Foul Water Drainage Design

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Foul Water Drainage Design

Foul water is any wastewater coming from toilets, urinals, sinks, showers, baths, dishwashers and washing machines. This foul water is then discharged appropriately into the foul or combined sewage network, a water drainage design that eventually conveys the foul water into treatment plants.


In rural areas where there is no wastewater network in the vicinity of the site, the foul water drainage from any proposed development can be conveyed into a septic tank or small wastewater treatment tank. Through this foul water drainage design, water is discharged either into the ground in a drainage field, or for the latter, into a nearby ditch or watercourse. However, consultation with the Environment Agency may be required in order to confirm the discharge requirements for this.


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The Importance of foul water drainage design


Foul water drainage design must be tailored to any new development and planning a foul drainage system requires an assessment of the requirements of the site, the location and depth of the local foul sewage network, and the expected peak foul flow from the development that needs to be conveyed to this.


During this assessment, we will always endeavour to look for cost-effective gravity lead solutions, however, in instances where discharge by gravity is not feasible, we can liaise with pump suppliers in order to provide a workable solution.


We can also work with the relevant water authorities to design sewer diversions and obtain the necessary agreements for these, as well as sewer build over agreements where required.


Experts In Foul Water Drainage Design

We provide a fully comprehensive below ground foul water drainage design service, for small to large commercial, industrial and residential developments. Working closely with our clients to produce the most cost-effective and workable solution for their foul water drainage strategy provides the best results for them and the environment.

Our expert staff are always on hand to provide guidance from the inception of the project, right through to construction, as well as providing maintenance advice.

All of our designs are produced in accordance with Part H of the building regulations, Sewers for Adoption (8th Edition), or Sewers for Scotland (4th Edition).

If you would like more information on our drainage design services or would like to obtain a quote, then please do not hesitate to contact us at




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“I have really enjoyed working with Nimbus. Sadia is extremely knowledgeable and is always willing to go out to her way to help clients. The speed at which Nimbus produce their work is impressive and the prices are extremely competitive. Special mention to Ryan Herity after we worked closely together on a couple of schemes. Always happy to pick up the phone and answer questions. He provided solutions that led to drainage officer approvals – you can’t ask any more than that!”
John Neville
Elegant Homes
“I have used Nimbus Engineering Consultants for several years now. The service is second to none. Sadia effectively communicates throughout the entire process. Nimbus has never let me down. I would wholeheartedly recommend Nimbus for any and all SuDS advice. Nimbus shoot from the hip, and make my life easy, knowing if I have engaged them, I do not have to ever worry.”
Design Doctor
“We’ve collaborated with Sadia on a few projects; Nimbus Engineering’s proposals were well-informed, attentive of regulatory trends and wrapped in proactive attitude.”
Yasmina Mikhael
RES Design Long & Partners
We have been working with Nimbus Engineering for some time in a collaborative approach, allowing us to provide our clients with a complete Engineering service. Primarily providing us with SuDs, foul and surface water design, along with highways design and detailing, Nimbus have given us a great service, both prompt and efficient.
Daniel Fordham
Fordham Consulting
We at Rouf Homes have been using Nimbus Engineering for a number of years, for all matters relating to Drainage design, Flood risk and Sustainable Urban Drainage Systems design. We find them to be very knowledgeable on these matters, approachable, efficient and very cost effective
Belal Rouf
Rouf Homes
Richardson and Peat Ltd are pleased to be associated with Nimbus Engineering for their work on our Surrey school projects for new autistic teaching centres, with exemplary forward-thinking on the issues facing us with surface water attenuation they have not only dealt with the problems cost-effectively but by detailed design of rainwater gardens and swales have also enhanced the projects. Our company look forward to a continuing working relationship with Nimbus Engineering in the future.
Martin Peat
Richardson Peat


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