Clonaslee first in Laois to get flood defences

Flood planning

Clonaslee first in Laois to get flood defences

Flood defences are to be built in Clonaslee, with Portarlington, Rathdowney, Mountmellick and Mountrath next in the queue.

Clonaslee has 42 homes and three businesses at risk from a hundred year flood, which means a 1 percent chance of floods every year.

The OPW’s preferred option includes removing weirs from the river Clodiagh.

“It has a good cost benefit analysis of 7, and the department has very nicely given us money for that one,” said Office of Public Works Project Engineer Gerry Gallagher, outlining the draft CFRAM six year plan at the September council meeting.

Public consultation for draft flood zone maps is over for Clonaslee residents, but councillors have until October 17.

In Portarlington, 102 residential properties are in the flood risk zone, and 42 non residential properties.

“The best option is a series of flood embankments and walls 1.6 metres high, over 3.3 km,” said the OPW engineer, adding that the CBA is 2.5, enough to warrant funding.

Rathdowney has 19 residences at risk. The river Erkina needs 7km of defences upstream, 1.5 metres high. The CBA there is 1.7.

In Mountmellick, 36 residential properties and five non residential are at risk.

The OPW plans a 1 metre high embankment beside 2.5km of the Owenass river, and raised roads. The CBA of 1.5m, meams the work will wait in line, as worst cases are being prioritised.

“I am not sure when it will get done, the first thing is to get the plan done. You as councillors have an opportunity to prioritise work,” the OPW engineer said.

Public consultation for Mountmellick ends on October 28, and on November 21 for councillors.

Mountrath has 23 residential properties and 6 non residential at risk. A 900 metre long flood defence, 1 metre high, and a new culvert built under Shannon Street are needed. However the cba is only .58, which may improve after a detailed survey.