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Climate Risks and Projections
Cowichan, we've been studying climate change in our region.
The Cowichan Region's climate varies greatly over a small area due to complex geography. Our ability to adapt to climate change requires specific information on how changes in temperature and precipitation will play out locally, how impacts differ through each season, and how they impact different parts of our region. Areas with the least precipitation include the east coast of the region. Climate projections for the Cowichan Region over the next century include an increase in temperature, an increase in precipitation, a decrease in snowpack through much of the region, and an increase in sea level. Learn more about local climate projections.
Climate impacts are expected to contribute to increased intensity and frequency of natural hazards such as heat and drought, flooding and sea level rise, landslides and erosion, wind and storms, and wildfires.
The CVRD has completed natural hazard risk assessments for some areas in the region. The CVRD has also adopted a risk tolerance policy to ensure developments will not increase risks from natural hazards. For more information on natural hazards, please visit our natural hazards page.
Heat and DroughtClimate models for the South Coast of BC project warming for all seasons. Summer will warm slightly more than other seasons, by 2.0o by the 2050s and 3.1oC by the 2080s. Our region can expect more than twice the number of hot days where temperatures exceed 25oC, from 16 days per year now to 39 days per year in the 2080s.While more summer days above 25oC may seem good at first, we can expect prolonged heat waves, more energy consumption, and health impacts. A seasonal increase in hot and dry conditions would increase the possibility of water shortages, increase wildfire risk, raise plant and livestock stress, and place thermal stress on fish and their habitats. Animals may migrate in response to warming. Increased temperature also means fewer frost days. A projected decrease in our snowpack of approximately 85% by the 2050s will impact watershed health, stressing the need for water conservation and storage. How can we prepare for the New Normal?
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FloodingThe Cowichan Region includes areas that are susceptible to flooding. Some urban areas exist within defined floodplains along rivers, lakes and coastal areas. Flooding can occur after extended periods of heavy rainfall ("atmospheric river" or "pineapple express" events) which can raise water levels and flood shoreline areas quickly and unexpectedly. Precipitation in fall, winter, and spring is expected to increase by about 10% by the 2080s. More precipitation will increase flood risk and erosion, localized stormwater ponding, ocean storm surge, or landslip.While some areas have flood construction levels to ensure that public and private are protected, many houses, roads and infrastructure are already built within these areas. We can take steps to prepare by learning about the different types of flooding including lake flooding, river flooding, and stormwater/urban flooding and ways to prepare. The CVRD has also completed updated flood mapping for the Lower Cowichan/Koksilah River, Shawnigan Lake, and the Cowichan River--Riverbottom Road Area. This mapping replaces the outdated provincial flood maps for these areas since the responsibility for flood mapping was turned over to local governments in 2004. How can we prepare for the New Normal?
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Sea Level RiseLiving along our beautiful coast lines comes with risks. As our climate changes, hazards like storm surges, eroding coastlines, and rising tides become more likely. As heat rises and polar ice caps melt, ocean levels increase. It is estimated that on the East Coast of Vancouver Island there will be a sea level increase of 80 cm by the year 2100. Impacts of sea level rise could result in both temporary and permanent flooding of some areas in our region. It may pose an increased risk to coastal infrastructure from flooding and erosion, and result in saltwater intrusion into coastal aquifers and farmland. Rising sea levels may also cause the loss of important habitat and biodiversity, as well as cultural and historical sites. Future land development in coastal areas will need to adapt by considering flood construction levels. Increasing storm surges could require new design guidelines for flood control levels, particularly as sea levels continue to rise as a result of climate change. | How can we prepare for the New Normal?
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Wind and StormsThe Cowichan Region’s mild climate with warm, dry summers and relatively mild winters are attractive to many. However, as our global climate changes, we are seeing frequent and extreme storms that have higher wind speeds and more intense rainfall. Extreme storms can destroy critical infrastructure; damage homes, buildings, businesses, and industry; compromise the environment; and harm residents. Damage from high winds can happen anywhere in the region. You can take the steps to prepare for wind and storms by considering ways to improve safety in your home, ensuring you have enough supplies in the event of power loss or phone service, and learning how to deal with damage and debris. How can we prepare for the New Normal?
| Photo courtesy of BC Hydro |
Landslide and ErosionThe Cowichan region’s hilly terrain, deep ravines, flowing rivers, and coastal cliffs form some of the most striking scenery of this region — yet many of these areas are also vulnerable to natural hazards like erosion, debris flows, and landslides. Wetter winters, drier summers, and extreme weather can affect stability of slopes, increasing potential for erosion and landslide. Impacts can be catastrophic to people, property, and critical infrastructure like roads and power lines. If you live along a ravine or natural drainage area, consider if your property may be at risk or could potentially put a downslope neighbouring property at risk. Make sure that development activities on unstable slopes are done with care to avoid increasing instability. Also, make sure culverts clear and able to pass water and other materials. | |
How can we prepare for the New Normal?
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WildfireClimate change is already impacting forest fires across our region. In British Columbia, fire records show that the forest fire season has been increasing in length by one to two days a year since at least 1980. Interface fires, where a wildfire threatens residential areas or infrastructure, pose a risk in rural and semi-rural areas and on the fringes of village and urban centres. All portions of the community are likely to be at risk or affected by smoke. While the trend is clear and well accepted, there is uncertainty about the rate and duration of change, in part because these factors depend on future emissions scenarios. The CVRD supports the protection of our properties and communities from fire. The CVRD's Public Safety Division coordinates public response and emergency management. | |
How can we prepare for the New Normal?
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