And with more rain forecast for the middle of the week, there may be worse to come.
Many areas will have some respite from rain on Monday, but the crisis looks set to continue as more bad weather sweeps in.
The Met Office has issued yellow warnings for rain and wind on Wednesday.
Rain is set to batter Lancashire again with up to three inches, 80mm, falling on high ground and potentially in excess of 4.7ins, 120mm, in exposed locations - with most places seeing up to 1.5ins, 40mm.
Gusts of up to 70mph are also predicted.
The Government has vowed to look again at the quality of the UK’s flood defences as home and business owners face up to a miserable start to the new year.
Emergency financial assistance will also be put in place for affected areas, and homes and businesses damaged by flooding will have access to the same package of support announced for those affected by Storm Desmond.
Mr Cameron praised the efforts of the emergency services and said that with the prevalence of such extreme weather events on the rise, investment in flood defences would continue.
Shadow environment secretary Kerry McCarthy said the Government must “drop its complacency” over the need for climate change adaptation.