A major project to tackle flooding in Llanelli is underway.
Welsh Water's RainScape scheme involves a large tunnel being dug under the town to take rainwater away from the sewer network.
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Stebonheath Primary School became involved in the scheme at the start.
The school's grounds were excavated to allow water to be stored underground, while water butts and vegetation were installed on the surface to capture more surface water.
Since the school is situated on top of a hill, the modifications mean less water is now allowed to flow into the town of Llanelli itself.
A giant machine is at work underneath the Llanelli, driving a tunnel 1km long to send surface water to the Delta Lakes.
This tunnel, along with additional greenery and swales in the town, helps stop the sewer system from being overwhelmed during heavy rain.
In Cardiff, the Greener Grangetown scheme is nearing completion.
The project also aims to reduce the surface water running into the sewer network, diverting to the River Taff instead.
The disruption caused by the work has frustrated some residents, but the people behind the scheme say the environmental benefits will make it worthwhile.