BC Earthquake and Flood Hazard Zones - Natural Hazard Locations Key To Risk Management

BC Earthquake
BC Earthquake Risk Map
BC Earthquake
BC Earthquake December 2015 in High
Shake Hazard Zone
Location , location , location.

Was the December 30, 2015 earthquake in BC unexpected? No. It occurred in a high shake hazard zone as shown in the image to the left. Certainly risks can be managed when hazards are better known and policies are put in place to manage them.

Flood risks are like earthquake risks, as they are based on location.  For river flooding, floodplain maps show hazards due to high river flood levels.  This post shows the hazard zones maps available in BC.

Urban overland flood hazards can be predicted as well, beyond
regulated valley limits with river flood plain hazard zones.
We cannot predict where the next major storm will occur but the physical characteristics of the your location will put you in a hazard zone when and if that storm comes.

Calgary flooding was in a river flood hazard zone, known to be high risk, but ignored in terms of land use planning and flood plain regulation. Other urban flooding hazard locations have been thought to be difficult to map and manage, but research by CityFloodMap.Com shows those locations, beyond tranditional river valley flood plains, can be mapped as well - see image to right and our previous post on the details of analysis of Toronto flood events. Urban overland flood paths are like earthquake fault lines - you can't see them most of the time as they are usually inactive. And they both have wide areas of influence beside them - for overland flood paths this influence is because properties in the flow path are connected to many others by an underground sewer network - for fault lines the earth is connected.

Sometimes media get confused about location and assign risk from one area to another by mistake. In Toronto, when the GO Train was stranded in the Don River flood plain, the media, the train operator and the Environmental Commissioner of Ontario explained it as an unprecedented weather event, some linking it to climate change. How wrong.

Natural hazard reporting needs better
science in reporting causes.
In fact the record rainfall on July 8, 2013 that stranded the GO Transit commuter train was in Mississauga, in the Etobicoke Creek Watershed, several watersheds away from the Don River`s watershed. Rainfall in the East York area on the Don River Watershed recorded only 51 mm of rainfall according to the closest Environment Canada gauge - much less than the record 126 mm of rainfall in Mississauga`s Pearson International Airport.  The rail line was also in a high risk flood zone, not unlike "High River" Alberta was (and is).

More details on GO Train flooding are in a previous post. The following illustration shows how basic physical facts, including location, are ignored when reporting on the location of natural hazards and incidents:
BC Earthquake
Reporting on natural hazards should focus on basic facts, unlike the Toronto GO Train flood reporting that linked the stranded commuter train to record rainfall in a different watershed beyond the flooded Don River flood plain.
Location, location, location is important for assessing natural hazards and interpreting extreme rainfall.
Often media reports will not identify the spatial variability extreme rainfall, and may only have access to information available through Environment Canada which has a few active rain gauges (climate stations) that record short duration rainfall intensities.  The image above shows scattered Environment Canada stations. Below, more detailed City of Toronto data is explored.

Toronto Water, the group responsible for Environmental Assessment Studies that investigate flood causes and recommend solutions, summarized rainfall patterns for a Ward 11 community meeting on July 19, 2013 shortly after the July storm - recorded rainfall data is available from locations than Environment Canada sites. The presentation to the community showed very little to moderate rain recorded in the eastern part of Toronto, and few reported basement floods. The Don Watershed limits have been added to the a community meeting slide to show that only moderate rainfall was observed overall in the Don River Watershed.

Moderate rainfall in the Don River Watershed corresponds to an overall 5-10 year return period design event, with some Toronto gauges recording less than 2 year return period rainfall (19 mm) in the eastern part of the Don River Watershed, and some gauges on the western edge recording higher total.

As a result of the variable rainfall pattern The Toronto Observer reported that according to the Insurance Bureau of Canada, the Scarborough community was 'unscathed' by the July 8, 2013 event. This is supported by comments provided by Toronto Water in the report:

July 8, 2013 Storm Variability Toronto
Toronto Water received over 4,700 calls regarding basement flooding, but only 50 came in from Scarborough, said Ted Bowering, director of water infrastructure management for Toronto Water.

