Dozens of homes and farms south of Gaza City were inundated by flood waters overnight, Palestinian officials and witnesses said on Tuesday.
The rising waters flooded some 30 homes in Wadi Gaza, a farming area south of Gaza City mostly inhabited by Bedouins.
The flooding cut off roads linking Gaza City to the south of the impoverished territory for several hours.
Hamas announced on Tuesday that it will provide families affected by the recent flooding with shelter and immediate assistance, secretary general of the council Mahmoud Awad said in a statement.
The ministry will provide more than 100 families with shelter, Awad said.
Awad added that four ministers helped evacuate homes as the deluge swept across Gaza on Monday.
Civil defense forces evacuated tens of families from their homes in the valley town of Juhor Ad-Dik south of Gaza City, as floodwaters inundated the low-lying area and filled the streets.
At least 12 people were injured in the flooding, according to Dr Muawiya Hassanein, the head of Gaza emergency services.
Güncelleme Tarihi: 20 Ocak 2010, 17:27
Yussef al-Mansi, the housing and public works minister, said the government had declared a state of emergency in the area.
The infrastructure of the impoverished territory of 1.5 million people had been devasted by Israeli 22-day offensive into Gaza that has already been under years of siege.