YAVAPAI COUNTY, ARIZONA Federal Emergency ... - FEMA Region 9

The only other study completed for the Town of Clarkdale is a report prepared by the
USACE entitled, "Floodplain Information, Verde River and Tributaries, Vicinity of
Clarkdale and Cottonwood, Yavapai County, Arizona", (USACE, August 1976). This
report covers some areas studied for the FEMA study. A comparison of 1-percent annual
chance flood elevations and flood profiles presented in the Town of Clarkdale study with
those obtained by the USACE shows general disagreement between the two studies. The
source of these differences was mainly attributed to differences in expected accuracy
obtainable from the topographic information utilized to complete the two studies. The
USACE utilized a topographic map at a scale of 1:4,800, with a contour interval of 5 feet.
The study contractor for the FEMA study for the Town of Clarkdale utilized a
topographic map at a scale of 1:2,400, with a contour interval of 2 feet. The discrepancy
in flow profiles between the results obtained by the USACE and the study contractor was
resolved through communications with the USACE, Los Angeles District Office.
There are two known flood studies completed for the Town of Cottonwood. One was
prepared by the USACE and is entitled, "Flood Plain Information, Verde River and
Tributaries, Vicinity of Clarkdale and Cottonwood, Yavapai County, Arizona" (USACE,
August 1976); and the other is the original FIS for the City of Cottonwood, Arizona
(FEMA, 1981). The 1976 report by the USACE covers some of the same areas that were
studied for this study. A comparison of 1-percent annual chance elevations and flood
profiles presented in this study with those obtained by the USACE shows general
disagreement between the two studies. These differences were mainly attributed to the
differences in expected accuracy obtainable from the topographic information utilized to
complete the two studies.
The City of Sedona has a separately published Floodplain Management Study prepared
by the Soil Conservation Service (Soil Conservation Service, et cetera).
This report either supersedes or is compatible with all previous studies published on
streams studied in this report and should be considered authoritative for the purposes of
the NFIP.
8.0 LOCATION OF DATA
Information concerning the pertinent data used in the preparation of this FIS can be
obtained by contacting FEMA, Federal Insurance and Mitigation Division, 1111
Broadway, Suite 1200, Oakland, California 94607-4052.
9.0 BIBLIOGRAPHY AND REFERENCES
Aerial Mapping Company. (April 1994). Topographic Maps, Portions of Yavapai
County, Scale 1:4,800, Contour Interval 4 feet.
Aerial Mapping Company. (October 1993). Topographic Maps, Portions of Yavapai
County, Scale 1:2,400, Contour Interval 4 feet.
Aerial Mapping Company, Inc. (October 1993). Topographic Maps for Cherry Creek,
Scale 1:4,800, Contour Interval 4 feet.
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