Unified Interior Regions

Region 4: Mississippi Basin

Regions L2 Landing Page Tabs

Filter Total Items: 4,185
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Year Published: 1966

Little Sioux River Basin floods

Highway engineers and many others use flood stages and discharges in the design of bridges and other structures or operations on the flood plain of a stream. These data are provided in the form of gaging-station and other flood records and as flood profiles. Flood-frequency data are used to compute the 25- and 50-year recurrence interval...

Schwob, Harlan H.
Little Sioux River Basin floods; 1966; OFR; 67-196; Schwob, Harlan H.

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Year Published: 1966

Summer base-flow recession curves for Iowa streams

Base-flow recession. curves for the summer months (June through September) were developed in this study for gaging stations on interior Iowa streams having five or more years of record. The tabulated data enables the user, starting with a known base flow at a gage, to estimate base flows for up to 20 days in the future. Rainfall during the period...

Saboe, C.W.
Summer base-flow recession curves for Iowa streams; 1966; OFR; 66-120; Saboe, C. W.

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Year Published: 1966

Water-surface profiles of Raccoon River at Des Moines, Iowa

This investigation was undertaken as a part of the cooperative program with the Iowa Institute of Hydraulic Research, the City of Des Moines, and the U.S. Geological Survey.  The purpose of this report is twofold: 1.  To present water-surface profiles and rating curves for existing channel conditions in the 4-mile reach of Raccoon River...

Carpenter, Philip J.; Appel, David H.
Water-surface profiles of Raccoon River at Des Moines, Iowa; 1967; OFR; 67-37; Carpenter, P. J.; Appel, D. H.

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Year Published: 1966

Magnitude and frequency of Iowa floods, Part One

No abstract available.

Schwob, Harlan H.

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Year Published: 1966

Magnitude and frequency of Iowa floods, Part two

Floqd records fo.r regular and partial-record gaging stations are contained in the following pages. Each listing contains the station number .and name, descriptive paragraphs pertaining to the station, qnd a listing of the flood peaks available through the 1965 water year. Peaks above a base as well as annual peaks are listed. These provide...

Schwob, Harlan H.

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Year Published: 1966

Contamination of the freshwater ecosystem by pesticides

A large part of our disquieting present-day pesticide problem is intimately tied to the freshwater ecosystem. Economic poisons are used in so many types of terrain to control so many kinds of organisms that almost all lakes and streams are likely to be contaminated. In addition to accidental contamination many pesticides are deliberately applied...

Cope, Oliver B.

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Year Published: 1966

Dechlorination of DDT by Aerobacter aerogenes

Dechlorination of DDT to DDD in higher animals requires the presence of molecular oxygen, but in microorganisms the presence of oxygen hinders dechlorination. In cell-free preparations of Aerobacter aerogenes, the use of selected metabolic inhibitors indicated that reduced Fe(II) cytochrome oxidase was responsible for DDT dechlorination. This...

Wedemeyer, Gary

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Year Published: 1966

Persistence of 2,6-Dichlorobenzonitrile in aquatic environments

In two experiments 2,6-dichlorobenzonitrile was added to aquatic systems, and the residue levels were followed for about 6 months. A granular formulation applied to a farm pond at 0.6 p.p.m. produced highest residues in water and fish about 2 weeks following treatment whereas vegetation and soil samples had the highest levels within 1 or 2 days....

Van Valin, C.C.

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Year Published: 1966

Some effects of Heptachlor on bluegills (Lepomis macrochirus)

In complementary studies of the chronic effects of heptachlor on bluegills, four similar earthen ponds were treated once with different concentrations of heptachlor, and the fish in six plastic pools were routinely fed different levels of heptachlor. A fifth pond and two plastic pools were used as controls. Higher dosages resulted in higher...

Andrews, Austin K.; Stebbings, Bruce E.; Van Valin, Charles C.

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Year Published: 1966

Toxicities of several pesticides to two species of Cladocerans

Laboratory bioassays were conducted with some chlorinated hydrocarbon insecticides, organophosphate insecticides, other insecticides and acaricides, and with herbicides to determine their relative toxicities and immobilization values for two species of daphnids, Daphnia pulex and Simocephalus serrulatus. Both species are satisfactory bioassay...

Sanders, Herman O.; Cope, Oliver B.