Unified Interior Regions

Region 4: Mississippi Basin

Regions L2 Landing Page Tabs

Filter Total Items: 4,599
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Year Published: 1968

The relative toxicities of several pesticides to naiads of three species of stoneflies

Static bioassays were conducted to determine the relative acute toxicities of some insecticides, herbicides, fungicides, a defoliant, and a molluscicide to the naiads of three species of stonef!y, Pteronarcys califomica, Pteronarcella badia, and Claassenia sabulosa. Toxic effects were measured by determination of median lethal concn (Lcoo) for 24...

Sanders, Herman O.; Cope, Oliver B.

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Year Published: 1967

Floods in Rock River basin, Iowa

No abstract available

Carpenter, P.J.
Floods in Rock River basin, Iowa; 1967; OFR; 67-36; Carpenter, P. J.

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Year Published: 1967

Floods on Otter Creek in Linn County, Iowa

No abstract available.

Schwob, H.H.
Floods on Otter Creek in Linn County, Iowa; 1967; OFR; 67-195; Schwob, H. H.

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Year Published: 1967

Availability of ground water in Decatur County, Iowa

Decatur County and several other counties in south-central Iowa comprise an area that has been chronically short of good-quality water.  Municipalities, industries and rural water users alike have been affected by the water shortage.  Municipalities have experienced serious problems in obtaining potable supplies adequate to keep pace...

Cagle, J.W.; Steinhilber, W.L.

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Year Published: 1967

Biodegradation of dichlorodiphenyltrichloroethane: intermediates in dichlorodiphenylacetic acid metabolism by aerobacter aerogenes

The final product of dichlorodiphenyltrichloroethane (DDT) degradation by vertebrates is commonly considered to be dichlorodiphenylacetic acid, DDA. Recently, certain organisms have been found to degrade further DDA to dichlorobenzophenone (DBP), but the possibility that such degradation was due to microbial action could not be excluded....

Wedemeyer, Gary

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Year Published: 1967

Dechlorination of 1,1,1-Trichloro-2,2-bis(p-chlorophenyl)ethane by Aerobacter aerogenes

Whole cells or cell-free extracts of Aerobacter aerogenes catalyze the degradation of 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (DDT) in vitro to at least seven metabolites: 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene (DDE); 1,1-dichloro-2,2-bis(p-chlorophenyl)ethane (DDD); 1-chloro-2,2-bis(p-chlorophenyl)ethylene (DDMU); 1-chloro-2...

Wedemeyer, Gary

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Year Published: 1966

Uptake of 2, 4-Dichlorophenoxyacetic acid by Pseudomonas fluorescens

Factors influencing the uptake of the sodium salt of 2,4-dichlorophenoxyacetic acid (2,4-D), under conditions in which no net metabolism occurred, were investigated in an effort to determine both the significance of “nonmetabolic” uptake as a potential agent in reducing pesticide levels and the mechanisms involved. Uptake of 2,4-D was affected by...

Wedemeyer, Gary

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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 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.