An absorbing dynamometer acts as a load that is driven by the prime mover that is under test (e.g. Pelton wheel). The dynamometer must be able to operate at any speed and load to any level of torque that the test requires.
While some causes are obvious, such as hurricanes and snow melt, many are not. Heavy Rains: Cresting rivers, backed-up storm drains, or saturated ground can cause significant floods. Heavy rains can contribute to flash floods, which are the number one weather-related killer in the United States. A flash flood is a rapid flooding of low-lying areas in less than six hours. Heavy rains also increase the chance of mudflows, rivers of liquid, and flowing mud.
On June 23, 2016, a flood hit areas of the U.S. state of West Virginia and nearby parts of Virginia, resulting in 23 deaths. The flooding was the result of 8 to 10 inches of rain falling over a period of 12 hours, resulting in a flood that was among the deadliest in West Virginia history. It is also the deadliest flash flood event in the United States since the 2010 Tennessee floods.