Drainage Design

The drainage of a development is very rarely seen or thought about by people when looking at a new development which has been constructed. However the drainage designed and installed underground or on the surface as part of surface features is an important and integral part of the design and layout of developments in terms of both dealing with the anticipated flows from a new development, but also ensuring the development does not contribute to increased flood risk to the site itself or other sites in the vicinity.

Design of drainage for a new development or re-development of a current site form a very important part of the site strategy and are closely linked to flood risk. Indeed, some flood risk mitigation measures directly affect the type and design of proposed drainage systems.

From assessment of existing drainage infrastructure on a site to obtain current run-off rates, Greenfield and Agricultural run off rate calculations and preliminary drainage strategies through to final detailed design of attenuation and Sustainable Urban Drainage Systems (SuDS) can have a major impact on the development proposed and the layouts and viability of such developments.

It is important from an early stage in any development that drainage is considered and impact dealt with to ensure the site development encompasses all the requirements necessary to meet with the required standards and constraints to meet planning requirements. This is often required to be materially considered as part of a Planning Application.

Drainage can form simple private systems connecting into existing adopted sewers but can also form large adopted systems with integrated SuDS structures to control and manage run off rates from proposed development sites.

Other important considerations which must be borne in mind at the initial stages of development are identifying viable points of discharge from the site for both foul and surface water and acceptable rates of discharge. These can be absolutely critical to the development viability and layout.

Whilst for some Outline Planning Applications a full detailed design for the drainage is not required, the viability of the development to be drained adequately is required to be proven as part of the Outline Planning process.

For Full Planning Applications and reserved matters (discharging planning conditions on a valid planning permission) a full drainage design is required to ensure that the site can be drained adequately and meet the requirements of the Planning Conditions imposed. This usually involves construction drawings and full hydraulic calculations to support the design and drawings.

Sanderson Associates Drainage Design Services.

Sanderson Associates provide a comprehensive drainage design service which include assessment of existing drainage infrastructure through to design of new systems including attenuation and other forms of SuDS to adoptable standards for development.

Sanderson Associates have undertaken many and varied types of drainage design from preliminary assessments for small developments through to full detailed design and adoption through S104 agreements for large employment and residential developments.

Our drainage design service offers valuable advice to clients on the most cost effective and viable solutions to drainage problems and options available including sustainable systems.

Our drainage expertise also follows through into our Flood Risk Assessment Services which ensures that any drainage or flood risk mitigation measures recommended as part of a Flood Risk Assessment are best value design and bespoke to any such development. Please visit our dedicated flood risk site www.floodrisk.co.uk for further information on our flood risk services and expertise.


What Our Clients Say:

Transport Assessment, Proposed Residential Development (170 dwellings), Essex

Fri 24 April 2020

This report is of the highest quality and detail and draws the conclusions we had hoped to see. Thanks to you and the team for this, we will certainly be using Sanderson Associates on future projects. Tom Helliwell, Managing Director, Class Q Ltd

Speed Survey, Proposed Private Residential Development – Testimonial

Sat 14 December 2019

Thank you so much for your fast and efficient service, the speed survey was conducted efficiently and the report given has really helped our planning application process with highways moving forward. Communication from yourselves was also fantastic and swift. Would most definitely recommend you to everyone. Much appreciated! Ismail Chopdat (Private Individual)

Access Feasibility Study, Proposed Private Residential Development – Testimonial

Mon 30 September 2019

I have recently worked on a project with Karen and Ashley at Sanderson’s and they were extremely helpful, professional and worked to my extremely tight deadline. I have no hesitation in recommending this company their attention to detail and professionalism was much appreciated. Rosie Marsh (Private Individual)

Analysis of Speed Survey and Swept Path Analysis

Tue 3 September 2019

Brett and the Sanderson’s team were invaluable to us in obtaining highways consent which in part cleared the way for our planning application to be approved. They provided a proactive professional and personable approach to satisfy and fulfil the Cambridgeshire highways requirements. We recommend them and will use them again. Daykin Waters Waters Developments

Stage 2 Road Safety Audit, Residential, Staffordshire

Tue 16 July 2019

Sanderson Associates were the successful bidder for carrying out a Stage 2 Road Safety Audit on behalf of TSP Projects. Their team were committed to the tight programme, and not only did they undertake the audit and agree terms and conditions in a short space of time they were receptive and flexible with planning the […]

Construction Traffic Management Plan

Mon 15 April 2019

Sanderson Associates have been very helpful for us and our clients. They proved efficiency and competitive pricing. Thank you for your services. Andreea Raicu, Architect, Tang & Associates Ltd

Flood Risk Assessment, Testimonial, Industrial Development, Sheffield

Tue 19 March 2019

Sanderson’s were a great in helping us with our planning application for a new material silo at our manufacturing base in Sheffield. Darren was efficient and swift in his discussions with the council on the need for a flood risk assessment on the site. Darren’s knowledge of the site and surrounding area and consequent discussions […]

Travel Plan

Wed 21 November 2018

We have worked with Ashley, found the service very professional, efficient and cost-effective. We received the surveys and reports on time and were kept fully appraised with everything, excellent service all round. Recommend using Sanderson again in the future. Thank you, Al Ihsan Trust

Access Appraisal in Support of the Reinstatement of Access to a Residential Dwelling

Tue 7 August 2018

Brett, I would just like to pass on my personal thanks for the assistance you offered us in our planning application to reinstate an unused driveway into our renovation property. From the initial contact with the office staff, through the quote and the carrying out of the road survey, drawings, and associated work through to […]

Highway Technical Letter in Support of Residential Development – Testimonial

Thu 25 January 2018

Excellent service, very professional and enabled a very positive response back to the Highways Agency with a site plan we were having difficulties with. I’d highly recommend Sanderson’s. Peter Wilson, Individual

Require Assistance with Drainage Design?

Sanderson Associates have enjoyed over 33 years in business, our experienced Drainage Design engineers have produced designs for a variety of developments throughout the UK, Isle of Man and Ireland.

We would be pleased to provide you with our competitive fee proposal to provide you with our Drainage Design Services, please call us on 01924 844080 or click here to complete our secure online form.

Drainage Design, Run off Rates, Sustainable Urban Drainage Systems
SuDS, Adopted Sewers, Foul Water, Surface Water, Rates of Discharge
Outline Planning Process, Construction Drawings, Hydraulic Calculations
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