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A flood insurance rate map (FIRM) is an official map of a community within the United States that displays the floodplains, more explicitly special hazard areas and risk premium zones, as delineated by the Federal Emergency Management Agency (FEMA). [1]
When the people looked upstream, they saw a large wall of black muddy water rushing towards them. The water was carrying rocks and large logs the size of cars. The flood waters were approximately 6-foot tall and 40-feet wide. The flood swept away many of the swimmers while many other people were holding onto trees waiting to be rescued.
Non-SFHAs, which are moderate- to low-risk areas shown on flood maps as zones beginning with the letters B, C or X. These zones receive one-third of federal disaster assistance related to flooding ...
Payson is located in northern Gila County [11] —within the hilly and mountainous terrain of the Arizona transition zone. The town sits at an elevation of 5,000 feet (1,500 m), and it has a total area of 19.5 square miles (51 km 2 ). [ 5 ]
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On the new maps in Palm Beach County, about 5,000 properties have moved to a high-risk flood zone, also considered a "special flood hazard area," from a low- or medium-risk flood zone.
In Arizona, the highest rainfall total was 12.0 in (300 mm) at Mount Graham. In Tucson, flood waters were reportedly 8 ft (2.4 m) high. Throughout the state, excessive rainfall caused many rivers to overflow. After the rain ended, the Santa Cruz, Rillito, and Gila rivers experienced their highest crests on record.
The event was estimated as a 25-year flood (a flood having a 4% chance of occurring in any given year). Emergency work to widen the spillway was ordered by dam superintendent Thomas H. Brown. But by the 21st the spillway was being scoured by so much water that its bank closest to the dam broke.
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