In Scarborough in fact the storm wasn’t all that intense. It was kind of like a normal summer thunderstorm,” he said. “So the impact was not that great at all.”

Flood reports vary after July 8, 2013 storm in Toronto. Less than 2% of
reported floods were from East Toronto (Scarborough). 
A City of Toronto staff report provides a less cluttered summary map of the rainfall variability and a summary table of reported flooding. The table shows less than 2% of reported flooding was in eastern Toronto, demonstrating the variability in rainfall severity.

Location can be miscommunicated even by the best managers. For example the TRCA summarized extreme rainfall events in Ontario and implied Mississauga rainfall was in Toronto and did not distinguish between watersheds where rainfall occurs and where it causes flooding:
Go Train flood toronto
Mississauga's CN Tower? Location matters in hydrology. Extreme rainfall is not evenly distributed and can be high in one watershed and low in another. This was the case for Hurricane Hazel and also the July 8, 2013 storm - both storm were light on east Toronto (including the Don River Watershed) and heavy in the western watersheds including those outside of Toronto.
Note: August 19, 2005 storm appears mislabeled as '2013'.
****

So location matters for natural hazard risks. Extreme rainfall is highly variable in terms of its spatial pattern. Sometimes local data, beyond that which is available from Environment Canada, can be used to assess the variability in rainfall across watersheds and drainage catchments,

****

To help assess flood risks, CityFloodMap.Com has created Canada-wide mapping of extreme rainfall trends so that risks of flooding due to higher rainfall can be assessed for 565 climate stations locations. Fortunately, this Environment Canada data shows that only a few percentage of the stations have a statistically significant increase in observed extreme rainfall. CityFloodMap.Com has also created tablular summaries of extreme rainfall trends, summarized by province.

13 comments:

  1. I simply wanted to write down a quick word to say thanks to you for those wonderful tips and hints you are showing on this site.
    nebosh igc course in chennai

    ReplyDelete
    Replies
    1. INDEED DR SAYO HERBAL HEALER HAS THE CURE FOR FOLLOWING HERPES VIRUS, HIV/AIDS, CANCER ALL TYPES, DIABETES, HEPATITIS A/B, PAD, ETC......FOR MORE INFORMATION VISIT HIS WEBSITE: http://sayoherbalhome.com/ I was once a victim of the herpes virus with many symptoms on my body, I was cured of the virus thanks to the help of Dr Sayo herbal medicine. I saw most of his patient testimonials on blogs and social media pages, cured of various disease/virus and illnesses. I contacted him on his email address to which he replied and asked me a few questions and the preparation method for which I paid, he sent me the herbal medicines and instructions on how to take it I apply the herbal medicine for 4 weeks and the symptoms on my body were healed after taking the herbal medicine treatment, I went for test and my result was negative with know trace of virus in my blood and am completely cured. You can also be cured, contact him on his email:  sayoherbalhealer@gmail.com  or WhatsApp him on +2349012175679 or visit his facebook page: https://www.facebook.com/SayoHerbalHealer

      Delete
  2. This is an awesome post. Really very informative and creative contents. These concept is a good way to enhance the knowledge
    nebosh course in chennai
    offshore safety course in chennai

    ReplyDelete
  3. It’s always so sweet and also full of a lot of fun for me personally and my office colleagues to search you blog a minimum of thrice in a week to see the new guidance you have got.
    nebosh course in chennai
    offshore safety course in chennai

    ReplyDelete
  4. Obviously, the primary blog preferred position of a t blogurning pack over a rucksack is that you can easily wheel your rigging around without bloggetting sweat-soaked. A moving sack additionally liberates your back for a littler day pack, and gives you the alternative to set your littler sack blog on top and roll that one too. The downsides: Bags with wheels generally cost progressively, offer somewhat less limit than blogknapsacks of This might be the least known advantageous effect of cod liver oil. Unsaturated fats found in fish oils help hydrate your skin and improve skin irritation.comparative measurements (since wheel wells and the retractable handle cut into the space accessible for your stuff)… and gauge a couple of pounds more. Recollect that, except if you're going with your blog own head servant, you'll despite everything be conveying a wheeled pack now and again — up steps, into and blogout of overhead compartments, here and there travel, over sloppy pathways, and so forth. Regardless of whether you lean toward a moving sack, you despite blogeverything need one that is as lightweight as could blog reasonably be expected — and don't let it cheat you into imagining that you don't have to pack so light.

