What is freeboard flooding?

a. An additional amount of height above the Base Flood Elevation used as a factor of safety (e.g., 2 feet above the Base Flood) in determining the level at which a structure’s lowest floor must be elevated or floodproofed to be in accordance with state or community floodplain management regulations.

What is the concept of flooding?

Overview. Floods are the most frequent type of natural disaster and occur when an overflow of water submerges land that is usually dry. Floods are often caused by heavy rainfall, rapid snowmelt or a storm surge from a tropical cyclone or tsunami in coastal areas.

What is flooding and its types?

There are two basic types of floods: flash floods and the more widespread river floods. Flash floods generally cause greater loss of life and river floods generally cause greater loss of property.

What does AEP flood mean?

Annual Exceedance Probability
The USGS and other agencies often refer to the percent chance of occurrence as an Annual Exceedance Probability or AEP. An AEP is always a fraction of one. So a 0.2 AEP flood has a 20% chance of occurring in any given year, and this corresponds to a 5-year recurrence-interval flood.

What does freeboard mean?

Definition of freeboard 1 : the distance between the waterline and the main deck or weather deck of a ship or between the level of the water and the upper edge of the side of a small boat. 2 : the height above the recorded high-water mark of a structure (such as a dam) associated with the water.

How does flooding work in psychology?

Flooding. Flooding (also known as implosion therapy), is a type of exposure therapy, which works by exposing the patient directly to their worst fears. (S)he is thrown in at the deep end.

What are the three types of flooding?

The 3 Most Common Flood Types

  • River floods occur when water levels run over river banks, as a result of heavy rain.
  • Coastal floods occur around much larger bodies of water, usually when the tide gets very high.
  • A flash flood is an excessive amount of rain in a short period of time (usually within 6 hours).

What is Ari and AEP?

The terms AEP (Annual Exceedance Probability) and ARI (Average Recurrence Interval) describe the probability of a flow of a certain size occurring in any river or stream. ARI is the average time period between floods of a certain size. For example a 100-year ARI flow will occur on average once every 100 years.

What does PMF flood mean?

Probable Maximum Flood
Probable Maximum Flood (PMF). The largest flood that could conceivably be expected to occur at a particular location, usually estimated from probable maximum precipitation. The PMF defines the maximum extent of flood prone land, that is, the floodplain.

What is freeboard in flood modelling?

“Freeboard” tends to compensate for the many unknown factors that could contribute to flood heights greater than the height calculated for a selected size flood and floodway conditions, such as wave action, bridge openings, and the hydrological effect of urbanization of the watershed.

What is a freeboard in safety?

In this manner, the freeboard corresponds to a fundamental element in the operational safety in the ample sense of word: sustainability (license to operate) and safety to people and environment.

What is Flooding (psychology)?

Flooding (psychology) Flooding, sometimes referred to as in vivo exposure therapy, is a form of behavior therapy and desensitization—or exposure therapy—based on the principles of respondent conditioning.

What is the importance of the freeboard on a dam?

Its importance resides in that an adequate freeboard minimizes the possible uncontrolled spilling of water and/or tailings on the dam, avoiding socials and environmental impacts downstream of impoundment.