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number is associated with each possible FHF, and varies from 1 for a FHF of 005 to a maximum of 30 for a FHF of 200 or greater. Zone A: Special Flood Hazard Areas inundated by the 100-year flood, determined by approxi- mate methods; no base flood elevations shown or FHFs determined. Zones AI, A2, A4, A5, A6, A13, and A14: Special Flood Hazard Areas inundated by the 100-year flood; with base flood elevations shown, and zones subdivided according to FBFs. ZOne B: Areas between the Special Flood Hazard Areas and the limits of the 500-year flood; areas that are protected from the 100- or 500-year floods by dike, levee, or other local water-control structure; areas subject to certain types of 100-year shallow flooding where depths are less than 1.0 foot; and areas subject to 100-year flooding from sources with drainage areas less than 1 square mile. Zone B is not subdivided. ZOne C: Areas of minimal flood hazard; not sub- divided. The flood elevation differences, FHFs, flood insurance zones, and base flood elevations for each flooding source studied in detail in the community are summarized in Table 5. 5.4 Flood Insurance Rate Map Description The Flood Insurance Rate Map for the City of Montrose is, for insur- ance purposes, the principal product of the Flood Insurance Study. This map contains the official delineation of flood insurance zones and base flood elevations. Base flood elevation lines show the locations of the expected whole-foot water-surface elevation of the base (100-year) flood. The base flood elevations and zone numbers are used by insurance agents, in conjunction with structure elevations and characteristics, to assign actuarial insurance rates to structures and contents insured under the NFIP. 6.0 OTHER STUDIES A Flood Hazard Information report prepared by the U.S. Army Corps of Engineers covering the Uncompahgre River in Montrose County was completed 20