Banjir utawa Bena ya iku prastawa kang kadadéan minangka miline banyu muntah/luber ana ing daratan kang luwih endek. Pangarahan banjir Uni Éropah ngartekake banjir minangka parendeman sawatara déning banyu ing daratan sawatara lan bisa ngerusak lingkungan sakiteré kang kena bencana. Arti "banyu mili", tembung mau uga bisa diartekake déning  pasang laut.
Banjir kang diakibatake volume banyu ing sawijining panggonan ya iku ing kali utawa tlaga kang luber utawa njebol bendungan saéngga banyu metu saka bates.

Ukuran tlaga utawa badan banyu kang tambah utawa surut kacepak déning pagowahan curah udah lan lelehe salju ing mangsane, nanging banjir kang kadadéan ora gedhé minangka banyu kang luber ora kena pamukiman pandhudhuk utawa punjer-punjer kagiyatan kaya ta pasar,terminal lan sekolahan (désa,kutha)

Banjir gedhé 

Ing ngisor kapapar pratélan pratélan banjir paling bebaya sadonya kanthi gunggung kamatian kurang luwih 100.000 jiwa.

Uga delengen 

Kesiagaan bencana
Pangendalen banjir ing Walanda
Penaksiran risiko banjir
Pengarahan banjir
Banjir ing Walanda
Banjir ing Amérika Sarekat
Banjir ing Australia
Pratélan banjir
Pasang laut badai ing Laut Lor
Banjir Chicago, banjir gawéan kang ngelewati punjer kutha Chicago
Konsep gelombang banjir

Cathetan sikil

Bahan Wacan
O'Connor, Jim E. and John E. Costa. (2004). The World's Largest Floods, Past and Present: Their Causes and Magnitudes [Circular 1254]. Washington, D.C.: U.S. Department of the Interior, U.S. Geological Survey.
Thompson, M.T. (1964). Historical Floods in New England  [Geological Survey Water-Supply Paper 1779-M]. Washington, D.C.: United States Government Printing Office.
 Powell, W. Gabe. 2009. Identifying Land Use/Land Cover (LULC) Using National Agriculture Imagery Program (NAIP) Data as a Hydrologic Model Input for Local Flood Plain Management. Applied Research Project. Texas State University – San Marcos.

Pranala njaba 

U.S. Centers for Disease Control and Prevention (CDC) Healthy Water – Flood Water Exposure Health risks, cleanup of flood waters, and links to flood resources
Associated Programme on Flood Management from World Meteorological Organization
Decision tree to choose an uncertainty method for hydrological and hydraulic modelling, Choosing an uncertainty analysis for flood modeling.
DeltaWorks.Org Flood protecting dams and barriers project in the Netherlands
Video: Monsoon flooding, in Phnom Penh, Cambodia
Flood Risk Management Research Consortium
Flooding Risk and warning for Emergency Rescue Services
International Flood Initiative
International teaching module "Integrated Flood Risk Management of Extreme Events" (Floodmaster)
Predictions Off for Global Warming Flood Risk – Study.

Cuaca
 
Bencana cuaca
Banyu
Gelombang Banyu
Hidrologi