Flood Stage 4 : The height of the river at which property damage begins to occur. Often differs from bankfull. The river may overflow its banks into flood plain without reaching flood stage
National Weather Service NWS, Eastern Region Headquarters, A Guide To Developing A Severe Weather Emergency Plan For Schools (For Eastern Region Bohemia, NY), Appendix B: Glossary of Weather Terms (Flood), Baltimore-Washington Forecast Office, USA 2015. http://www.erh.noaa.gov/lwx/swep/swep.pdf, (ND Emr/ Flood - Amer) {952}
