We have all flown on a wet winter morning scared for our lives thinking what will happen with all the water around. Yet, flying with water around is one of the inherent problems that an aircraft designer works on when he finalises the design of the aircraft. The main challenge here is to ensure that when the aircraft is flying or taking off or landing on a runway full of water, the flow should not enter the engine nascals. Given the high temperature of the combustion chamber, any entry of water could prove to be an absolute disaster.
This is the reason why the engine cowlings are made the way they are. They extend up in front of the engine blades to ensure that the flow of water is stayed out and the positioning or mounting of the engine too on the wing is to be done in a way that the water does not enter when the aircraft is running at maximum possible ground speed when landing or taking off. So, after all of this is done and designed, how exactly is an injestion test carried out on an aircraft?
Here is an interesting video uploaded by Airbus to show a typical water injestion test that certifies the plane, whether it can fly or not using wet runways, take a look: