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Basin at the 16th, Deganwy - light case study


The "Basin at the 16th" in Deganwy has delivered the first Welsh Water green infrastructure RainScape scheme in north Wales.

It is a large attenuation basin for managing stormwater generated through upstream surface water separation, retrofitted on previous scrubland, next to the 16th hole of a golf course. 

It is part of an overall national environment programme (NEP) being delivered by Welsh Water to reduce spills to the Afon Conwy estuary.

The design consists of an open planted attenuation basin sited immediately adjacent to the 16th hole of the Maesdu Golf Course.

The retrofitted basin is providing offline storage which is hydraulically controlled using a simple timber weir with a low flow slot in the adjacent watercourse.

Associated works included realigning a short section of the watercourse, providing new access bridges, and associated landscaping to reduce the amount of soil transported off site.

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