Water flowing into a sinkhole can cause it to expand and become more active. If there is a danger of people or animals falling into the depression, it can be filled with clayey sand, preferred, to slow water movement. If you have a sinkhole on a large property, and it is not actively developing or impacting some activity on the property, it can be left alone. Small sinkholes often require only filling with clean sand and soil. Erosion of the edge of the sinkhole may continue for several days, and heavy rainfall can prolong the stabilization. Slumping of the sediments along the sides of the sinkhole may take approximately a day's time to stop. The initial hole that forms may continue to grow over a period of minutes to hours to day(s) depending upon the size and scale of the sinkhole. Sinkholes can vary from a few feet to hundreds of acres and from less than 1 foot to several thousand feet deep. If there is not enough support for the land above the spaces, then a sudden collapse of the land surface can occur. Prepare Your Organization for a Hurricane Playbook: Prepare your organization for a hurricane with this in-depth document from America's PrepareAthon! and Ī sinkhole is a hole in the ground caused by the erosion of the earth below its surface. How to Prepare for a Hurricane: Prepare for a hurricane with this in-depth document from FEMA. or 5 are classified as major hurricanes and although this range only accounts for 20 percent of hurricanes that reach landfall they are responsible for more than 70 percent of hurricane damage in the United States. Hurricanes are classified by their intensity on the Saffir-Simpson Scale, which categorizes hurricanes based on their maximum sustained wind speeds on a scale of 1 to 5, with 5 being the most intense. Coastal areas are also vulnerable to storm surges, wind-driven waves, and tidal flooding. This is because the water temperature and evaporation rates are at their height.Īssociated with these storms are strong damaging winds, heavy precipitation, and tornadoes. The Atlantic hurricane season stretches from June 1st to November 30th with the peak of hurricane season being in August and September in the Northern Hemisphere. On average, about ten tropical storms are named and about six of them become hurricane strength in the southeast region of the United States. Hurricanes are a much larger and more powerful storm with an average diameter of 350 miles. When winds reach a sustained speed of 74 miles per hour it becomes a hurricane. As the tropical depression continues to develop in intensity the winds will increase and when the winds reach a sustained wind speed of 39 miles per hour the system is then a tropical storm and is given a name by the National Hurricane Center. If the tropical disturbance lowers in pressure and starts to rotate around a low pressure center, the tropical disturbance can turn into a tropical depression. These tropical disturbances that affect North America typically originate off the west coast of Africa. Conditions that lead to the formation of a hurricane includes warm waters, rotation of the earth, and the absence of vertical wind shear.Īll hurricanes start as a tropical disturbance. Hurricanes are powerful tropical storms in which winds rotate around a closed circulation of low-pressure in a counter-clockwise direction. Inland Flooding Toolkit for Businesses: Use this toolkit to prepare your organization for inland flooding. Prepare for Flooding with FloodSmart: Take the steps to prepare for flooding not just to protect yourself but your home and valuables as well. Flash floods are distinguished from regular floods by having a timescale of fewer than six hours between rainfall and the onset of flooding. Flash floods may also occur after the collapse of a natural ice or debris dam, or a human structure such as a man-made dam. Floods can also occur in rivers when the flow rate exceeds the capacity of the river channel, particularly at bends in the waterway. Floods often cause damage to homes and businesses if they are in the natural flood plains of rivers.įlash Flooding - A flash flood is a rapid flooding of low-lying areas: washes, rivers, dry lakes, and depressions. It may be caused by heavy rain associated with a severe thunderstorm, hurricane, tropical storm, or meltwater from ice or snow flowing over ice sheets or snowfields. While the size of a lake or other body of water will vary with seasonal changes in precipitation and snow melt, these changes in size are unlikely to be considered significant unless they flood property or cause serious damage. Flooding - Flooding may occur as an overflow of water from water bodies, such as a rivers, lakes, or ocean, in which the water overtops or breaks levees, resulting in some of that water escaping its usual boundaries, or it may occur due to an accumulation of rainwater on saturated ground in an areal flood.
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