Stream Gauges
Stream Gauges are the best permanent markers for measuring water depths of rivers, streams, lakes, ponds, and swamps. They're also known as Water Depth Markers, Water Flow Gauges, Flow Meters, Staff Gauges, or Water Depth Gages. These work very well for anyone that studys the elevation of water levels, and water flow such as hydrologists or environmental scientists. Some stream gauges are numbered and some are un-unnumbered with number plates that are sold separately.