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Type
Webinar

Flash flood control reservoirs in Rio de Janeiro

Event organised by ICE

Date
12 August 2025
Time

This event has now ended

Overview

Join us at 10:00 Jamaica time / 12:00 Brazil time for an ICE Americas technical webinar on flash flood control reservoirs.

Summer rainstorms frequently cause flash flooding in the northern areas of Rio de Janeiro, Brazil. After decades of persistent problems, the city’s water authority has finally planned a coordinated series of works to mitigate this hazard definitively. One of the most critical areas is the Mangue district, home to the Maracanã stadium, which is drained by five rivers.

This webinar details the geotechnical design of three deep water reservoirs, situated within constrained urban spaces in Rio de Janeiro. The design specifications mandated that the earth be supported by 80 cm thick diaphragm walls, with no use of external ground anchors beyond the excavation perimeter, which was surrounded by buildings. The design was subsequently developed using Plaxis 3D analysis, based on a comprehensive site investigation.

The most challenging reservoir was located on the triangular Varnhagen Square, presenting additional complexities due to its unique shape and the diaphragm wall intersection joints. Our solutions, derived from the Plaxis 3D model, involved ground improvement at the joints and the implementation of internal concrete rings, resulting in a safe and efficient construction process.

The presentation will encompass the site investigation, Plaxis 3D numerical analyses, jet grouting improvement at the joints, the impact of the concrete internal rings, and comparisons between the predicted and observed behaviour during excavation.

Speaker

Alberto Ortigao

Alberto Ortigao

country representative

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Alberto Ortigao

Alberto Ortigao, PhD, FICE, CEng is an experienced geotechnical consultant with a career spanning over five decades. His expertise encompasses many projects, including tailings and water dams, slopes, embankments, foundations, excavations, structures, and tunnels.

A Fellow and Chartered Engineer of the Institution of Civil Engineers, London, Dr Ortigao earned his Bachelor of Science in Civil Engineering from the Federal University of Rio de Janeiro (UFRJ) in 1971, followed by a PhD in 1980. He combined a successful academic career at UFRJ (1978-2003) with industry experience as a researcher at the Building Research Establishment, UK (1982-1984) and offshore foundation designer at Fugro UK Ltd.

His international career has included visiting professorships at UBC, City University of Hong Kong, and the University of Western Sydney, as well as projects work across South America, the UK, Canada, Hong Kong, Malaysia and northern Africa. This global exposure has cultivated fluency in English, Spanish, German, Portuguese, and French.

Dr. Ortigao is a prolific author with over one hundred technical papers to his credit. His expertise is further reflected in his published works: Soil Mechanics in the Light of Critical State Theories (Balkema, 1995) and Handbook of Slope Stabilisation (Springer Verlag, Heidelberg, 2004).

Dr. Leighton Ellis

Dr. Leighton Ellis

LNZ Designs and Development Co. Ltd.

director

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Dr. Leighton Ellis

Dr. Leighton Ellis is a civil and construction engineer, academic, and industry consultant with over 15 years of experience in civil engineering practice across the Caribbean. He is the Managing Director of LNZ Designs and Development Co. Ltd. and a senior lecturer at the University of the West Indies, where he teaches courses in construction engineering & management. His expertise spans the design and supervision of reinforced concrete and steel structures, project delivery systems, and engineering education with a regional focus. Dr. Ellis is widely respected for his contributions to capacity building in engineering and his passion for mentoring the next generation of professionals.

In addition to his technical and academic roles, Dr. Ellis is the founder of the Institute of Technology, Engineering and Management (ITEM), a training platform designed to bridge industry skills gaps across Small Island Developing States. He has hosted numerous professional development workshops, webinars, and training programs tailored for engineers, project managers, and construction professionals.