About Us

Who We Are

RAA was established in 1996 to deliver innovative solutions for the complex needs of customers of the urban drainage industry. As Consulting Engineers, we maintain a traditional family based approach to business, putting client needs first and resolving flooding problems in the urban environment using the latest hydraulic modelling & analytical techniques. 

As a small consultancy we like to think we can be highly responsive and cost effective while at the same time offering a high quality specialised service. With offices in Sussex and the Midlands we operate nationally resolving flooding issues across the country.

Please call us to see how we can help on 01444 401840


  • 1996 - Richard Allitt Associates Ltd founded
  • 2002 - Due to expansion Richard Allitt Associates Ltd move to larger offices in Haywards Heath
  • 2006 - 10th Anniversary year of Richard Allitt Associates Ltd
  • 2007 - Due to further expansion Richard Allitt Associates Ltd move to larger offices in Staplefield
  • 2009 - Richard Allitt Associates Ltd involved in several key projects following recommendations in The Pitt Review
  • 2010 - Richard Allitt Associates Ltd wins 2010 Water Industry Achievement Award, in the SUDS & Flood Management initiative of the year category for their Urban Creep R&D Study.
  • 2011 - Expansion of staff requires renting of second office at Staplefield. Working towards external accreditation of Quality Management and Environmental Management Systems
  • 2012 - Obtained ISO9001 & ISO14001 accreditation for our Quality & Environmental Management Systems
  • 2014 - RAA Launch Remote Aerial Surveys, visit www.remoteaerialsurveys.co.uk for more information.
  • 2015 - RAA opens a new office in Bromsgrove, Worcestershire to support a growing range of clients
  • 2016 Richard Allitt Associates celebrates 20 years of operation

Our Team

Our people are friendly, skilled and hard working and are committed to delivering excellent service. They have a depth of knowledge and produce exceptional results for our clients. Our key personnel include:

Richard Allitt - Managing Director

Richard Allitt expert witness

Richard has more than 34 years' experience working with some of the largest UK water companies and local authorities. With a background in Civil Engineering, project management and Urban Drainage, Richard has developed particular expertise in Hydraulic Modelling of Sewerage Systems and Rivers and 2D Modelling of Urban Flooding. Richard is an urban drainage specialist and regularly presents at industry conferences and is recognised as one of the leading thinkers in the urban drainage industry. His contribution to the development of 2D Modelling and Integrated Urban Drainage are among his most notable achievements.

Martin Allitt - Team Manager and IT Manager

martin allitt

Martin has over 10 years' experience in civil engineering having worked as an Engineer and Modeller for Richard Allitt Associates Ltd. His particular responsibilities are project management including technical development and maintaining the IT infrastructure within the company. Martin regularly presents at various industry conferences and is well-known for his progressive thinking for hydraulic engineering and urban drainage.

Phil Gelder - Consultant

Phil Gelder hydraulic modelling consultant

Phil has 37 years experience in the Sewerage and Drainage industry having spent the last 21 years working for Severn Trent Water Ltd where he held a number of roles including Sewerage Asset Manager and Sewer Flooding Manager. Phil has particular expertise in dealing with sewer flooding problems for which he received a national award in 2004. Phil was also Severn Trent’s lead wastewater focus on dealing with the Gloucester flooding in 2007. More recently Phil helped Severn Trent prepare for the successful transfer of private drains and sewers. He has delivered presentations at numerous conferences and forums and has regularly being involved in developing and delivering R & D Projects. Phil has also sat on a number of national groups representing the interest of the Water Industry including the CIWEM Urban Drainage Group.

Our Approach

We will discuss your requirements and tailor our work to your needs. We have a robust service model but can provide the flexibility to meet your objectives and regularly update our working methods to incorporate changing techniques and emerging trends.

InfoWorks ICM (integrated all-source catchment modelling) is our program of choice due to its superior power and detailed 1D-2D coupling capabilities. It offers exceptional results through its general versatility and functionality of the software and provides us with the ability to test future developments within the catchment through use of ‘scenarios’.

Our Mission

Our mission is to resolve flooding problems in the urban environment using the latest analytical techniques and hydraulic designs.

Contact us on 01444 401840 for more details


UKAS Accredited Logo

Certificate No. 9794

ISO 9001

ISO 14001