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SuDSmart Design

Detailed Drainage Design for sustainable drainage systems

Detailed Drainage Design from £1,495+VAT

Calculations and design drawings for drainage systems. Suitable for planning applications and development.

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What does it solve?

Planning applications often require that developers construct sustainable drainage. The first step is to complete a sustainable drainage strategy (via one of our SuDs reports) that evaluates which options are available for the drainage including discharge to a watercourse or sewer and where there are favourable ground conditions, infiltration using soakaways. Building on this, a Detailed Drainage Design provides calculations and drawings that shows what to build where to satisfy the agreed drainage strategy.

 

Our Detailed Drainage Report provides in-depth details including pipe dimensions, cover and invert levels and gradients.

This product is ideal to bundle with one of our SuDs reports which will provide the drainage strategy for the detailed design to based upon.

Check out our FAQs and video FAQs below for more details.

We can also supply a SuDs report.

 

Download an Example Report

Example Report

Delivery and Turnaround
  • Typically 15 working days
  • Premium delivery option is available if report is urgent
  • Report will be sent in electronic format as a .pdf file straight to your inbox
  • Hard copies available at an additional cost
Technical Information
  • Calculations of greenfield runoff rates
  • Calculations of storage requirements with climate change allowance, either with or without infiltration
  • Modelling of proposed system to demonstrate compliance with requirements of LLFA and discharge rate
  • Detailed drawing showing layout of proposed drainage system including cover levels, invert levels and pipe sizes, gradients and lengths
  • Schedules detailing pipes and manholes
  • Construction details if required (POA)
Benefits
  • Produced by specialist hydrologists with over 15 years experience
  • One single report meets the needs of both planning officers and builders
  • Our consultants have built a great working relationship with the Environment Agency, SuDS Approval Bodies (SABs) and Local Authority Officers across the UK
  • Quick turnaround options available
  • Low cost / fixed price
Features
  • Concise report
  • Compliments a SuDs report
  • Features all relevant calculations
  • Clear recommendations are made
Assumptions
  • A topographical survey of the site is available in .dwg format
  • A site layout available in .dwg
  • Locations of foul and rain water down pipes
  • Proposed levels
  • A proposed drainage strategy from a SuDS report
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FAQs

Re drainage how do I get planning permission?

Planning applications need to demonstrate that impacts to the environment, both on site and in the vicinity, have been considered.

Sustainable drainage design is viewed favourably and can unlock a site through control of the quantity and the quality of the discharge.

If you intend to develop property or land, a detailed drainage design will inform your builders (or perhaps yourself) to know what drainage to build, where. The design has to consider all relevant guidance, such as from the council and SuDS manual and demonstrate a reduction in discharge rate where required.

 

What are planners looking for re drainage on a development site?

Fundamentally planners are interested in reducing the impact your development will have on the environment – both on your site and the local vicinity. Sustainable drainage design is viewed favourably and some of the issues planners are interested in include:

  • What is the quantity of the discharge from the site? Flood risk is a key concern – both on the site and further afield.
  • What is the destination of the discharge, where will you send it?
  • What are the discharge rates locally permitted for greenfield development?
  • If your site is a brownfield development – how will you improve the environment
Why do I need a Detailed Drainage Design?

Every project is different and therefore the drainage design is unique. In some cases, planners may require a significant level of detail to ensure the feasibility of the design and drawings are used by the regulators to ensure the approved scheme is installed correctly. Sustainable drainage is viewed favourably and can unlock planning permission for a difficult site.

If you intend to build a house, or any kind of development, you will need a detailed drainage design in order for your builders (or perhaps yourself) to know what drainage to install. The design has to consider all relevant guidance, from the Local Authority, DEFRA and best practice from the SuDS manual (CIRIA, 2015) and demonstrate a reduction in discharge rate where required.

Every project is unique and so every project’s drainage design is unique. Every site has different topography, (site levels and slopes) and ground conditions. Some projects may need to discharge to a watercourse but others to sewers. Some projects may have very favourable ground conditions and infiltration is feasible.

Planners need to be confident that the design has considered all of these factors and that the development has met their criteria for sustainable drainage.

What is the difference between a drainage strategy and a Detailed Drainage Design?

A drainage strategy considers all options for sustainable drainage and advises on the most likely solution and incorporates an outline strategy. This will include attenuation volume required, a proposed discharge rate or an infiltration rate.

Some local authorities require more detail and therefore a ‘detailed drainage design’ is required with a planning condition. This design gives a lot more detail such as gradients and sizes of pipes, cover and invert levels.

A detailed drainage design is often thought of as the engineering drawings and technicalities of how the system will work for a proposed SuDS scheme.

How do I reduce the discharge flow rate from my site?

Developments should demonstrate that they will not increase the risk of flooding on site or in the local area. This can be achieved by storing rainfall on site and then restricting the flow off site to replicate what would have happened before anything was constructed. A Detailed Design Drainage gives all the technical details for how this is achieved and where on the site the infrastructure should be placed.

 

 

Need a SuDS Report?

Take a look at our comprehensive range of SuDS reports.

SuDs Reports

Video FAQs

What is sustainable drainage?

What are planners looking for re drainage on a development site?

Why do you need a Detailed Drainage Design?

What is the difference between a drainage strategy and a Detailed Drainage Design?

How to reduce the the discharge flow rate from your site

See what our customers have to say...

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