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Our software is trusted throughout the world by government bodies, utilities, insurers, universities, consultants and members of the public to address today’s and tomorrow’s flood risk management challenges.

1D modelling

River Spey, Scotland

Flood forecasting, Scotland

CH2M is working extensively with the Scottish Environment Protection Agency (SEPA) in Scotland (United Kingdom), to help develop and improve SEPA’s flood warning systems.

ISIS was the core modelling tool used within the Rio Salado Master Plan project in Argentina

Master planning, Argentina

Our 1D solver was the core modelling tool used within the Rio Salado Master Plan project in Argentina. The study area was the 170,000 km2 Rio Salado Catchment to the south and west of Buenos Aires.

Flooding of the Tonle Sap, a tributary of the Mekong River in Cambodia

Basin planning, Mekong

The Mekong River Commission, an inter-governmental agency that works with the governments of Cambodia, Lao PDR, Thailand and Vietnam, has used our software for over 10 years to inform decision makers on the likely impacts of development scenarios.

Taihu basin

Scenario analysis, China

In order to understand and communicate the potential flood impacts and responses, 1D modelling for the Taihu Basin Authority in China was carried out to generate credible evidence of current and future flood risk for very large areas.

Cotswold Canal Modelling, England

Canal modelling, England

The 1D solver was used to support a four-mile canal restoration project on the Cotswold Canals through Stroud. The software was primarily applied to the section of canal between Wallbridge and Ebley due to the complexities within the channel.

Mersey estuary

Flood forecasting, England

To improve forecasts for the Tidal Mersey in Warrington (England), a new hydrodynamic forecasting model was developed, extending from Gladstone Dock to the Woolston Siphon Weir.

Flood mapping, England

Flood mapping, England

Enzygo used our 1D solver to review new flood maps which could potentially have a serious impact on the cost of insurance and hinder new development. It also brings areas of land into flood risk zones that had no record of previous flooding.

Managing tidal flood risk in London, England

Tidal flooding, England

The Thames Barrier and associated flood defences protect much of London. Our software is the model of choice for supporting the barrier's operation and informing the development of the Environment Agency's TE2100 long-term flood risk management strategy.

One-dimensional hydraulic modelling of the New River, England

System capacity, England

In 2012, Thames Water produced a detailed hydraulic one-dimensional hydraulic model using our 1D solver of the entire New River system in order to understand better the system's capacity and improve the river's operations.

Modelling outputs displayed using ISIS MAPPER

Modelling the Têt, France

Our 1D solver was used by BRL Ingénierie to model the potential flood risk of the River Têt and its tributaries in order to develop a flood risk management plan. The study modelled approximately 25 km of river covering an area of 45 km2.

Somerset levels and moors, England

Scenario analysis, England

The Somerset Levels and Moors are a managed catchment with the flow of water being controlled by a network of structures and pumping stations. During winter 2013-2014, the catchment experienced widespread flooding.

Whitecart flood prevention scheme, Scotland

Scheme design, Scotland

Glasgow City Council embarked on the White Cart Water Flood Prevention Scheme, using our 1D solver, to provide a sustainable, environmentally friendly solution to the flooding problem, comprising modest urban flood defences.

2D modelling

ISIS 2D outputs represented in the area of the proposed water control structure

Catchment plan, Argentina

A geomorphological study, using our 2D ADI solver, was undertaken for the Trinational Committee for the Development of the Pilcomayo River basin to provide secure access to Pilcomayo water resources for both Argentina and Paraguay.

Environmental impact assessment, Australia

EIA, Australia

QGC Pty Ltd utilised our 2D FAST solver to carry out an Environment Impact Assessment (EIA) in Queensland, Australia. The study area was 1,200 square kilometers and as part of the project, potential flood risk was assessed.

Inundation flood mapping in Boston, USA

Inundation mapping, USA

The possible effects of forecasted precipitation, sea level rise, storm surge and river dynamics in and around the Boston Water and Sewer Commission’s service area for the present and future years has been mapped using the 2D FAST solver.

Yanga National Park, Australia

Flood mapping, Australia

To understand the extent of flood for Yanga National Park, a large River Red Gum forest covering 760 km2 in Australia, the New South Wales government has utilised the 2D FAST solver as an environmental water management tool.

ISIS 2D flood modelling outputs displayed within ISIS MAPPER

Flood mapping, Canada

A flood mapping study for the Grand River watershed in Southern Ontario was carried out using the 2D ADI and FAST solvers to produce fluvial flood outlines and flood depths. The study provided an understanding of potential flood risk and property damages.


