The Stretch Reflex : (See Figure 13.15). The stretch reflex in its simplest form involves only 2 neurons, and is therefore sometimes called a 2-neuron reflex. The two neurons are a sensory and a motor neuron. The sensory neuron is stimulated by stretch (extension) of a muscle.
Flash floods are the most common flood type in normally-dry channels in arid zones, known as arroyos in the southwest United States and many other names elsewhere. In that setting, the first flood water to arrive is depleted as it wets the sandy stream bed.
NOAA map of flooding areas on June 18, 2011. The Missouri River is reflected by gages in the middle and top. Purple reflects heavy flooding and orange moderate flooding. U.S. Weather Service map showing number of precipitation inches above/below year to date at June 18, 2011.