Aqua Consultants Acquire Urban Drainage Modelling Consultancy RES Environmental

Aqua Consultants acquire urban drainage modelling consultancy RES Environmental

Published: 16 July 2025

Aqua Consultants, a leading environmental consultancy provider, part of the Adler & Allan Group, has acquired urban drainage modelling consultancy, RES Environmental, to further enhance its ability to tackle environmental challenges, such as reducing pollution and managing the effects of climate change in the UK.

RES Environmental delivers integrated catchment modelling, wastewater modelling, drainage design, and flood risk management, including sustainable drainage solutions (SuDS), to UK water companies.

With 35 employees, based in Sheffield and Exeter, RES Environmental is the eighth acquisition made by Adler & Allan in the utilities sector, and 12th overall in the last three years.

Mark Booker, Director, RES Environmental (L). Jason Drake, Director, RES Environmental (R).

Mark Booker and Jason Drake Directors at RES Environmental, said: “We are delighted to be joining the Adler & Allan Group. Their capability and presence in the UK water sector, combined with our specialist expertise and experience, is a fantastic opportunity to broaden our customer offer, whilst further strengthening Aqua Consultants’ leading position in hydraulic modelling.”

“Driven by our purpose of growing sustainable value for the future, we wholeheartedly welcome RES Environmental into Aqua Consultants. We now stand as the market leader in highly specialised hydraulic modelling for both wastewater and freshwater in the UK.”

Ben Shearer

Managing Director, Aqua Consultants

With an unmatched blend of advisory, engineering, commercial and project services, the acquisition of RES Environmental reinforces Aqua Consultants' position as the market-leading provider of end-to-end modelling for clean water and wastewater.

Ben Shearer, Managing Director, Aqua Consultants, said: “Driven by our purpose of growing sustainable value for the future, we wholeheartedly welcome RES Environmental into Aqua Consultants. The acquisition builds on our previous investment in clean water modelling capability. We now stand as the market leader in highly specialised hydraulic modelling for both wastewater and freshwater in the UK.

“In addition, this capability will work in harmony with our broader group expertise in flow and level monitoring products and pollution remediation. At a broader skills level, this acquisition allows us to invest in maintaining these specialist skills in the UK water industry.”

This acquisition follows the announcement that leading drainage and civil engineering experts Glanville Environmental joined the Goldman Sachs-backed Adler & Allan Group in April 2025.