The worst hit was the Asparuhovo neighbourhood of the Black Sea port city of Varna, where at least 11 people including two children perished, local authorities said.
A seven-year-old child, who said he was with his sister and grandmother when the disaster hit, was rescued and taken to hospital.
Three more victims drowned in the nearby northeastern town of Dobrich and 150 people were evacuated from the lowest part of the town where the water level remained waist-high on this evening, an AFP photographer said.
Many Ukrainian children meanwhile remained blocked in their hotel in the village of Kranevo.
Dozens of smashed and piled up cars and uprooted trees littered the narrow mud-splattered streets of the worst-hit Varna neighbourhood of Asparuhovo today, leaving parts of the area still impassable.
The normally picturesque hillside quarter was submerged after torrential rain pounded the region last evening, clogging garbage-filled drainage canals and turning the steep streets into raging torrents.
Many rickety houses were totally destroyed by the water and authorities were unable to say whether their owners had survived even if they found no new victims buried under the ruins.
Navy divers continued to search a canal linking Lake Varna to the Black Sea, where all the floodwater drained away, dragging with it cars, furniture, garbage and uprooted trees. Two bodies were recovered from the waters.
Soldiers and 40 prisoners helped to evacuate people throughout the day and clean up the piles of mud and garbage from the streets of Asparuhovo.
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