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Recommendations to Update Non-Statutory Technical Standards for Sustainable Drainage Systems (SuDS) - WT15122

The aim of this research project is to report whether updating the current Non-Statutory Technical Standards (NSTS) could help provide for multiple benefit sustainable drainage systems (SuDS), and if so, what those updates should be. Based on the findings from this research, recommendations have been made to replace the current standards 1 to 6 with a new suite of six standards. The new standards cover the following:
• Standard 1: Runoff destinations
• Standard 2: Everyday rainfall
• Standard 3: Extreme rainfall
• Standard 4: Water quality
• Standard 5: Amenity
• Standard 6: Biodiversity
Each standard is accompanied by a set of clarifications that provide guidelines to support the interpretation, delivery and evaluation of the standard.

This report has two parts:
Part 1 – Project Report – This describes the objectives of the project, the technical approach, the research findings and recommendations.
Part 2 – Updated Standards – This presents six new standards that are proposed to replace the existing standards 1 to 6 in the current NSTS for SuDS.

This report is also accompanied by eight separate annexes.

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email: Please tell us what format you need.

The dissemination video can be found following this link:"

Please see inside final report.
Project Documents
• FRP - Final Report : WT15122 Recommendations to Update Non Statutory Technical Standards for SuDS   (2351k)
• ANN - Annual Report : WT15122 Annex H   (485k)
• ANX - Annex : WT15122 Annex A   (4507k)
• ANX - Annex : WT15122 Annex B   (2027k)
• ANX - Annex : WT15122 Annex C   (2644k)
• ANX - Annex : WT15122 Annex D   (5528k)
• ANX - Annex : WT15122 Annex E   (876k)
• ANX - Annex : WT15122 Annex F   (561k)
• ANX - Annex : WT15122 Annex G   (8301k)
• OTH - Other : WT15122 Research Slide Pack   (5313k)
• SUM - Summary Report : WT15122 Research Summary   (158k)
Time-Scale and Cost
From: 2020

To: 2021

Cost: £84,276
Contractor / Funded Organisations
H R Wallingford Ltd
Flood Management