To do this, it is necessary to officially record the flooding by contacting ZHEK or another operating organization, on the balance of which the building is serviced, and draw up an act on the flooding of the apartment. The act describes the cause and all consequences of the flooding: what was flooded, what things were damaged, what amount of work needs to be done, etc. The completed act will be the main document confirming the fact in the event of an appeal to the court, if the dispute cannot be resolved by amicable agreement.
For additional recording, you can use a camera or video camera, you can also involve witnesses. Tip: You should not rush to make repairs, because it may be necessary to conduct an examination to determine the actual damage. If you did make the repair, keep documentary evidence of the costs for its implementation, in particular, the act of the work performed by the organization that eliminated the consequences of the flooding, as well as the receipt for payment for this work.
In the event that the flooding caused damage to health - and this is possible, especially in the case of hot water - it is necessary to consult a doctor and also take the appropriate certificate of application.