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<br />the City, the flood plains were plotted on <br />Survey Digital Orthophotographic Quarter <br />map. Elevations are referenced to NGVD 29. <br /> <br />a U.S. Geological <br />Quadrangle (DOQQ) <br /> <br />Cross sections 3+30 to 58+14 are a composite of data from the <br />mapping provided by the city and channel data surveyed by <br />Valley Survey under contract to the City of Florence. The <br />field-surveyed cross sections (65+04 to 99+89) in the upstream <br />reach were placed on the DOQQ map using field coordinates <br />provided by Valley Survey. <br /> <br />As part of this revision, the format of the map panels has <br />changed. Previously, flood-hazard information was shown on <br />both the Flood Insurance Rate Map and Flood Boundary and <br />Floodway Map. In the new format, all base flood elevations, <br />cross sections, zone designations, and flood plain and <br />floodway boundary delineations are shown on the Flood <br />Insurance Rate Map and the Flood Boundary and Floodway Map has <br />been eliminated. Some of the flood insurance zone <br />designations were changed to reflect the new format. Areas <br />previously shown as numbered Zone A were changed to Zone AE. <br />Areas previously shown as Zone B were changed to Zone X <br />(shaded) . Areas previously shown as Zone C were changed to <br />Zone X (unshaded). In addition, all Flood Insurance Zone Data <br />Tables were removed from the Flood Insurance Study report and <br />all zone designations and reach determinations were removed <br />from the profile panels. <br /> <br />18 <br />