Flash flood in a Moroccan oued: what to do?

A Moroccan oued is a dry riverbed that stays empty for most of the year. When rain falls in the mountains or far upstream, water can arrive suddenly and with enormous force, even under a clear sky at your location. Flash floods in oueds are one of the leading causes of drowning deaths among hikers, campers and drivers in North Africa. The single most important rule is simple: get out of the riverbed and go up.

Emergency warning

If water is already rising, or you hear a roaring sound, treat it as an emergency. Move to high ground immediately and call local emergency services (in Morocco, dial 15 for ambulance and fire, or 19 for police) once you are safe. Do not wait to collect belongings.

What is happening

Oued floods are caused by rainfall that may be many kilometres away. The ground in dry catchments absorbs little water, so runoff concentrates fast into the channel. A trickle can become a wall of brown water carrying rocks, mud and debris within minutes. The flood usually passes in a few hours, but the peak is violent and unpredictable.

Warning signs to watch for

• Dark clouds, thunder or rain visible over nearby mountains, even if you are dry.
• A sudden change in water colour or a muddy trickle starting in the bed.
• A low rumbling or roaring sound, like a train or heavy truck.
• Birds and animals moving quickly out of the riverbed.
• Local people leaving the area or warning you in Arabic or Amazigh. Take this seriously.

What to do first

1. Leave the riverbed on foot. Climb the nearest stable slope, not a sandy bank that may collapse.
2. Go well above the high-water line. Look for debris and mud marks on rocks and trees and stay above them.
3. Abandon vehicles, tents and gear. A car can be swept away in shallow fast water. People inside often drown.
4. Do not cross to reach the other side. If you are already on the far bank, stay there and go up.
5. Keep children and animals close and hold hands in a group so nobody is left behind.
6. Call for help once you are on safe high ground, and give your location, the number of people and any injuries.

What NOT to do

• Never walk, swim or drive through moving floodwater. Even 15 cm of fast water can knock an adult off their feet, and 30 cm can move a small car.
• Do not shelter under bridges, in culverts or in narrow gorges where water funnels.
• Do not stand on the edge of the bank to take photos or watch the water arrive.
• Do not try to rescue someone by entering the water. Throw a rope, a float or a long branch and call for trained help.
• Do not return to the oued until the water has clearly dropped and local people say it is safe. A second surge can follow.

When to call for help

Call emergency services if anyone is missing, trapped, injured or in the water. Give the exact location, for example the nearest village, road or landmark, because oueds often have no address. If you have no signal, send someone to the nearest settlement for help while the rest of the group stays on high ground.

How to prevent it

Before camping or hiking in an oued, check the weather forecast for the whole catchment, not just your spot. Ask local guides about recent rain and safe routes. Never camp in the bed itself, pitch tents on high ground, and park vehicles facing out on high ground. Keep a charged phone and a whistle, and agree a meeting point on high ground before you set out.

This is general safety information, not a substitute for professional advice. In a real emergency, call local emergency services immediately.