The clean-up has started for flood-plagued residents across the North West.
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Heavy and persistent rainfall made driving conditions hazardous on Wednesday night, and put a number of homes at risk of damage from the rising and often contaminated water.
The tiny Co Tyrone village of Magheramason was just one of the areas badly affected.
The water started to creep into properties by 6pm as debris washed down the streets blocking storm drains.
One resident in the small cull-de-sac of Wallace Heights returned to her home after heart surgery to find it starting to flood, causing her floors to lift.
Another elderly cancer sufferer was left stranded with no heating.
In Londonderry, the main road to Letterkenny flooded and traffic sent water surging towards nearby houses.
Residents took drastic action, blocking the road and refusing to let cars through.
One woman told UTV: "We felt totally, totally abandoned by the authorities. We had to take the situation into our own hands.
"We actually had to go out as residents and block the road last night."
A statement from Northern Ireland Water said: "Staff and contractors have been mobilised to those areas affected and are assisting the other agencies involved."
© UTV News