Unfortunately, heavy rain and flooding roads are involved in many places. Although the rain itself can reduce visibility and cause handling problems, a flooded area can make your car work fast. People often underestimate how little water is consumed to stop their cars: six inches of standing water
can be enough to stop the engine, while as small as four inches deep can take you to drive.
Even in less severe cases, there is still a considerable risk. It is recommended to avoid these parts of floods whenever possible. However, if you can't move it, extra precautions must be seen to see you on the other side.

In this article:
Part 1: Explains how to assess the flooded area
Part 2: Describes how to pass through a flooded area
Part 3: Advises you what to do in an emergency.

Part 1: How do you assess the prospects of a flooded zone?
With sufficient visibility on the
ground, it should be clear whether a section of the road is under water or not. While the vast majority of these cases are usually puddles and very little inundation, even these small cases can prove dangerous if a driver does not adjust his driving style accordingly.
Basically, you should plan your route around the flood when the water is so deep that you can not see the bottom. If so, is there an alternative route that you can choose?
Note warning signs, barricades and posts in front of the flooded street. If the area is sufficiently busy and active, there may be indications that the driver is already getting directions.
If you want to estimate the depth and risk of flooding yourself and are not sure, you may want to wait for other vehicles to pass through. When a car passes, you can see how it affects the vehicle and check if it is a hazard or not.
When you are alone, it can be helpful to stop the car, get out and measure the depth with a stick or the end of an umbrella. When it rains and the water is cloudy, it can be impossible to determine the depth only with the eyes.
If the flooding is potentially dangerous, the choice of vehicle is very important. A Land Rover or a truck with high suspension will have a much easier way to successfully control the flooded space than a compact sedan.
In addition, it is important to consider your insurance in case of default. A stronger policy will avert part of the risk that goes into it. Conversely, you would rather hesitate if repairs or disruptions would incur significant personal costs.

Part 2: When driving through a flooded area, do it slowly and carefully
Turn off your air conditioner before entering the flooded room. This prevents water from being accidentally sucked into the engine compartment and blocking the car.
When you drive through, be slow and calm with your movement and do not stop until you have completely gone through the danger. Especially when the water is running in a certain direction, steering is difficult. Aquaplaning affects the handling of your vehicle, and it is especially important that you spend more time adjusting to it, especially if you are new to the experience.
If you are afraid of failure, you may feel compelled to get through the flood as quickly as possible. However, driving faster increases the risk of losing traction. Faster driving can also create a splash effect that can be distracted by other drivers defying in the opposite direction. In heavy rain, the use of headlamps and fog lights should be helpful in visibility problems.

Part 3: Stay Calm and Act Correctly in an Emergency
Even if you have a large vehicle, it does not take much depth or a strong current that things get acidic quickly. If you get stuck in a flooded area, stay in the vehicle and call for proper help.
If you try to get the car out yourself after it gets stuck, there is only a risk of more damage. Do not open the bonnet to fix anything. The engine compartment does not need to be exposed to much water to be damaged.
If the water level rises and you have to escape, the car doors may not be able to open. If so, roll or smash the windows and pull out yourself and other passengers as such. Help is available, and if you make sure you are properly insured in advance, you can cut down on flooded roads and other hazards.

Source:
http://www.eliancars.com/2019/01/how-to-drive-through-flooded-area.html#more
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Please read below

Lovely article.
Part 2 is very important..’Turning off the air condition’. The vehicle sucks in more air through the air filter compartment when the a/c is turned on, as against the amount of air needed without the a/c on. So, while driving through a flooded area..the engine(with a/c on), might suck in a lot of water, instead of air..(depending on the depth of the flood)...but, will suck in less when the a/c is off.
Ps; drive slowly..no full throttle!