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A statistical analysis of the quality of surface water in Nebraska
R. A. Engberg
1980, Water-Resources Investigations Report 80-43
This report provides descriptive statistics for 29 chemical or biological constituents for 109 stream sites in Nebraska sampled by the U.S. Geological Survey beginning in 1946. Also provided for each site are regression equations relating specific conductance to each of 12 chemical constituents and a regression equation relating specific conductance...
Interactive computer methods for generating mineral-resource maps
James Alfred Calkins, A.S. Crosby, T.E. Huffman, A. L. Clark, G.T. Mason, R.J. Bascle
1980, Circular 815
Inasmuch as maps are a basic tool of geologists, the U.S. Geological Survey's CRIB (Computerized Resources Information Bank) was constructed so that the data it contains can be used to generate mineral-resource maps. However, by the standard methods used-batch processing and off-line plotting-the production of a finished map commonly takes...
Petroleum-resource appraisal and discovery rate forecasting in partially explored regions
Lawrence J. Drew, J.H. Schuenemeyer, David H. Root, E. D. Attanasi
1980, Professional Paper 1138-A-C
PART A: A model of the discovery process can be used to predict the size distribution of future petroleum discoveries in partially explored basins. The parameters of the model are estimated directly from the historical drilling record, rather than being determined by assumptions or analogies. The model is based on...
Waste-assimilation capacity of the Arkansas River in Pueblo County, Colorado, as it relates to water-quality guidelines and stream classification
Doug Cain, Duaina Baldridge, Patrick Edelmann
1980, Water-Resources Investigations Report 80-82
The waste-assimilation capacity of a 42-mile reach of the Arkansas River in Pueblo County, Colo., was evaluated using a one-dimensional steady-state water-quality model. The model was calibrated and verified using hydraulic and water-quality data collected in 1976 and 1979. The water-quality con-stituents modeled were 5-day carbonaceous biochemical oxygen demand, total...
The Boulder Creek Batholith, Front Range, Colorado
Dolores J. Gable
1980, Professional Paper 1101
The Boulder Creek batholith is the best known of several large Precambrian batholiths of similar rock composition that crop out across central Colorado. The rocks in the batholith belong to the calc-alkaline series and range in composition from granodiorite through quartz diorite (tonalite) to gneissic aplite. Two rock types dominate':...