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  • Improving stormwater management

    Rainwater harvesting for stormwater control
  • Rainwater harvesting for stormwater control
  • Rainwater harvesting for stormwater control
  • Rainwater harvesting for stormwater control
  • Rainwater harvesting for stormwater control

Rainwater harvesting for stormwater control

Up until now, rainwater harvesting has only been considered as a mechanism for saving water and for being seen as “green”. Although it is generally believed that there may be some stormwater benefits in reducing flooding, the official position in the UK at present is that these systems cannot be designed with the presumption that rainwater harvesting helps manage stormwater run-off. This research has been carried out to develop a unique methodology for designing and sizing rainwater harvesting systems to provide quantitative stormwater management benefits.

The methodology developed is included in BS 8515 Rainwater Harvesting Systems - Code of Practice.

This breakthrough means that the use of rainwater harvesting, which not only saves water, but also provides stormwater benefits, should tip the scales in favour of using these systems much more widely. This is particularly the case now that best practice stormwater management in the UK requires stormwater volume control as well as control over the maximum discharge flow rate from a development.

The research considered:

The methodology previously developed by HR Wallingford (developed for the UK, but applicable anywhere in the world) was used on a residential test catchment at Banbury, UK. A continuous 100-year rainfall series was used on a detailed InfoWorks CS model of the site. The rainfall data set was analysed for accuracy for a range of characteristics to ensure it was representative of rainfall for that location.

The results of the research demonstrate that rainwater harvesting can be used for stormwater control. The research report provides a methodology for designing stormwater systems.

Authors

Richard Kellagher, Juan Gutierrez-Andres

Keywords

rainwater harvesting; stormwater control

Completed

2013

References

SR736 Developing Stormwater Management using Rainwater Harvesting, January 2012, HR Wallingford.

Rainwater harvesting for stormwater management – design rules and demonstration pilot study Richard Kellagher et al. Cities of the future Xi’an – Technologies for integrated urban water management, China  2011

Rainwater harvesting systems for stormwater management: Feasibility and sizing considerations for the UK, Gerolin A, Kellagher RB, Faram MG. Novatech 2010, Lyon, France.

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Richard Kellagher

Richard Kellagher

Technical Director

+44 (0)1491 822419

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