I saw lot of flood and water which is destroying...

Praise is to Allah. We seek refuge in Him. He is not misguided. He who is guided by Allah no one shall mislead him. And no one shall guide a misleading person. I testify that there is no god but Allah, who has no partner and that Muhammad is His servant and His Messenger.
My honorable customer,
The sea flood or roaring “Tsunami” means the bad and unfair sultan as Allah SWT said “We, when the water (of Noah's Flood) overflowed beyond its limits, carried you (mankind), in the floating (Ark)”. So Allah called the flood as despotism as it cross the sea normal limits. And so on the despotism and oppression sultan or governor. The sea flood may indicates to troubles that will change the life of people from the religion side. But if you helped a girl and protect her from Tsunami then you may be in the safe side and that you will help others to be away from these troubles and spell and oppression.
I ask Allah to guide you to what He loves and pleases, and to go beyond the evils of your deeds and to enter us and you in His mercy.
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Kind Regards,

If the flood did not include you and take you then inshaAllah you will be safe as it was around you, however it means in your dream that a lot of problems and hardship will come to the area were the flood came to it, and that is why you should be in safe side which being close to Allah and make dua so Allah will protect you from this distruction.
And Allah knows best