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

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COMMUNITY NAME INITIAL IDENTIFICATION FLOOD HAZARD BOUNDARY MAP REVISIONS DATE FIRM EFFECTIVE DATE FIRM REVISIONS DATE Sedona, City of 1 January 24, 1975 May 30, 1978 November 16, 1983 September 30, 1988 September 3, 2010 (Coconino County) Sedona, City of 1 July 25, 1978 None August 19, 1985 (Yavapai County) March 9, 1999 September 3, 2010 Yavapai County July 25, 1978 None August 19, 1985 May 18, 1992 (Unincorporated Areas) September 20, 1996 December 19, 1997 June 8, 1998 March 9, 1999 September 3, 2010 1 This community did not have its own FIRM prior to the countywide FIS’s for Coconino and Yavapai Counties. The land area for this community was previously shown on the FIRM’s for the unincorporated areas of Coconino and Yavapai Counties, but was not identified as a separate NFIP community. Therefore, the dates for this community were taken from the respective FIRM’s. TABLE 10 FEDERAL EMERGENCY MANAGEMENT AGENCY YAVAPAI COUNTY, AZ AND INCORPORATED AREAS COMMUNITY MAP HISTORY
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. 62
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YAVAPAI COUNTY, ARIZONA AND INCORPO
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TABLE OF CONTENTS - Volume 1 Page 1
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TABLE OF CONTENTS - Volume 3 - cont
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TABLE OF CONTENTS - Volume 5 - cont
Page 9 and 10:
authority and acknowledgments for e
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In the March 29, 1983, revision, up
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The September 20, 1996, revision al
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update corporate limits, to change
Page 17 and 18: TABLE 2 - STREAMS STUDIED BY DETAIL
Page 19 and 20: TABLE 3 - LETTERS OF MAP CHANGE - c
Page 21 and 22: Precipitation in the study area is
Page 23 and 24: TABLE 4 - HISTORIC RECORDED DISCHAR
Page 25 and 26: The Verde Lakes Estates in the Town
Page 27 and 28: Problems created by large magnitude
Page 29 and 30: All flooding sources were analyzed
Page 31 and 32: approximately 1,600 feet downstream
Page 33 and 34: TABLE 5 - SUMMARY OF DISCHARGES FLO
Page 35 and 36: TABLE 5 - SUMMARY OF DISCHARGES - c
Page 47 and 48: Mapping, Inc. (Kenney Aerial Mappin
Page 49 and 50: 1985. It was determined from the si
Page 51 and 52: Values for the roughness coefficien
Page 53 and 54: TABLE 6 - MANNING'S "n" VALUES - co
Page 55 and 56: To minimize the impact of the levee
Page 57 and 58: ecommended as the approximate areas
Page 59 and 60: TABLE 8 - VERTICAL DATUM CONVERSION
Page 61 and 62: Approximate 1-percent annual chance
Page 63 and 64: e feasible in view of extremely hig
Page 65 and 66: average depths are between 1 and 3
Page 67: COMMUNITY NAME INITIAL IDENTIFICATI
Page 71 and 72: Cooper Aerial Surveys, Aerial Photo
Page 73 and 74: Kenny Aerial Mapping, Topographic M
Page 75 and 76: U.S. Department of the Army, Corps
Page 77 and 78: Joes Hill, Arizona (1969); King Can
Page 79 and 80: Pipe Creek Railroad Wash Silver Spr
Page 81 and 82: Manning’s “n” values were ass
Page 83 and 84: FLOODING SOURCE FLOODWAY 1-PERCENT-
Page 85 and 86: FLOODING SOURCE FLOODWAY 1-PERCENT-
Page 87 and 88: TABLE 9 FLOODING SOURCE FLOODWAY 1-
Page 93: TABLE 9 FLOODING SOURCE FLOODWAY 1-
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YAVAPAI COUNTY, ARIZONA Federal Emergency ... - FEMA Region 9

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