Sustainable drainage in planning
As the Lead Local Flood Authority (LLFA) we can give you information and advice if you are preparing a planning application.
Sustainable drainage systems (SuDS) aim to manage rainwater runoff in a natural way by replicating natural processes.
Examples of SuDS provisions include:
- green roofs
- permeable pavement and underground storage
- shallow ditches or swales
For advice or information email SuDS@kent.gov.uk.
We charge for our pre-application advice on surface water drainage management for most major developments. Please see our free standing advice guidance on incorporating sustainable drainage into minor and low risk development .
Advice for county planning and highways matters are also chargeable.
Our advice can:
- indicate whether a drainage proposal would be unacceptable, saving you the cost of applying formally
- reduce the time your advisers spend on developing a drainage strategy
- ensure your drainage submission is complete so it doesn't get rejected in the early stages
- let you know how guidance and policies will be applied to your development
- identify whether you need specialist input.
Advice on forms
Call 03000 41 41 41 or email email@example.com for free, informal advice on the forms you need.
Download our pre application advice guidance (PDF, 406.0 KB) for further information.
To apply for chargeable planning advice please complete our flooding and drainage pre-application advice form.
All fees include VAT.
- Written advice for a general site enquiry or flood risk assessment enquiry - £240
- Meeting at County Hall - £360
- Meeting on site - £480
- Further written advice after meetings - £180
- Any additional correspondence (price upon application as it depends upon complexity of request)
Download our full drainage planning fees (PDF, 233.3 KB).
Read the full guidance for master planning sustainable drainage into developments (PDF, 4.5 MB), or choose which section you would like to read:
- Part 1 - our vision (PDF, 366.3 KB)
- Part 2 - setting the scene in the South East (PDF, 471.1 KB)
- Part 3 - designing SuDS to deliver benefits (PDF, 1.1 MB)
- Part 4 - designing SuDS to respond to common site conditions (PDF, 467.8 KB)
- Part 5 - the master planning process (PDF, 249.5 KB)
- Part 6 - considering SuDS through the master planning process (PDF, 577.5 KB)
- Part 7 - demonstration typologies (PDF, 2.6 MB)
- Part 8 - Further information and guidance for detailed design (PDF, 265.5 KB)
Our surface water management plans should also be referred to during the formulation of a drainage strategy for a site.
Land drainage consents
Any feature on site that is not an Environment Agency designated ‘main river’ that is capable of conveying flow would be classified as an ‘ordinary watercourse’ (such as ditches, dykes and streams). Any works within the channel of any such feature would require our formal written consent.
If any part of a development or its associated drainage system involves works to an existing ordinary watercourse, please see our guidance on land drainage consent.
Statutory consultee role
Find out more about our statutory role to provide technical advice and guidance on the surface water drainage strategies, designs and maintenance arrangements put forward by developers for any new major development through our statutory role.
The provision of sustainable drainage within new development became a material consideration in planning decisions from 15 April 2015.
As Lead Local Flood Authority and statutory consultee, we review drainage strategies and surface water management provisions associated with major development. This means that we must be consulted by each of the Kent's 12 local planning authorities whenever they receive an application for major development (PDF, 93.1 KB) within their district.
Read our sustainable drainage chapter of the 'Making it Happen - Kent Design Guide (PDF, 2.8 MB)' (chapter 2). The design guides sets the standards and provide detailed design details for drainage systems which are adopted by us, specifically those associated with highways.
Not all planning applications require detailed information. Some forms of development would be considered to be relatively ‘low risk’ provided it can comply with our following standing advice:
- agricultural buildings and equestrian facilities
- caravans and holiday parks
For further information about standing advice, please email firstname.lastname@example.org.