Group PHB
services-flood

High-risk flood zones determination

The growing popularity of the airborne LiDAR surveying is greatly due by its use for river overflow and floodplain analyses, and contributed significantly to the progress of the technology. Group PHB has been involved in airborne LiDAR surveys of floodplains since the earliest stages of this technology that started in early 1990.

Hydrology and floodplain analysis


Group PHB has been retained as the airborne LiDAR surveys contractor to provide precise topographic mapping of the Red River basin in Manitoba that facilitated significantly the determination of the zones at risk for potential flooding based on the ground relief, combined with precipitation amplitude statistics and drainage capacity records of the existing water courses.

Group PHB's recent airborne LiDAR surveys along the St. Lawrence River in the Province of Quebec helped extensively the confection of precise topographic which have been dedicated to hydrology studies and the risk management of overflow due to excessive precipitations or due to formation of ice jams that periodically occur in early spring.

Our latest airborne LiDAR surveys enabled the evaluation of the apprehended financial consequences of potential flooding of urban areas neighboring the Chateauguay River in the Province of Quebec.

All these studies led to the integration of the risk sectors into the overall urban planning and to elaborate control measures and damage reduction procedures.

Floodplain Determination Zone - Group PBH

The combined use of airborne LiDAR data, associated with various available records and information, such as water quality, water flow and drainage, sediment transport and global water level fluctuations provide a solid input for following activities:

  • Confection of three-dimensional models enabling dyking studies;
  • Creation of models that enable most respectful integration studies of urban zones with flora and wild life habitats and permit eventual impact tracking;
  • Production of precise topographic maps for the delineation of zones affected by potential inundation risks;

Combination and overlaying topographic information with urban planning schemes for environmental control and vulnerability reduction of urban zones.