![]() All the information is used to calculate real-time statisticsįEMA placed more than 20,000 communities in the United States in a category called Flood Zones. Each one of these communities is able to participate in the Agencies National Flood Insurance Program. Then the other factors are also measured like rainfall or water velocity past the station along with water quality in the area of the Station. This relation provides the current condition streamflow data from that station. United States Geological Survey (USGS) personnel wade in the water near a Stream gauge Station and take sets of measurements to make the measurement or do so from a boat, bridge, or cableway over the stream.įor each Gauging Station, like this one in the picture, a relation between gauge height and streamflow is determined by simultaneous measurements of gauge height and streamflow over the natural range of flows (from very low flows to floods). The most important data that is collected is the rising river water and inlet levels and climate changes along with river drainage changes. Most city officials and water managers often are more concerned with the height of the water in the river (river levels) than the streamflow quantity. Geological Survey (USGS) and runs more than 7,500 stream gages nationwide that allow for the assessment of the probability of floods. Information is gathered in the areas along rivers and waterways, collected in a certain place, called a Stream gauge. A stream gauge is a location on a river where the height of the water and the quantity of flow (streamflow) are recorded by a Gauge Station. To determine these probabilities all the annual peak streamflow values measured at a stream gauge are examined. Scientists use statistical probability (chance) to put a context to floods and their occurrence. If the probability of a particular flood magnitude being equaled or exceeded is known, then risk can be assessed. That can be used for information that is passed on for different reasons. If the probability of a particular flood magnitude being equaled or exceeded is known, then risk can be assessed for that area. ![]() In the 1960s, the United States government decided to use the 1 percent annual exceedance probability ( AEP) for floods as the basis for the National Flood Insurance Program. It can determine what properties are located in a specific Flood Zone. ![]() The Determinator, which is the company providing the Flood Zone Determination, will use FEMA’s flood maps, the county’s parcel maps, aerial photography, and other maps to figure out which flood zone is applicable to the property.
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