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Areas subject to inundation by the 100-year flood in Avra Valley, Pima County, Arizona

Water-Resources Investigations Report 78-33

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Abstract

Avra Valley in Pima County, Arizona, is sparsely populated and is used mainly for agriculture and cattle grazing; however, its proximity to Tucson makes it desirable for urban development. Administrators and planners concerned with future land development may use the map report to determine the approximate areas that are subject to inundation by the 100-year flood. Avra Valley is drained mainly by Brawley Wash; Blanco Wash drains the west side of the valley. Most of the natural drainage system consists of small braided channels bordered by narrow bands of dense vegetation, which cause floodwater to spread over wide areas of shallow depths. During the 100-year flood, the areas inundated by Brawley and Blanco Washes may join in several places. (Woodard-USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Areas subject to inundation by the 100-year flood in Avra Valley, Pima County, Arizona
Series title:
Water-Resources Investigations Report
Series number:
78-33
Edition:
-
Year Published:
1978
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
1 map :col. ;87 x 38 cm., on sheet 102 x 94 cm., folded in envelope 30 x 24 cm.