266 resultados para Rock fall


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University of Iowa Department of Anesthesia newsletter.

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University of Iowa Department of Anesthesia newsletter.

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University of Iowa Department of Anesthesia newsletter.

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University of Iowa Department of Anesthesia newsletter.

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University of Iowa Department of Anesthesia newsletter.

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University of Iowa Department of Anesthesia newsletter.

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Iowa Department of Transportation Newsletter. INSIDE Magazine is developed to help keep all Iowa DOT employees informed about critical issues affecting them, recognize DOT employees for their excellent service and share interesting aspects in the lives of our co-workers.

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A Newsletter from the Iowa Office of Consumer Affairs

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This DNR periodical contains current information on Iowa Fish and Wildlife Management.

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Quarterly newsletter produced by the Iowa Department of Blind, about the information and activities that are on going in the department.

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Earthen fills and back slopes resulting from highway building and other construction projects pose problems with respect to erosion stabilization and establishing vegetation cover. Sediments from such slopes create stream pollution while the erosion itself results in maintenance problems. Furthermore, adverse conditions aggravated by erosion prevent satisfactory establishing of vegetative cover. A dense vegetative cover is very effective in controlling erosion but even with optimum weather and soil conditions there is a delay of about 10 weeks between seeding and the establishment of a vegetative cover. Under actual field conditions, 3 months to a year may elapse between completion of construction and establishment of a vegetative cover. A research project was initiated early in 1974 to determine the effectiveness of a rock mulch of crushed limestone aggregates in controlling soil losses on highway construction back slopes in Iowa and to find the influence of such treatments on stand establishment of grasses and legumes.

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Newsletter on the activities of the University of Iowa Graduate College.