Watershed modeling, USA

CH2M has used the 2D FAST (Dynamic) solver within Flood Modeller Pro to identify areas with the highest risk of flooding as part of a watershed assessment for Radnor Township in Pennsylvania, USA.

Lowestoft Estuary Inception Modelling Study, England

Tidal modelling, England

To map flood risk from a potential tidal storm surge propagating up the Lowestoft Estuary and into Lake Lothing, the 2D ADI solver was used to develop a model to incorporate the estuary, Lake Lothing and the Kirkley Stream channel.

National flood mapping, Scotland

Flood mapping, Scotland

The Scottish Environment Protection Agency used the 2D FAST solver to produce a national surface water flood map to cover the whole of Scotland; 78,000 km2. The map complements the fluvial and coastal maps already available.

Forsyth County GA USA

Watershed modeling, USA

As part of a countywide study, CH2M has modeled and mapped the existing and future conditions floodplains for all flooding sources with a drainage area of 100 acres or greater on a watershed by watershed basis, using Flood Modeller Pro.

The 2D FAST solver was used to provide a rapid assessment of potential locations where pluvial flooding may occur

Pluvial flood risk, Ireland

The 2D FAST solver has been used to provide a rapid assessment of potential locations where pluvial flooding may occur as part of the Flood Risk Assessment and Management Study for the Fingal and East Meath region in Ireland.


Breach analysis, USA

CH2M performed dam-breach modeling using the 1D and 2D solvers within Flood Modeller Pro to confirm hazard classification of the Lane City Reservoir dam and develop dam-failure inundation maps for an Emergency Action Plan.

Visualising flood depths and velocities in the Marikina, Philippines

Risk mapping, Philippines

The Philippines Department of Science and Technology has instigated The Nationwide Operational Assessment of Hazards (NOAH) programme to help understand and manage this risk, using our 2D ADI and FAST solvers.


Watershed modelling, USA

The 2D FAST solver was used to deliver a watershed evaluation as part of the Southwest Florida Water Management District’s Watershed Management Program.

Cobbinshaw reservoir

Breach analysis, Scotland

British Waterways Scotland (now Scottish Canals) requested that a breach analysis of Cobbinshaw Reservoir should be carried out to reassess the dam category. Our 2D TVD solver proved to be the most appropriate tool for this project.

Outputs from Flood Modeller Pro represent flood extents for Saint Vrain Creek

2D flood modelling, USA

Flood Modeller Pro's 2D ADI solver was used to identify critical split flow paths and assist in establishing the hydraulic baseline for a 1D model.

Storm surge barriers NYC.png

Storm barrier studies, USA

CH2M recently completed a study for the New York City Economic Development Corporation on flood protection for New York City’s Gowanus Canal and Newtown Creek.

1D-2D linked modelling

Flood modelling of the Parramatta River in Sydney, Australia

Flood mapping, Australia

To evaluate the impact of site development on the surrounding water levels, the 2D ADI solver and 1D solver were used to simulate combined fluvial and direct rainfall flooding in a sub-catchment of the Parramatta River in Sydney.

Flooding is a signifcant problem for Aston Cantlow

Multiple sources, England

As part of a flood risk management study of Aston Cantlow in England, CH2M specialists developed an integrated mapping model for surface water and fluvial flooding to determine the likely flooding from combined sources.

The Office of Public Works in Ireland is undertaking an in-house Catchment-based Flood Risk Assessment and Management (CFRAM) Study of the Suir catchment in Ireland as part of the National CFRAM programme

Catchment study, Ireland

The Office of Public Works in Ireland is using our 1D solver (alongside TUFLOW) to identify and map the potential existing and future flood hazard and flood risk areas for a range of annual exceedence probabilities.

ISIS was used to model over 700km of the Siret river and major tributaties

Flood mapping, Romania

Our 1D solver was used to model over 700 km of the Siret River and its major tributaries. In rural areas, the floodplain has been modelled in 1D using extended sections, whereas in urban areas the 2D ADI solver has been used for the floodplain.

Orton Meadows.png

1D-2D modeling, England

CH2M was commissioned by the Environment Agency (England) to conduct a linked 1D-2D flood modelling exercise at Orton Meadows in Peterborough, England. The primary aim of the project was to provide clarity on the potential flood risk to residential properties.

Catterick 1

Scheme design, England

Flood Modeller Pro was a key tool used in the design stages of a proposed flood storage reservoir to alleviate the flood risk in the Yorkshire village of Catterick, England.

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