Mississippi River Shoaling: A Diagnostic Study
The field study was conducted to collect definitive data on the flow and sediment movement characteristics in the recurrent shoaling reaches of the Mississippi River in the vicinities...

Pesticide Loadings, Reactions, and Transport

Stresses in Rigid Pipe
In 1930 Marston theorized that earth pressures on a rigid pipe would assume bulb-shaped patterns. The theory was confirmed in experiments carried out at Iowa Engineering Experiment Station....

Borehole Shear Test for Stiff Soil
The Iowa Borehole Shear Test (BST) is a rapid, direct shear test performed on the walls of borehole in soil. The test measures in-situ soil shear strength by failing the soil along the...

Voluntary Maintenance of Professional Development
The mandatory or voluntary concept for continuing professional development for license renewal is discussed. The question: As a requirement for license renewal should legal procedures...

Modulus of Soil Reaction Values for Buried Flexible Pipe
A table of modulus of soil reaction (E') values for use in the Iowa Formula has been empirically developed by the Bureau of Reclamation. Use of the methods and values suggested...

Formulation of Iowa State Airport System
An adaptation of the map method was used to identify general aviation airports appropriate for inclusion in the Iowa State Airport System. In this analysis, direct economic benefits were...

Regional Transport Development and Economic Growth
Transportation plans and economic development plans for regional development are postulated with the presumption that the resulting pattern of land uses and activities resulting therefrom...

Peak-Hour Transit Routing
Transit routes radiating from the CBD are typical of most city bus operations. This type of routing has existed since the late 1920's with major changes primarily in the form...

Service Load and Fatigue Tests on Truss Bridges
With the construction of the Saylorville Dam and Reservoir on the Des Moines River in Iowa, six highway bridges were scheduled for removal. Two of these were incorporated into a comprehensive...

Recycling Refuse Into Energy
Some 50% of large cities, 10% of small ones reportedly are talking about recycling their municipal refuse. Several are building facilities or have recently begun operations. This article...

Soil Erosion and Sediment Transport from Gullies
Field observations of four gullied watersheds, 74 acres to 150 acres (30 ha-61 ha) in size, showed that gully erosion was one-fifth of the total sediment yield during a 9-yr period. Erosion...

Reservoir Project Environmental Study
The research-management principles and methods used in conducting an interdisciplinary environmental resources study are summarized as an aid in complying with the federal NEPA requirements....

Trends in P.E. License Renewal Requirements
Pending legislation in the states of California, Florida, Wisconsin, and Iowa dealing with professional licensing requirements has stimulated increased study into programs of continuing...

Slipform Pavers Prove Their Versatility
Slipform pavers were developed in Iowa to pave thin 6-in. (150-mm) concrete pavements just 10-ft (3-m) wide for country farm-to-market roads. Since the first mile of road was built in...

News in Bridge Decks
This is the second of two articles on short span bridges. The first, in the July issue, described cost-cutting ideas in design. This article focuses on bridge decks: expansion joints,...

Five Year Study of Des Moines River Water Quality

Hydrology and Erosion of Loessial Watersheds
Five agricultural watersheds in the Missouri Valley deep loess soils region in western Iowa were instrumented to determine their hydrology, gully erosion, and surface erosion. Two watersheds...

Irrigation Scheduling on the Minidoka Project, Iowa

Iowa's Dilemma — OR — The Iowa Dilemma

 

 

 

 

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