Mud and water crushed the workmen's cabin

Three of the men suffered minor injuries and one a broken leg in the incident, which followed heavy rain and flooding near Llyn Ogwen, Bethesda.

Meanwhile across the rest of Wales, 28 flood warnings are currently in force.

Schools and roads have been closed and transport services disrupted because of heavy rain.

Emergency services were called to help the men swept away in the cabin as they had a teak break at around 1000 GMT on Tuesday.

"They were very lucky to get out alive," said their boss, Norman Richards of Gelli Civil Engineering.

Flooded properties

The men had been constructing a new car park on the side of the road near Llyn Ogwen when mud and water crashed about 50ft down the mountainside behind their cabin.

A horse is led to safety in Carmarthenshire

Meanwhile, a rescue boat was sent to six flooded terraced homes in the Riverside area of Pwllheli on Tuesday afternoon.

A mother and her two children, aged six and three, one asthmatic, asked to be evacuated after their home was six inches deep in water.

Elsewhere in north Wales, heavy rain has caused problems for drivers and householders.

Homes in Llangristiolus, Traeth Coch, near Benllech, Bethel, Amlwch, Llanerchymedd, Gaerwen, Rhostrehwfa, Rhosneigr and Menai Bridge have also been flooded.

Ten Gwynedd schools were closed because of rain overnight - most of them on the Lleyn Peninsula.

On the roads, the A499 at Penrhos near Pwllheli and the B4417 between Edern and Tudweiliog are shut and traffic from Botwnnog was being diverted through Nanhoron and Efailnewydd.

On Tuesday afternoon, trains were not running between Bangor and Holyhead because of a flooded track at Gaerwen in Anglesey, while the Conwy Valley branch line was blocked by floodwater south of Llanrwst.

Roads and schools were affected in north and mid Wales

Heavy rainfall also affected schools and roads in mid Wales - four secondary and three primary school in Ceredigion have been shut due to "severe weather".

The B4337 Talsarn to Cross Inn, near Lampeter, has been closed, as has the A40 at Llanwrdda, between Llandovery and Llandeilo.

The A475 at Drefach and the B4338 at Dolwen, also near Lampeter, were due to close later in the afternoon.

Secondary schools at Cardigan, Tregaron, Lampeter and Dyffryn Teifi in Llandysul had closed, while primary school closures included those at Tregroes, near Llandysul, Swyddffynnon, near Tregaron and Trefilan, near Lampeter.

Powys Council said that Nantmel Primary School, near Llandrindod Wells, will be closed on Wednesday for repairs on a culvert after it overflowed on Tuesday.