TEL: 07961 477330

We provide the following drainage services:


•Detailed Drainage Design

•Modelling of Existing and Proposed Drainage Systems

•Section 104 (Adoptable Systems) 

•Section 185 (Sewer Diversions)

•Percolation Testing (BRE Digest 365)

•Attenuation Sizing  

•Soakaway Sizing 

•Flood Defence Consent 

•Environmental Permitting  

•Foul Drainage 

Have you had planning refused because you require a SUDS Surface Water drainage design similar to the ones below?


'Prior to first occupation of the development hereby approved, a surface water system that demonstrates that the SuDS hierarchy has been followed shall be submitted to and approved in writing by this Local Authority.'


'The submission of reserved matters shall be accompanied by a sustainable drainage scheme for foul and surface water drainage. No dwelling hereby permitted shall be occupied until a sustainable drainage scheme for foul and surface water drainage from the site has been completed in accordance with the approved details. The sustainable drainage scheme shall be retained, managed and maintained for the lifetime of the development in accordance with a management and maintenance plan submitted to and approved in writing by the local planning authority.'



Implementing SUDS into your development can result in a cheaper alternative to traditional drainage systems, dependant on the suitability of a number of different site restraints such as: lack of available space, infiltration capacity of the underlying ground, steep topography, sensitive environmental conditions, flood zones....the list goes on.

If your development is located within Flood Zone 1 and falls into either of the categories it will require a SUDS Drainage Design.


• 10+ dwellings / over half a hectare / building(s) exceeds 1000m²

• Office / light industrial - 1000+ m² / 1+ hectare

• General industrial - 1000+ m² / 1+ hectare

• Retail - 1000+ m²/ 1+ hectare

• Gypsy/traveller site - 10+ pitches

• Site area exceeds 1 hectare


Firstly, it must be determined if surface water flows can be disposed of via infiltration (soakaways), failing this flow should be directed to watercourse, only in the event that infiltration is not suitable and there are no available watercourses will a connection to the public sewer be authorised.


Ideally all flows as a result of the development should discharge to ground incorporating SUDS where possible, however this is not always achievable, dependant and a number of different restraints.


To reduce the time of concentration and offset the additional volume into either the watercourse or public sewer attenuation (storage) is generally required.


Attenuation can comprise of a number of different SUDS structures such as: Ponds, Detention Basins, Bio-Retention Areas, Swales, Permeable Paving and Geo-cellular Storage to name a few. Dependant on the location of the development, each Lead Local Flood Authority have their own preference and guidance as to which structures are preferable.


We undertake consultation with all the Statutory Authorities when developing our SUDS designs, which are developed in accordance with Building Regulations and CIRIA SUDS Manual. All of our drainage designs are modelled using industry recognised software.


*Detailed Planning Applications will require a more in-depth appraisal compared to Outline Planning Applications.


Click the link below for an explanation of diffrent types of SUDS componants:  


Our Sustainable Drainage Designs are developed in accordance with CIRIA, Building Regulations and SUDS Guidance set by the Statutory Authorise