Upper Squamish Valley Flood Plain Mapping

Apr 7, 2017
Electoral Area D

Project Summary:

In March 2017, the SLRD was awarded a grant of $150,000 from the Emergency Management B.C. Disaster Mitigation Program to bu used for the development of floodplain mapping, risk assessment and flood mitigation planning. The funds will be used to complete Flood Hazard Mapping and Risk Assessment of the Upper Squamish Valley area, located in SLRD Electoral Area D. 

The Squamish River is one of two river systems in the SLRD that are subject to frequent flooding, and that hold the highest consequences in terms of potential impacts. The District of Squamish (DOS) has recently completed a comprehensive flood plain assessment (Download the District of Squamish Integrated Flood Hazard Management Plan - Final DRAFT Background Report). 

This project will complete the assessment of the Squamish River system flood plain from the extent of habitation in the Upper Squamish Valley to the DOS boundary. The project results will inform both emergency management plans and development criteria, such as the Flood Control Level (FCL), in an area that is subject to recurrent flooding as well as increased development. The information derived from the SLRD study, in combination with the DOS study already completed, will give a complete flood risk profile to the entire Squamish River system, which will assist both the SLRD and DOS in moving forward with applications for future flood mitigation funding, where available. 

Project Updates:

September 18, 2017 - The Request for Proposals was issued and is available for download in the SLRD Contracting Directory. The deadline to submit proposals is 4:30 p.m. on Friday, September 29, 2017.

Project Schedule:

Anticipated DateAction
September 18, 2017Issue Request for Proposals (RFP)
September 29, 2017RFP Closes (4:30 p.m.)
October 16, 2017Proposal Acceptance and Project Commencement
October 24, 2017 (no later than)Initial project methodology meeting with Project Steering Committee
February 1, 2018Final report due
February 28, 2018 (no later than)Public presentation to stakeholders

Project Background:

At the April 19, 2017 meeting, the SLRD Board authorized the SLRD to allocate $150,000 in grant funding from Emergency Management BC to undertake floodplain mapping and flood risk assessment for the Upper Squamish Valley.

The funding was part of a $750,000 investment in flood protection in the SLRD made by the Province on March 31.

Floodplain mapping and flood risk assessment in the Upper Squamish Valley will allow for better and more accurate emergency management response plans, as well as informing work done by the SLRD Planning Department related to property development in the area.

A flood map identifies the boundaries of a potential flood event based on type and likelihood and can be used to help identify the specific impacts of a flood event on, for example, structures, people and assets.

Floodplain mapping in the province of British Columbia was formerly the responsibility of the Ministry of the Environment. However, during the late 1990’s, the provincial government drew back from the programs that provided flood mitigation and assessment data which was useful to local governments. 

Though the Squamish-Lillooet Regional District (SLRD) receives updated flood inundation maps from BC Hydro for river systems downstream of power generating facilities as a requirement of the Dam Safety Act (Bridge River and Cheakamus), other river systems have not been assessed since 1993 – 94.

The Province of BC, through Emergency Management BC, has provided this one-time grant of $150,000 to the SLRD for the purposes of flood mitigation, including floodplain mapping and flood risk assessment.

The Squamish River is one of two river systems in the SLRD that are subject to frequent flooding, and that hold the highest consequences in terms of potential impacts. (Through another provincial funding stream, the Pemberton Valley Dyking District has received grant funding for floodplain mapping and flood risk assessment on the other high-consequence river, the Lillooet River system.)

The District of Squamish (DoS) has recently completed a comprehensive floodplain assessment. By using the $150,000 grant to complete the assessment of the Squamish River system floodplain from the extent of habitation in the Upper Squamish Valley to the DoS boundary, the SLRD will gain important information on flood risk that will inform both emergency management plans and development criteria, such as the Flood Control Level (FCL), in an area that is subject to recurrent flooding as well as an increase in development. The information derived from the SLRD study, in combination with the DoS study already completed, will give a complete flood risk profile to the entire Squamish River system. That complete picture will benefit the SLRD and the DoS in moving forwards with applications for future flood mitigation funding where available.

 

Inside the SLRD > Current Projects & Initiatives > Upper Squamish Valley Flood Plain Mapping