The accident and emergency department at Bassetlaw hospital is partially flooded following torrential rain and flash flooding overnight in Worksop.
The hospital has asked people not to visit unless their condition is urgent or life-threatening.
Around twice the average monthly rain fell in just three hours in the town on August 16.
At least 30 homes and business premises were affected, a rest centre was put on standby and an eight-foot-wide sinkhole appeared in the car park of Matalan in the town centre. A tree was also reported to have fallen in Carlton Road.
The extreme wet weather following weeks of record high temperatures during two heatwaves has led to disruption across other parts of Nottinghamshire – inclduding to trains and buses.
Rob Fisher, Group Manager for Emergency Planning at Nottinghamshire County Council, told the Local Democracy Reporting Service the water was receding as of midday.
He said: “This is the sort of risk that we see at this time of year after a long period of dry weather.
“What we’ve seen in Worksop is surface water flooding. Periods of sudden very intense rainfall can happen anywhere.
“Nottinghamshire police were advising some residents to evacuate their homes but from our point of view we had Worksop Leisure Centre set up as a potential rest centre.
“The water quickly receded. Today county council staff are in Worksop going from door-to-door to see which properties were flooded internally.”
Stagecoach East Midlands, which reported flooding at its depot, is also not operating a number of services between Worksop, Doncaster, Rotherham and Chesterfield today (August 17).
Worksop Town Football Club has also postponed its match against Sheffield Football Club this evening.
The Environment Agency has also issued a flood alert for the Ryton Oldcotes area, where there have been “localised thunderstorms”.
The alert, which will be in place until August 18, said: “Given the unpredictable nature of thunderstorms, there is low confidence in the exact locations, timings and impacts of rainfall at this point.
“Areas most at risk are low lying agricultural land, roads and footpaths close to small rivers and streams. Water levels could rise rapidly and potentially generate deep, fast flows. We are closely monitoring the situation.”
Nottinghamshire County Council’s Cabinet Member for Transport and Environment, Neil Clarke (Con) added: “We know from experience in Nottinghamshire how devastating flooding can be.
“They opened Worksop Leisure Centre as a refuge centre but apparently only a handful, not many people, had taken advantage of it.
“A leisure centre is there as a last resort emergency but you’ve got to be prepared to offer the service to the community.”
Cabinet Member for Neighbourhoods at Bassetlaw District Council, Councillor Julie Leigh added: “We are working with our partners to support residents and business affected by last night’s flooding.
“Our Housing Team are carrying out inspections across Sandy Lane today and other affected areas and have started work on a number of repairs, whilst Environment Services can provide skips for disposal of flood damaged items.
“Our street sweepers are clearing the roads and streets in the worst affected areas as we deal with a significant amount of debris caused by the run off from the flooding.”
People are asked to report any hazards relating to the highways on 0300 500 80 80.
Residents whose homes have been affected and require a skip for the disposal of flood damaged items should call Bassetlaw District Council on 01909 533 533.