Warm, moist air masses that move inland from the Gulf of Mexico and the Atlantic Ocean tend to cool as they rise over the mountains. This cooling air loses its ability to retain moisture so the higher elevations receive an increasing amount of precipitation. Precipitation in the form of rain either enters the ground, runs off into streams, or evaporates. Winter snows temporarily delay this recycling. Once the rain or melted snow enters the ground it begins to slowly percolate down to the water table.
Natural springs occur throughout the mountains where the water table is close to the surface.
This water and the run-off of frequent rains results in streams that flow constantly the year round. Naturalist-conducted walks and events are another very enjoyable way to see the park, learn about nature and history, and meet other people. These walks may last an hour or two, or take all day, and are conducted on a seasonal basis. All of the Photo of The Sinks courtesy of Bobby Strange walks are suitable family activities. Schedules are posted in visitor centers and on campground bulletin boards.