Alternate Methods of Stabilizing Degrading Stream Channels in Western Iowa, Phase I, HR-208, 1980

(1980) Alternate Methods of Stabilizing Degrading Stream Channels in Western Iowa, Phase I, HR-208, 1980. Transportation, Department of

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Abstract

Since the beginning of channel straightening at the turn of the century, the streams of western Iowa have degraded 1.5 to 5 times their original depth. This vertical degradation is often accompanied by increases in channel widths of 2 to 4 times the original widths. The deepening and widening of these streams has jeopardized the structural safety of many bridges by undercutting footings or pile caps, exposing considerable length of piling, and removing soil beneath and adjacent to abutments. Various types of flume and drop structures have been introduced in an effort to partially or totally stabilize these channels, protecting or replacing bridge structures. Although there has always been a need for economical grade stabilization structures to stop stream channel degradation and protect highway bridges and culverts, the problem is especially critical at the present time due to rapidly increasing construction costs and decreasing revenues. Benefits derived from stabilization extend beyond the transportation sector to the agricultural sector, and increased public interest and attention is needed.

Item Type: Departmental Report
Keywords: Bridges and culverts, Channels (Waterways), Degradation (Hydrology), Pile caps, Preservation, Reinforced concrete bridges, Structural analysis
Subjects: Transportation
Transportation > Bridges and tunnels
Transportation > Roads and highways
Transportation > Research
Transportation > Economics, finance, and taxes
Transportation > Maintenance and preservation
ID Code: 17336
Deposited By: Iowa DOT Library
Deposited On: 02 Jul 2014 18:35
Last Modified: 05 Feb 2015 19:54
URI: http://publications.iowa.gov/id/eprint/17336