The causes of flooding in Trehafod during Storm Dennis two years ago have been revealed. The latest section 19 report investigating the flooding caused by Storm Dennis in 2020 said that a surcharging culvert inlet, located above the railway line, was the main source of flooding in the Pontypridd village.
A reported localised landslip is also considered to have contributed debris towards the culvert inlet and network reducing its capacity to manage the flow of water. The report said that the culvert inlet surcharged over the railway, onto the A4058 and towards Trehafod Road.
It also said that intense rainfall and localised surface water accumulation are also considered to have exacerbated the flooding in Trehafod – especially in those areas identified as high risk of surface water flooding in NRW’s (Natural Resources Wales) flood risk mapping. It said that extreme rainfall resulted in internal flooding to at least 68 properties (65 residential and three non-residential) and significant highway flooding locally. You can see the stark images showing the sheer devastation wrought by Storm Dennis two years ago here.
