During a special sitting of the regional development committee yesterday its chair Jimmy Spratt said a report by Belfast City Council had pointed to shortcomings in the emergency response.
Sarah Venning of NI Water told members that the rainfall had been exceptional.
She added that 58mm of rain had fallen within a few hours in Castlereagh on the day in question — more than the month of May.
“Our pumps and equipment operated continuously throughout the event, they just could not move the amount of water presented to them,” she said.
Colin Sykes from Roads Service apologised but said resources were “primarily deployed to roads-related flooding”.
A full multi-agency review into the flooding is still ongoing.
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