Cambria Consulting were appointed Civil and Structural Engineers for the first phase of the Cardiff Living Development Partnership between Cardiff Council and Wates Residential. The Willowbrook West site is the largest of the Phase 1 developments, delivering 192 new residential units on a greenfield site in St Mellons.
The site presented a number of challenges; with a section of the southern area of the site designated in a flood zone, there are a number of watercourses & reens along the site’s boundaries, numerous PROW routes traverse the site, and there are a number of mature tree lines. To allow development, Cambria obtained several ordinary watercourse consents to divert and culvert the watercourses to enable both permanent and temporary access routes into the site. A S247 Stopping up Order was obtained from WAG for the existing highway land on the site, which was no longer used, and the PROW routes were diverted via a S257 agreement to align with the new proposed street layouts.
Cambria designed all the Sustainable Drainage Systems (SuDS) which were incorporated into the surface water drainage scheme, the run-off from the site being restricted to the QBar Greenfield run-off rate with all attenuation provided by a pond and wetland area in the southern corner of the site. A pond dipping deck and soft landscaping have ensured that the pond also provides amenity and biodiversity benefits to the development. Cambria also secured all the required S38 Agreements, S104 Drainage Agreements from the Local Highway Authority and Welsh Water respectively.