As always we are in desparate need of volunteers for:
* helping to pick up trash in the park
* putting recyclables in the proper places
* street closers on the Monday for the Parade
AND… there is still lots of time to get your floats and costurmes together for this years parade;
Naturally, the theme is KASLO 125 years, so that leaves lots of ideas for birthday outfits, mining, logging and all the other wonderful things that have gone into making Kaslo, what it is today.
So come out and support May Days 2018. and yes, Saturday of May Days is still Kid Centric!!
for more info. http://www.kaslochamber.com/May-Days-Events or firstname.lastname@example.org
On March 25, Bill Kestell posted an update on behalf of Cooper Creek Cedar, summarizing the meeting that was held on March 13 with several geotechnical specialists, including myself. I would like to add a few observations on this meeting, and on the terrain stability issues in the Argenta – Johnson’s Landing area.
At the meeting, Chris Perdue, professional geoscientist who is consulting for CCC, gave. a presentation about his investigation of some factors that may have contributed to the 2012 Johnsons Landing landslide. In particular, he made the point that metamorphism* near the edge of the Fry Creek batholith* may have weakened the sedimentary rocks in the Gar Creek area, and made them more prone to failure. This is a reasonable hypothesis, and there is evidence of a number of ancient bedrock failures immediately south and east of the 2012 landslide. This zone of metamorphism is probably unique to the areas close to the batholith. On this point, the geoscientits s at the meeting agreed.
In our 2013 report on the Johnsons Landing landslide, of which I was one of the authors, we suggested that gradual movement of the nearby bedrock failures may have deformed the deep glacial deposits at the landslide source, and weakened them over time. This may have been one of the factors contributing to the 2012 landslide. (Two things we should keep in mind are: the 2012 landslide originated in glacial deposits, not bedrock; and the ancient bedrock failures in the area are very slow-moving, and as far as we know, none of them have produced a large rapid rockslide.)
In our report, we discussed several other factors which may have contributed to the 2012 landslide
. These include:
-the springs which are present at the landslide source, and which had increased in discharge before the landslide;
-karst* aquifers* in the marble* beds in the underlying bedrock, which may have fed water from nearby higher-elevation drainage basins to the springs;
-the record high rainfall in the preceding month, followed by a week of rapid snowmeltat higher elevations – these undoubtedly contributed to an unusually high groundwater level which was the ultimate cause of the landslide.
At our meeting, and in CCC’s March 25 update, the question was raised about whether or not the geological features that may have contributed to the 2012 landslide are unique to the Gar Creek area, or whether they are present across the entire AJL face.
We agreed that the zone of abundant bedrock failures near the contact with the batholith is probably limited to the Gar Creek – Kootenay Joe Creek area. However, we also discussed the fact that several other contributing geological factors are found across the entire AJL face. These include karst bedrock units, abundant springs, glacial deposits which include deep kame* features, the weak metasedimentary* rocks which are typical of the west slope of the Purcell Mountains, and the north-south strike* and westerly dip* of the bedrock which is fairly consistent along the face. It is also notable that there are several other large areas of apparent slow bedrock failure between Hamill Creek and Kootenay Joe Creek, which are unrelated to the Fry Creek batholith.
Another subject that was discussed at the meeting is whether the risk of very largelandslides such as the 2012 Johnsons Landing landslide is relevant to terrain stability issues associated with possible forest development in the area. Probably it is not. The 2012 landslide was an exceptionally rare event and is probably unique. It is unlikely that forest development would contribute to the likelihood of such a large landslide.
However, forest development does contribute to the risk of smaller landslides (and other geomorphic and hydrologic hazards such as erosion, stream sedimentation, and water quality impacts) in this area, as it does throughout the Kootenays and elsewhere. Forest development, especially road construction, substantially increases the likelihood of landslides. Most commonly, these are relatively small (less than a few thousand cubic metres) compared to the Johnsons Landing landslide (300,000 cubic metres). They can, in populated areas, present a risk to public safety and to property, as well as environmental impacts. Therefore, terrain stability mapping and assessments are important before any forest development or other industrial activity in the Argenta -Johnsons Landing area, as they are everywhere. Equally important is the principle that these assessments should contribute to decisions about how and where forest development is planned, and whether it should take place at all.
Peter Jordan, P.Geo., Ph.D.
* Some technical geological terms are explained here.
