curve for each station. Flood magnitudes having recurrence intervals of 2,...
Reconnaissance engineering geology of the Ketchikan area, Alaska, with emphasis on evaluation of earthquake and other geologic hazards
Richard W. Lemke
1975, Open-File Report 75-250
The Alaska earthquake of March 27, 1964, dramatically emphasized the need for engineering geologic studies of urban areas in seismically active regions. A reconnaissance study of the Ketchikan area in southeastern Alaska is part of a program to evaluate earthquake and other geologic hazards in most of the larger Alaska...