Severe Weather: Flooding and Flash Flooding

Flooding is the most common natural disaster, killing more people in South Africa than any other type of natural disaster. Floods can develop over a period of a few days, or in cases of a flash flood, in a few minutes - sometimes without any signs of rain.

Flood: Any high flow, overflow, or inundation by water which causes or threatens damage.

Flash Flood: A rapid and extreme flow of high water into a normally dry area, or a rapid water level rise in a stream or creek above a predetermined flood level, beginning within six hours of the causative event (e.g., intense rainfall or dam failure). However, the actual time threshold may vary in different parts of the country. Ongoing flooding can intensify to flash flooding in cases where intense rainfall results in a rapid surge of rising flood waters.

The SAWDOS constantly  warn people of the danger of driving through flooded areas. Over half of all flood-related drownings in South Africa occur when a vehicle is driven into flood water.  The second highest percentage of drownings in South Africa are from people who walk into or near flood waters.

People generally under estimate the force of moving flood water. Just 60cm of water can move or lift a car, even a truck or SUV. Only 15cm of water is necessary to sweep you off your feet.

If flooding occurs, take the following precautions:

• Move to higher ground and stay away from low-lying flood-prone areas
• Do not allow children to play in flood waters, no matter how fun it might look
• Never drive on a flooded road
• Do not set up camps along streams or washes when there's a chance of rain or thunderstorms
• Be extra cautious during nighttime flooding situations
• Do not try to cross rivers, ravines or flooded areas.
• All people living along streams, creeks and rivers should be on alert anytime heavy rain falls in the area.
• Be prepared to evacuate.
• If told to leave, do so immediately.
• Never drive through water flowing over a bridge 
• If the car becomes trapped, get out and move to higher ground. 
• If your car stalls, abandon it immediately and climb to higher ground. Many deaths have resulted from attempts to move stalled vehicles.
• Evacuation is much simpler and safer before flood waters become too deep for ordinary vehicles to drive through.

The SAWDOS issue the following flood-related advisories:

Flood Advisory:

A hazardous flood event could develop.

Flood Watch:

The expectation of a flood event has increased. Usually this means that somewhere within the watch zone, a flood is expected. If you're in the watch area, you should pay attention to SAWDOS Twitter and Facebook Updates or local radio news in case a warning is issued.

Flood Warning:

Flash flood warnings, flood warnings, or flood advisories are issued when flooding is occurring or imminent.

- SAWDOS