– metamorphism- changes to rock caused by heat and pressure
– batholith- a large intrusion of granite into older rocks (which in this case are sedimentary rocks of the Lardeau Group, Hamill Creek Group, Horsethief Creek Group, and Purcell Group)
– karst- features such as caves, sinkholes, springs, and underground stream courses, due to solution of rocks such as limestone marble – recrystallized limestone
– aquifer– a porous, permeable, underground formation which conveys groundwater
– kame – a thick deposit of glacial till and other sediments (glaciofluvial and glaciolacustrine), commonly forming terraces along the sides of valleys formerly occupied by glaciers (these deposits are especially prone to landslides)
– metasedimentary rocks– sedimentary rocks which have been altered by metamorphism (in this area,typically schist, phyllite, slate, quartzite, and marble)
– strike and dip- the orientation of sedimentary rocks (strike is the compass direction, dip is the angle ofinclination)
March 26, 2018 PHOTO : In September 2017, the ʔaq̓am community experienced a wildfire. It will now be reducing fuel in high-risk areas with support from a wildfire mitigation grant from Columbia Basin Trust.
REDUCING THE RISKS AND EFFECTS OF WILDFIRE
Twenty communities focus on mitigating wildfire with over $800,000 from Columbia Basin Trust
(Columbia Basin) – Wildfire can rapidly destroy homes, communities and lives. To brace against this danger—now becoming more of a risk than ever because of a hotter, drier climate—20 communities are implementing 28 projects that will help them prevent or brace themselves against wildfire. These projects are being supported by $822,406 from Columbia Basin Trust.
“Basin communities are part of forested landscapes, which gives us beautiful scenery and rich ecological values but also hazards to communities such as wildfire,” said Tim Hicks, Columbia Basin Trust Senior Manager, Delivery of Benefits. “Communities are well aware of this risk and came to us for help to both prepare for the possibility of these dangerous situations and to reduce their likelihood. This work aligns with our priority to support community resilience in a changing climate.”
With support from the Trust’s Community Development Program, local governments and First Nation communities are implementing projects focused on educating residents about how they can reduce wildfire risks on their properties, managing wildfire fuels, protecting critical community infrastructure and developing emergency response and evacuation plans. The Trust will continue to accept applications from local governments and First Nations until June 30, 2018. To see the full list of projects funded, visit ourtrust.org/wildfiregrants<https://ourtrust.org/?ddownload=11776>.
Here are a few of the current projects:
The First Nation community of ʔaq̓am is well aware of the need to prepare for wildfire. “In September 2017, the ʔaq̓am community experienced a 400-hectare wildfire that threatened property and resulted in the evacuation of 36 on-reserve homes,” said Julie Couse, Director of Lands and Natural Resources. “Approximately 110 individuals were displaced for a period of three days. The Wildfire Mitigation Grant will allow us to treat the highest-priority sites to protect our collective ʔaq̓amnik citizens.”
The community will conduct activities like tree felling, pruning and thinning to reduce fuel for wildfires on 63.4 hectares of high-risk areas, where wildfire may pose threats to human safety, structures, critical infrastructure or cultural heritage sites. It will also do Home Ignition Zone assessments on all on-reserve structures, plus do FireSmart activities with the goal of becoming a designated FireSmart-certified community.
Bring on the Students
The City of Castlegar is taking a collaborative approach to reducing the risk of wildfire within the community by working with students from Selkirk College’s Forestry Technology program. Students will conduct FireSmart assessments for private property owners, plus help reduce wildfire fuels on high-risk municipal lands by creating prescriptions and carrying out fuel reduction activities.
Through these efforts, “members of the public will learn the benefits of fire smarting their private properties,” said Lawrence Chernoff, Mayor of Castlegar. “By protecting private assets and the assets of the community, this project will reduce the risk of mass disasters and increase public safety.”
Creating a Good Example
If you want people to do something, show them how it’s done. That’s one of the City of Fernie’s approaches to reducing the risk of wildfire. It will create a FireSmart demonstration forest, in which residents will work alongside professionals to thin trees and reduce fuels for wildfires.
“This public participation approach will transfer wildfire risk mitigation awareness, knowledge and skills by showing and involving stakeholders, not just telling them,” said Ted Ruiter, Fire Chief and Director of Fire and Emergency Services. “It will encourage them to use skills gained in building the site to reducing vegetation and fuel hazards near their own homes and neighbourhoods, in ways that retain an attractive forest while respecting wildlife and other habitat requirements.”
Educating and Supporting the Public
From setting up information booths, to doing demonstrations, to speaking to students and recreation groups, the City of Revelstoke will be taking a multi-layered approach to educating the public about how to become FireSmart. The City will also help residents assess their properties and suggest debris removal methods, plus will establish clear guidelines for developers building in areas adjacent to wildlands.
“Since 2006, the City has had wildfire protection activities under way, particularly targeting municipal properties and community infrastructure,” said Dwayne Voykin, Emergency Program Coordinator. “The focus is now on continuing to educate the community about local wildfire risks, especially from human ignitions, helping private property owners reduce their risks of wildfire damage and giving developers clear requirements for new builds.”
Columbia Basin Trust supports the ideas and efforts of the people in the Columbia Basin. To learn more about the Trust’s programs and initiatives, and how it helps deliver social, economic and environmental benefits to the Basin, visit ourtrust.org<http://www.ourtrust.org/> or call 1.800.505.8998.