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To limit this surcharge to 1.0-foot, a \u201cfloodway\u201d is designated which restricts development to only the areas outside of the floodway.AO- Areas of shallow 1%-annual chance flooding [1 to 3 feet depth]. This is a detailed floodplain depicting sheet flow on sloping terrain. Instead of a base flood elevation, average depths within the floodplain as shown on the Flood Insurance Rate Map. For areas of alluvial fan flooding, velocities are also provided.AH-Areas of shallow 1%-annual chance flooding [1 to 3 feet depth]. This is a detailed floodplain depicting areas of ponding. Base flood elevations are provided on the Flood Insurance Rate Map. Flood insurance is available in any zone but rates differ. In Zone X, a Preferred Risk Policy can be purchased at rates as low as $129 per year. In A zones, flood insurance rates for structures below the BFE, may be as high as $5000 per year.Shaded X- Represents 1 of 3 things:-0.2%-annual chance floodplain-1%-annual chance floodplain with average depth < 1 foot or having a drainage area less than 1 square mile-Areas protected by levees from the 1%-annual chance floodUnshaded X- Areas outside of 0.2%-annual chance floodplainWhen FEMA originally produced the FIRMs, they focused on areas that were developed or developing. This explains why the majority of eastern Riverside County is Zone D.D- Areas that have not been studied by FEMA. Flood hazards are undetermined but possible. 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