Water School

A 10-year flood is a high streamflow that overflows the natural or artificial banks of a waterway and has a 10% chance of occurring in any given year.

Datum is the basis for relating a river's stage to mean sea level. (datum + stage = elevation in feet above mean sea level)

A river's bank is the sloping ground that borders the watercourse and confines the water in the natural channel when the water level, or flow, is normal.

A gaging station is a site on a stream, lake, reservoir or other body of water where observations and hydrologic data such as gage height and stream discharge are obtained.

A tributary is a small river or stream that merges or flows into a larger river or stream. A river typically has several tributaries.Numerous tributaries feed into the Brazos River including the Clear, Salt and Double Mountain forks of the Brazos as well as the Navasota, Bosque, Nolan, and Little rivers and Yegua Creek. In addition, those tributaries each have several sub-tributaries, including numerous creeks as well as the Leon and San Gabriel Rivers, among others.

Erosion is the process in which soil is moved or carried away by water, air or other natural processes.