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Document Type

Research

Abstract

The proportion of land in given slope classes has been estimated for Iowa counties from a randomly selected sample. The sample, approximately 2 percent of the land area of the state, consists of about 4,500 individual tracts, each about 160 acres in size. A detailed soil map was made of each tract, using a 4-inch-to-the-mile aerial photograph as a base map, thus providing the basic information for a physical land-condition inventory. The data from the soil maps were projected to give estimates of physical land conditions by counties and for the state as a whole. On a state basis, nearly 60 percent of the state has slopes of less than 5 percent gradient, and almost 75 percent of the state has slopes of less than about 9 percent gradient. Summarized estimates of percent land in the 0-1, 2-4, 5-8, 9-13, 14-17, 18-24, and 24 plus percent slope classes are given for all counties of the state, and for the state.

Publication Date

1960

Journal Title

Proceedings of the Iowa Academy of Science

Volume

67

Issue

1

First Page

260

Last Page

267

Copyright

© Copyright 1960 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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