Bidwell West Urban Extension
Civil Engineering and Road Construction
- 19,000m2 of new distributor roads
- 3km of onsite storm drainage
- Four attenuation basins – 26,000m3
- 3km of onsite foul drainage
- Foul pumping station and rising main
- 2km of a strategic offsite storm and foul
- 200m of 3mx3m RC Box Culverts
- 112,000 m3 of bulk earthworks
- Two new offsite roundabouts
- 15km of new service mains
- 5,000 m2 of off-site Section 278 carriageway upgrade
- Three substations including all superstructure works
In mid-2018 we was contracted by Bidwell Land Ownership Group, a consortium of local landowners, to deliver the strategic Infrastructure and section 278 works necessary to develop the 166 hectare site which will eventually accommodate nearly 2000 new homes.
The strategic Infrastructure and section 278 works commenced in the summer of 2018 with over 100,000m3 of bulk earthworks which proceed the installation of Phase 1, 2, 3 & 4 of the onsite works. These phases included over 6km of strategic storm and foul along with 19,000m2 of new carriageway. To facilitate the disposal of the foul sewage, a 7m deep in-situ pumping station was constructed, with an oversized wet-well and 300m of foul rising main connecting into the existing Houghton Regis trunk main.
The sustainably designed SUDS systems made best use of the existing watercourses that traversed the site. To tie-in the new drainage and road network, over 1,200 tonnes of pre-cast box culvert was installed along with 21 in-situ headwalls.
The Section 278 work was split into six phases, all of which involved removal and upgrade of the existing Thorn Road, whilst maintaining access for residents and developers. The installation of 2km of off-site drainage was carefully undertaken alongside a live HV cable – this work was meticulously planned to avoid incident.