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.

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