Flood Projects in the Thompson River Watershed
Flood hazard mapping completed in 2019-20 was intended to fill basic information gaps identified in the Thompson Watershed risk assessment. It was done at a base (screening) level, covering 478 square km across 11 floodplain sites in the Thompson-Nicola Regional District and one site in the Cariboo Regional District.
In 2020-21, the base level flood hazard mapping was updated to use the LIDAR data collected in 2019-20 for similar areas in the Thompson and Cariboo, and detailed flood mapping was completed within the City of Merritt on the Nicola and Coldwater Rivers.
The outcomes include hydrologic analysis results and screening-level flood hazard maps at a level of detail suitable for:
The outcomes of the detailed flood mapping on the Nicola and Coldwater Rivers within the City of Merritt are flood hazard scenario maps and Flood Construction Level maps within the city boundary, including the following:
The flood hazard mapping project in 2019-20 and the 2020-21 projects were funded by the Union of BC Municipalities Community Emergency Preparedness Fund program.
2021-2022 Project Work
Also see Advisory Committee for meeting summaries and materials.
The following flood projects were completed in the Thompson River Watershed and other areas of the Cariboo Regional District in 2020-21, and the final products are available:
GIS and database files from the 2020 and 2021 flood mapping work are available on request for flood projects. Requests can be made to the .
Base Level Flood Mapping Sites
The above map (updated to 2021) shows the sites chosen for base-level flood hazard mapping in the Thompson-Nicola and Cariboo Regional Districts.
2019-2020 Project Work
The following flood projects were completed in Thompson River Watershed in 2019-2020, and the final project deliverables are available.
The final report from 2020 is available for base-level flood hazard mapping in the Thompson watershed.
Flood hazard map layers from this project can be accessed through an online, interactive mapping website.
Also on the site are layers from the 2018-2019 Thompson Watershed risk assessment.
Raw topographical data was collected in the Fall of 2019 using light detection and ranging (Lidar) technology, and imagery captured in almost 5000 km2 of valley bottom throughout the Thompson River Watershed.
The project data allowed for detailed, up-to-date topographic maps and will support future detailed floodplain mapping. The deliverables of the project are intended to be shared with all orders of government in the watershed.
This data can be accessed by any order of government through the BC Ministry of Forests, Lands, Natural Resource Operations and Rural Development. to initiate a data sharing agreement and outline your geographic area of interest
This project is funded by the National Disaster Mitigation Program, funded equally by Public Safety Canada and Emergency Management BC.
A project Advisory Committee — with representation from elected officials and staff from local government, First Nations and the Province of BC — has provided guidance on this project. Information on the work of the Advisory Committee, and materials related to this work, are available: see Advisory Committee & Resources.
For more information, contact: