

Directors
Meet our team of directors, who combined have vast knowledge of the water industry in, Modelling, SI, Leakage, Pressure Management, Engineering, artificial intelligence and machine learning.

Operations Director
Paul Johnstone
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Paul is our Operations Director & Head of IT. With over 29+ years experience working directly for UK water companies. His previous position as a senior manager role at a water company in the South West and Southern England, brings a wealth of knowledge expertise.
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He has experience, skill and knowledge of network design, operational activity, pressure management, modelling, supply interruption, leakage, growth and PR submissions.
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As a proficient hydraulic network modelling manager and user of InfoWorks WS, delivering schemes that reduce leakage, extends ageing asset life and reduces supply interruption. Experienced in project management delivery of schemes to improve network resilience and operational control.
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From his previous roles working for UK water company's, he is able to confidently work with water company staff to ensure that ODI and AMP regulatory targets are understood and objectives met. He also experience using GIS, Leakage and SI software & finance packages, and many other associated apps and technology used in the water industry.

Client Services Director
Simon Croft
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Simon is our Client Service Director, with over 24 years of experience working in the water industry including 15 years working directly for a large water company in the east of England in a senior manager role.
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He has considerable experience, skill and knowledge of water distribution network design, and is able to manage the building and calibrating of network models to a high standard while integrating corporate data and hydraulic modelling services together to enable real time updates.
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He has extensive knowledge in developing solutions for and reporting persistent low pressures (formerly Dg2). Simon regularly engages the wider water industry regarding modelling services, ODIs, optimisation, housing growth, strategic real time modelling. Providing resources, guidance, asset management and strategic planning.
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Simon having experience as a manager within a UK water company, understands the needs and pressures that water companies are under and is able to work closely with water company teams to ensure that regulatory and internal targets are meet.
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Director of Water Quality Services
Alan Maher
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Alan is Director of Water Quality Services with over 20 years’ experience in clean water networks, including 15 years with a major UK water company.
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A Chartered Water and Environmental Manager, he holds an MSc in Modelling and the APM Introductory Certificate. His leadership across modelling, operations and consultancy teams gives him strong cross‑functional insight and an ability to anticipate client needs.
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A recognised specialist in water quality modelling, Alan focuses on turbidity modelling using PODDS and has been part of the University of Sheffield PODDS consortium for 16 years. He has led major programmes and advised senior directors during high‑profile water quality incidents.
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He has authored ODI‑focused strategy documents for taste, odour and appearance, and is applying automation to improve root‑cause identification. Alan is an experienced trainer and modeller, proficient in Synergi, Infoworks, MapInfo and ArcMap.
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Services include: strategy development; turbidity and trunk‑main VCDM modelling; automated conditioning design; rezone modelling; chlorine decay modelling; time‑of‑travel and water‑age analysis; discolouration risk mapping; operational modelling; and technical training.

Managing Director Wastewater
Paul McDonald
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Paul is our Wastewater Manging Director of Trident Group Solutions. He is a Chartered Water and Environmental Manager with 20 years’ consultancy experience within the Wastewater and Environmental sector.
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He is a recognised industry specialist in network modelling and urban drainage, having provided technical oversight of wastewater modelling programmes for many of the UK & Ireland water companies. As Head of Wastewater Networks for a tier one consultancy, Paul was overseeing multi region wastewater networks teams delivering a portfolio of urban drainage projects as technical lead across seven water company frameworks.
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His experience ranges from technical assurance, project management, model auditing, feasibility studies, drainage area planning, integrated catchment management, CSO compliance & water quality assessments, surface water management, flood risk, third party contractor management, network optimisation and strategic design solutions for sustainable urban drainage systems.​
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Paul’s extensive industry insight, sector expertise, multi‑disciplinary delivery experience, and consistent record of success position him to effectively support water companies in meeting their ODI and regulatory performance commitments.