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

the shaded Zone X area to the north was recommended as the approximate area of
1-percent annual chance flooding in the event of failure of the levees.
Levee structure with inventory ID # 18 and levee-like structure with inventory ID
#60 are located on Dead Mule Canyon Wash. Based on the FIS and topographic
information from the USGS (i.e., 10m DEMs), the shaded Zone X area to the
north was recommended as the approximate area of 1-percent annual chance
flooding in the event of failure of the levees. The approximate area was extended
to Ramsgate Wash based on engineering judgment and the topographic
information.
Levee with inventory ID # 19 is located on Willow Creek. Based on the FIS and
topographic information from the USGS (i.e., 10m DEMs), the shaded Zone X
area to the east was recommended as the approximate area of 1-percent annual
chance flooding in the event of failure of the levees. The approximate area was
extended to tie back in with the detailed flooding downstream based on
engineering judgment and topographic information.
Levee with inventory ID # 20 is located on Dry Creek. The approximate areas of
1-percent annual chance flooding in the event of failure of the levee were
determined based on redelineation of the Dry Creek base flood elevations on the
landward side of the levee using topographic information from the USGS (i.e.,
10m DEMs).
Levee-like structure with inventory ID # 27 is located on South Rocky Boy Wash.
Based on a review of the effective flood hazards and aerial imagery, it appears
that the effective flooding is contained in the channel at this location. As this
levee-like structure appears to be a channel not a levee, no change in the
floodplain is recommended at this location.
Levee-like structure with inventory ID # 31 is located on Big Bug Creek.
Topographic information obtained from 10 meter USGS DEMs indicate that the
effective Zone A was correctly shown, and the levee-like structure did not have
any influence on the extent of the existing Zone A boundary. Therefore, there is
no change in the floodplain.
Levee-like structure with inventory ID # 42 is located on Timon Wash. Based on
the FIS and topographic information from the USGS (i.e., 10m DEMs),
approximate areas of 1-percent annual chance flooding in the event of failure of
the levees were determined based on engineering judgment.
Levee-like structure with inventory ID # 43 is located on Green Wash. Based on
the FIS and topographic information from the USGS (i.e., 10m DEMs),
approximate areas of 1-percent annual chance flooding in the event of failure of
the levees were determined based on engineering judgment.
Levee-like structure with inventory ID # 61 is located on Ramsgate Wash. Based
on the FIS and topographic information from the USGS (i.e., 10m DEMs), the
shaded and unshaded Zone X areas between the detailed flooding were
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