In England the requirement for Sustainable Drainage Systems (SuDS) for development which could affect drainage on or around an application site forms part of the National Planning Policy Framework.
The Local Planning Authority, in conjunction with the Lead Local Flood Authority, have a duty to ensure that appropriate SuDS form part of the site development and are correctly maintained.
SuDS should be designed in accordance with the DEFRA guidance document National standards for sustainable drainage systems (SuDS), June 2025. The guidance document includes a number of standards for the SuDS to meet, including demonstrating diversity and amenity benefits, as well as control of runoff up to a 1 in 100 year event.
Hydrogeo can provide support for developments where SuDS are required. It is recommended that SuDS are considered at the earliest stage of site design in order to maximise the developable area and site layout, and prevent later delays and design revisions.
SuDS support services provided by Hydrogeo include: • Soakaway testing in accordance with BRE Digest 365 in order to determine the suitability of infiltration SuDS components; • Assessment, sizing and hydraulic modelling of various SuDS components in order to determine the most suitable scheme for the site; • Progression of a Drainage Strategy Report.
