A question here as I don't know the answer,if this was not a road and an unknown area,
what would be the correct procedure?
Well, IT IS ACTUALLY A ROAD here! It dips in to a railroad underpass and the water is therefore much deeper there, then in the surrounding area!
As to the correct procedure; there are so many violations here, I'm not sure where to start.
The first and most important rule is:
NEVER DRIVE IN TO A BODY OF WATER, THAT DOES NOT CLEARLY LET YOU IDENTIFY IT"S DEPTH AND THE CONDITION OF THE SUBMERGED SURFACE!!!!!
This being very hard to comply with in murky, flooded areas, it would rule out 90% of flood water crossings from being attempted!
And remember, even when driving on a road that you are familiar with, if it is submerged, you can still get yourself in trouble because the flood waters might have washed out the road beneath the waters surface!
The crew in this video should have at least known to stop, when the water started to reach the bottom of the windshield, NOT THE TOP!!
They should have also realized that the flood waters in the underpass were to deep for their trucks by observing how little clearance was left between the bottom of the overpass and the waters surface!
If you absolutely have to attempt a crossing like this in an emergency, the smart thing to do is to have ONE truck slowly EASE in to the flooded area, while the other truck stands by to assist if necessary. If available, the first truck can attach a tow cable behind it that is already tethered to the second truck. This will allow the second truck to help retrieve the first truck, if it were to get in to trouble.
Just remember: Driving through flooded areas is one of the most dangerous things you can do in your car or truck and should be avoided if all possible!! BE SMART AND STAY ALIVE!!!