Met Éireann has warned of further flooding after issuing a Status Yellow rain warning for counties Carlow, Kilkenny, Wexford, Cork, Waterford, Dublin, Louth, Wicklow for tomorrow.
The forecaster said that further heavy rain falling on saturated ground, combined with high river levels and high tides, will lead to localised flooding, river flooding and difficult travel conditions.
The warning for Carlow, Kilkenny, Wexford, Cork, Waterford is valid from 6pm tomorrow until midday on Tuesday.
The warning for Dublin, Louth, Wicklow comes into effect from 3am until 6pm on Tuesday.
Meanwhile, a Yellow ice warning has been issued by the UK Met Office for Antrim, Armagh, Down, Fermanagh, Tyrone, Derry.
The warning came into force at 7pm and will remain in place until 9am tomorrow.
The forecaster is advising that icy patches may form on untreated surfaces during tonight into tomorrow morning.
Met Éireann has said that spells of heavy and persistent rainfall will continue through the week, particularly in southern and eastern coastal counties.
It said that rain will fall on saturated ground where river levels are high with high tides expected this week.
This will lead to further flooding along rivers and in coastal areas.
Flooding expected to affect counties in Leinster and Ulster
Speaking to RTÉ News, Keith Leonard of the the National Emergency Coordination Group said the flooding could affect many counties: "Wexford, Wicklow, Kilkenny, Carlow in particular, but also even Monaghan and Cavan. And across the eastern region, we're looking at the water level, so really quite high across all those areas.
He said preparations were being made and that local authorities "again, remain on full alert".
"They have outdoor crews fully deployed. Fire services and emergency services are on standby, and local authorities are also arranging for mutual support from other local authorities that are less affected this weekend to be there to fully support a response across next week."
He promised sandbags will be available to those who need them: "Wexford [County Council] filled 15,000 sandbags over the course of the last week, and are doing more and distributing more.
"And local authorities right across each region now are making sandbags available to locals in those pinch points where flooding will be effective, and they're also conducting pumping operations where it's possible to do so to try and anticipate flooding."
He advised people in high risk areas to keep informed about warnings from Local Authorities and from Met Éireann.
"Just keep in touch with your weather forecast, your updates from your local authorities, and if you experience flooding, or you have any threat of flooding, ring 999, and you'll get the assistance, both from fire services, Coast Guard and the emergency services."
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Wexford
In Wexford, one of the counties worst-affected by flooding earlier in the week, the County Council said that "The Slaney and many other rivers remain full" and that it is "ready to respond to incidents as they occur".
"Sandbags have been deployed where needed and our crews are constantly monitoring the river levels and other areas of increased risk of flooding.
"Members of the public are reminded that continued vigilance is needed on all roads in the county and do not enter flooded areas."
Cork city
Minor flooding is expected on low-lying quays in Cork city centre over the next 48 hours.
Cork City Council is predicting surface water on a number of low-lying city centre quays with scheduled high tides set to coincide with a forecasted tidal storm surge at 5.45am and 6.04pm tomorrow, Monday, and at 6.29am and 6.46pm on Tuesday.
Quays most likely to be affected at these times will be Wandesford Quay, Lavitts Quay, Union Quay and Kyrl's Quay.
The council says it has crews on standby across the bank holiday weekend with lane restrictions or road closures to be introduced as required in affected areas.
Pedestrians are being advised to exercise care during these high tide times. Motorists are being warned about parking in the areas most likely to be affected by the high-tide surface flooding, to drive with care, and to allow time for potential traffic diversions or delays in the city centre.
Waterford
Waterford City and County Council said its ground crews have been working overnight and will continue working today and over the coming days to alleviate flooding, clean up in its aftermath, and prepare for the risk of further flooding.
It advised the public to continue to exercise caution, heed public safety advice and avoid unnecessary journeys as driving conditions may be hazardous, as surface water remains on many routes.
Avoid driving through flowing or standing water and if the road ahead is flooded, do not enter, turn around and find another route. Motorists are also reminded to be conscious of vulnerable road users such as pedestrians and cyclists.
'Decisions need to be made quickly' - Harris
Tánaiste Simon Harris has said there is a significant chance of further flooding in the coming days, "particularly Monday through to Wednesday ... in the south-east and up to the east".
Mr Harris said: "we must continue to do everything that can be done in the here and now to assist people, businesses and communities impacted by flooding, including the enhanced supports we have put in place for businesses to provide them with financial assistance".
He also said further examination was needed to establish "what more can be done to assist with short-term solutions that can provide greater protection and resilience in communities".
"Decisions need to be made on this quickly. I know Minister Kevin 'Boxer' Moran is determined to do this," he added.
The Tánaiste said it was "absolutely essential that flood relief schemes are classified as critical infrastructure" and that the Government legislate "to help speed up and accelerate their delivery".
