Syilx t̓ik̓t (flood) Adaptation Project

Project Overview:

“…water will always find a way around obstructions, under, over and through” Syilx Water Declaration, 2014.

The Okanagan Basin is experiencing increasingly intense t̓ik̓t and debris-flow hazards, but overall these are not mapped or recorded. Most recently, the Syilx Okanagan territory was heavily impacted by extreme flooding, on and off reserve, in 2017 and 2018. Since contact the population on Syilx Okanagan territory has settled largely in the valley bottom, filling in 85% of natural wetlands, with many permanent residencies existing adjacent to water or on floodplains.

Based on current climate change research, the magnitude of extreme spring freshet is projected to increase, and conditions similar to those experienced in 2017 and 2018 are expected to become the norm. Further, there is limited knowledge as to how these flood hazards interact with exposed communities and ecosystems, nor is there a consistent basin-wide approach to flood risk management.

In March 2018, the Okanagan Nation Alliance’s (ONA) Chiefs Executive Council (CEC) gave a directive through Tribal Council Resolution 372 for the Natural Resources department to complete a flood risk assessment, floodplain mapping, and an emergency response approach for the Nation. This includes a need to find solutions on how we may collectively better live with t̓ik̓t and have a coordinated approach to emergency response. By developing an Okanagan-basin (including the Similkameen watershed) risk assessment, the Nation can be proactive, and make risk-based decisions regarding their territory and communities, and determine what priority measures can be taken, if possible, to improve safety, reduce, or even negate, the effects of t̓ik̓t events.

t̓ik̓t has always been a natural part of the Syilx landscape. Western approaches to water situate it as a resource to be controlled and exploited for people’s benefit. In contrast, Syilx Okanagan land-based knowledge on water is more localized and holistic. From a Syilx Okanagan perspective, people can enhance their relationship to their local waters and learn how to live with t̓ik̓t.  t̓ik̓t also brings many positive benefits to the watershed, such as carrying nutrients for many different species and creating habitat for salmon. To have a truly effective approach to t̓ik̓t, and water management in general, we must integrate Syilx and modern watershed management practices moving forward.


  • October 2018, local governments were engaged by the ONA to start building relationships and complete a data gap analysis on Flood data in the region. Subsequently, a Flood Steering Committee was formed with representatives from local governments and from the Syilx Okanagan Nation to guide the longer-term initiative. The CEC designated Councillor Janet Terbasket (LSIB) as the political representative and Colleen Marchand (OKIB) as the technical representative.
  • April 2018 The Okanagan Basin Water Board (OBWB) in partnership with ONA, it’s member communities, the regional districts and municipalities are leading the LIDAR Flood Mapping for the Okanagan watershed. LIDAR (Light Detection and Ranging), a radar technology creates a digital 3D map of the landscape.
  • Fall 2018: Ebbwater Consulting compiled existing Flood risk data available and completed a Flood Risk Gap Analysis.
  • January 2019: Hazard Mapping (including Debris Flows) completed by Ebbwater Consulting.
  • February 2019: Setting the Stage: Workshop 1 and Watershed Tour 1. ONA hosted the workshop at the Cove. And the first watershed tour of the Okanagan watershed was hosted in snpinctn with Syilx knowledge keepers and En’owkin centre. The overall objectives of the watershed tours and workshop will be to:
    • Learn about the Syilx (Okanagan) perspective on flood (t̓ik̓t) resilience, including positive and negative implications of this phenomenon
    • Review maps of likely flood and debris flow occurrences in the study area
    • Identify what’s in the way of the water and what matters to the Syilx (Okanagan) people
    • Provide an opportunity for flood resilience community building in the region
      • Ebbwater collect exposure /vulnerability data
  • March 2019: Similkameen Watershed Tour
    • Refine hazard layer
    • Ebbwater Started Risk Assessment
  • April 2019: Ground Truthing: Workshop 2 was hosted at the Cove. The overall objectives of the workshop were:
    • Review flood and debris flow impacts information gathering, and mapping conducted as part of the project to date.
  • Present preliminary risk assessment findings to refine the process and obtain results that are meaningful to people living in the region.
  • Build on relationships and prepare for the next phases of work related to adaptation and resilience.
  • May 2019: North Okanagan Watershed Tour was hosted by OKIB to experience key tributaries that flow into Okanagan Lake. OKIB staff and elders shared firsthand experience of the 2017 and 2018 flood events.
  • December 20, 2019: Flood Risk Assessment was submitted to the National Disaster and Mitigation Program
  • April 30, 2020: ONA received a confirmation letter of project completion from the National Disaster and Mitigation Program.


Project Goals:

This project’s objective is to understand the risk due to t̓ik̓t and debris flows within the Okanagan and Similkameen Basin in order to support flood risk mitigation planning. This will be done by:

  • Listen and learn about what people in the region value, and how t̓ik̓t and debris flow has already impacted them.
  • Share Syilx perspectives on t̓ik̓t and water.
  • Obtain and analyze hazard and exposure information, and produce a risk assessment that is meaningful to all on the territory.
  • Collaborate with local governments to strengthen and align flood risk assessments regionally.
  • Provide supporting information for future community climate adaptation and resilience studies.

Project Plan:

In 2018-19, we completed the initial phase of a multi-year t̓ik̓t adaptation initiative. The Federal Government National Disaster Mitigation Program (NDMP) was set up to reduce the risks and impacts of t̓ik̓t on citizens. This program is administered on behalf of the Province by the Disaster Mitigation Branch of Emergency Management BC.

The NDMP four streams include:

  • Stream 1 – Flood Risk assessments
  • Stream 2 – Flood mapping
  • Stream 3 – Mitigation planning
  • Stream 4a – Small scale structural works
  • Stream 4b – Non-structural mitigation works

ONA contracted Ebbwater Consulting ( their flood management and engineering experts to carry out the Risk Assessment, with direction from Syilx knowledge keepers. Engagement of community leaders is a key aspect of the project. A Risk Assessment is a process to determine the nature and extent of risk, as well what are the potential impacts of future t̓ik̓t events.

A Risk assessment will support the Nation to be proactive in t̓ik̓t planning, guide mitigation solutions and for emergency management. For more information please visit:

The engagement for this project included land-based learning, completing watershed tours with Syilx Knowledge Keepers and elders.

Project Documents:

Syilx Okanagan Flood and Debris Flow Risk Assessment Poster

Synthesis Report

Basis of Study

Basis of Study Appendices

Qualitative Study

Qualitative Appendices

Quantitative Study

Quantitative Appendices





Affected People



Project Media:

Project Progress/Status:

Complete: Flood Risk Assessment.

Funds are currently being pursued to assist with the next step of mitigation planning.

Project Team:

Tessa Terbasket, ONA Research and Policy Coordinator

Project Partnerships:

There are six Syilx (Okanagan) Nation member communities located in the study are, as well as three regional districts and 14 municipalities. What six communities? Will there be a map?

The Syilx Okanagan Flood Adaptions Steering Committee, is comprised of political and technical representation from:

Okanagan Indian Band (OKIB)

Lower Similkameen Indian Band (LSIB)

Penticton Indian Band (PIB)

Regional District of Central Okanagan

Regional District of Okanagan Similkameen

Regional District of North Okanagan

City of Kelowna

Village of Keremeos

Okanagan Basin Water Board