Water School

What is flood stage?

Flood stage is an established gage height within a creek or river above which a rise in water surface level is described as a flood. This is the elevation at which the overflow of the natural banks of a stream or body of water begins.

The gage height is the height of the water surface above a predetermined point. Once the gage height becomes too high in the lowest bank of reach this is when flood damage begins to impact an area. The National Weather Service uses gage height numbers to inform people and communities about different levels of flooding hazards.

Return to Water School to learn more about water!

High Water Level Terminology (weather.gov)
Why We Use Gage Height - Water Data For The Nation Blog (usgs.gov)




The information provided on this site is intended as background on water within the Brazos River basin. There should be no expectation that this information is all encompassing, complete or in any way examines every aspect of this very complex natural resource.

If you have questions about a post or would like additional information, please contact us or call 888-922-6272.

agriculture contaminants water supply cfs gas mainstem water clarity brackish recreation employment limestone sanitation water code indirect re-use mgd reservoirs aerobic water use sludge emergency use fish kill effluent subsidence district main stem chlorine subsidence insurance potable parasite bay corps of engineers well gulf pollutants electricity precipitation acre-foot climate farming TCEQ municipal streamflow inland organic maps clarity wetlands possum kingdom E. coli lake agricultural flood control lake watercourse riverine environmental meta tag invasive plants measure acre-feet USGS water dock environment bottled water watershed taste minerals fertilizer rights beneficial use smell hunting reservoir algae rain wastewater allens creek reservoir legislation jobs gate wildlife oxygen sewage riparian habitat consumption mitigation filter depth inundated corps hydrologic cycle infection industry channel dam ground water monitor solids lake levels conservation groundwater system hydrilla golden algea aquifer water plants hydropower golden algae water cycle anaerobic electric companies runoff canoeing sediment marsh tributary evaporation storage soil bed and banks permit PAM drilling wetland flood salinity landscaping surface water river water rights kayak chlorides contract gage salt water quality water treatment lawn turbidity fork dissolved solids subwatershed basin impound speaker lakes E coli mission stream canoe quality septic system authority calcium drinking water biosolids releases classification direct re-use map governance fishing lake level treatment camping hydrology medicine pharmaceuticals estuary planning boating septic appropriation costs use Board spring granbury supply streamflow water planning drought flood pool spillway xeriscape volume industrial