​Maryland is subject to flooding from several different sources. Flash floods tend to come after short periods of heavy rain and most often affect small streams and creeks. General flooding comes from more prolonged steady rain and tends to affect larger streams and rivers. Major rivers such as the Potomac and Susquehanna often reach flood stages because of events in distant areas of their watershed. Finally, hurricanes and tropical storms can cause surges that create tidal flooding along Maryland’s bays and their tributaries.

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Before a flood

• Make sure your insurance policy covers flooding. Even renters are eligible for flood insurance.
• Move furniture and valuables to higher floors as floodwater rise.
• Keep the car gas tank filled in case you need to evacuate.
• Stay informed about weather conditions....flash flooding can occur in only minutes!
  

Do not drive through flooded roadways. The road may not be there. Follow the instructions given by emergency officials. If told to evacuate, do so!

After a flood

• Do not eat or drink anything that has come into contact with flood water.
• Follow emergency officials' instructions on safe water consumption. You may have to boil your water.
• Clean and have electrical equipment checked before using.
• Report broken utilities to the proper authorities.
• NEVER play around high water, storm drains, downed utility lines, etc.
• Use flashlights, not an open flame like a candle. Candles are a fire hazard and could cause an explosion if it comes into contact with flammable gases.
• Watch out for snakes and other "stray" animals. Water will cause snakes to come out of the ground with nowhere to go. Many other animals may be abandoned and lost. Never kill snakes or other animals as they will eventually lead to a rodent problem.
• Remember, floodwaters sometimes take days to rise, even when the sun is shining. It can take days for floodwaters to make their way downstream. Don't underestimate the power and speed in which flood waters can rise and destroy everything in its path.