Site Wide Foul Water Drainage Upgrade
Civilistix Consulting Engineers were appointed to undertake a full review and upgrade of the existing foul water drainage system on this 3.60ha brownfield site.
The existing foul drainage system discharged to a drainage field which took a significant portion of land to operate and did not always infiltrate, sometimes leaving effluent at surface level.
We initially liaised with the Environment Agency (EA) to seek discharge agreement to a nearby watercourse. As part of this process, we prepared a report identifying why it was not feasible to connect to the public sewer (the EA’s preference). Our report highlighted this was due to unproportionate cost, system adoption and Highway construction concerns.
We calculated the existing site wide flow rates entering each part of the system including an allowance for future growth. This allowed us to identify where existing pipes were over capacity and needed upgrade as well as to hydraulically design and specify new portions of the system to make it compatible with a watercourse connection.
Our full schedule of upgrades included replacement and upgrade of existing pipes, proposed pipe runs, design of a proposed pump station and rising mains and a proposed Klargester Bio-disc treatment plant with a 20m3 daily capacity as well as installation of the headwall.
We obtained discharge consent for the watercourse connection from Old West IDB and we crossed the public highway EA and obtained highway approval for the private pipe crossing works as well as full Building Control sign-off. We acted as CDM Principle Designer throughout the project and upon completing full detailed design and approvals we fully tendered, awarded the contract and managed the contract administration of the JCT contract the works was procured under.