The Wadi Crossing After the Rain
After two days of heavy rain in the Hajar mountains, you are descending a rural road in a saloon car at 18:20 with your brother and two children aged 6 and 9. The road dips through a wadi crossing that is normally dry. Today water is running across the tarmac: about 30–35 cm at the deepest point in the middle, moving from right to left at walking pace and clearly carrying sand and gravel. The far side is 25 m away and the road beyond is partly covered in wet sand. A local pick-up crossed about 20 minutes ago and is now visible on the far bank. There is one bar of phone signal. Another saloon has stopped behind you and its driver is sounding the horn impatiently. Your car has about 15 cm of clearance below the sill.
1. Do you cross? Justify the decision.
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No. Water 30–35 cm deep and moving at walking pace is in the range that floats and shifts a light saloon; a car can lose grip and be pushed sideways in well under half a metre of flowing water, and 15 cm of sill clearance gives no margin once the nose drops into the dip. The pick-up's crossing 20 minutes ago proves nothing: it has more clearance, it was driven by someone who knows the crossing, and the water may have risen or the bed may have scoured since. Beyond the water, wet sand and gravel hide the edge of the tarmac and any washed-out culvert. With two children aboard, one bar of signal and failing light, stop well back with hazard lights on, turn around where it is safe, and wait on high ground or take another route.
2. What if the engine stops while the car is in the water?
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Do not try to restart it. Water drawn into the intake will wreck the engine and you will be stuck in a rising flow. Abandon the car immediately. Unclip the children and get out through the door on the upstream side if the flow is strong, since the car is then less likely to be pushed onto you, or through the windows if the doors will not open. Move to the bank and uphill, away from the crossing, and take nothing with you. Then call 9999 for the Royal Oman Police, giving the location precisely and the number of people involved. A stalled car in a wadi can be swept away within minutes if more rain falls upstream, so people first and property never.
3. How do you deal with the impatient driver behind, and what about the wet sand beyond the crossing?
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The horn is social pressure, not a right of way. Signal clearly, and if the road is wide enough move over or reverse to give the impatient driver room. If he chooses to take the risk, that is his decision, but he must not push you into the water and you should not stand in the road arguing with him. The wet sand beyond the crossing is its own hazard: it cuts grip, hides the road edge and any washed-out shoulder, and soft sand can pull a car sideways. If you ever do cross shallow water, use first or second gear at a steady slow speed, do not stop or change gear mid-crossing, and test the brakes gently once you are clear.