    ReplyDelete
  5. Dear friends online My name is Destiny Hudson And I live in the USA, Dominica I am here today to appreciate the good work of Dr Oyagu, for helping me curing my HSV 1&2 Disease, I contacted the virus from my Partner, i found out he was cheating on me, so i broke up with him, 2 month later i went to test myself in the hospital when i was seeing sore on my mouth and Private areas, i was diagnosed of HSV 1&2. i tried using the acyclovir medicine but it didn't help in curing it, i went on a search and found out Dr Oyagu curing people illness, and so i got his email and i was told how i can get his herbal cure, 3 days later i received his medicine after using it for 2 weeks i was tested again and was confirm negative, today i am totally free. If you are over there looking for solution email: oyaguherbalhome@gmail.com or contact him on whatsapp +2348101755322 or visit his website https://oyaguspellcaster.wixsite.com/oyaguherbalhome today and share your own testimony. And He also has herbal cure for the Following DISEASES, eczema, urethra wart, chronic problems. Herpes, Cancer, Als, Hepatitis, Diabetes, HPV ,Infections, ulcer ETC

    ReplyDelete
  6. INDEED DR SAYO HERBAL HEALER HAS THE CURE FOR FOLLOWING HERPES VIRUS, HIV/AIDS, CANCER ALL TYPES, DIABETES, HEPATITIS A/B, PAD, ETC......FOR MORE INFORMATION VISIT HIS WEBSITE: http://sayoherbalhome.com/ I was once a victim of the herpes virus with many symptoms on my body, I was cured of the virus thanks to the help of Dr Sayo herbal medicine. I saw most of his patient testimonials on blogs and social media pages, cured of various disease/virus and illnesses. I contacted him on his email address to which he replied and asked me a few questions and the preparation method for which I paid, he sent me the herbal medicines and instructions on how to take it I apply the herbal medicine for 4 weeks and the symptoms on my body were healed after taking the herbal medicine treatment, I went for test and my result was negative with know trace of virus in my blood and am completely cured. You can also be cured, contact him on his email:  sayoherbalhealer@gmail.com  or WhatsApp him on +2349012175679 or visit his facebook page: https://www.facebook.com/SayoHerbalHealer

    ReplyDelete
  7. I am so delighted to be completely cured of Herpes Simplex Virus 1/2. After having it since March 4th of 2019. I did some online research when I came Across Herbalist Razor Herbal Exploits. I was amazed😊 when I Came across some of his Works And those he has helped, I decided to Contact him For help, Which He Kindly did Wholeheartedly❤❤, I am glad 🥰To be finally healed Of HSV 1/2 through Herbalist Razor Traditional Herbal Mixture☘☘. Email him on : herbalistrazorherbalhome@gmail.com.
    WhatsApp : +2349065420442. His Facebook Page : https://web.facebook.com/HerbalistrazorMedicinalcure ,YouTube Page : https://www.youtube.com/channel/UCHQPQK1KqGsQQNqR2zYdiww
    His website : https://herbalistrazorherb.wixsite.com/drrazorherbalhom

    ReplyDelete
  8. I'm very excited to inform everyone that I'm completely cured from my Hpv recently. I used Dr Onokun herbal medicine, it's really help during my outbreaks but I totally got cured! from my Hpv with a strong and active herbal medicine ordered from a powerful herbalist Dr onokun Contact him via Whats App +1 323 689 3594 or visit his Facebook page: https://www.facebook.com/naturaltreatmentcenter1 or website: www.dronokunherbalcure.wordpress.com

    ReplyDelete
  9. I have been suffering from a deadly disease (Hsv) for the past 2 years now, I had spent a lot of money going from one places to another, from churches to churches, hospitals have been my home every day residence. Constant checks up have been my hobby not until this faithful day, I was searching through the internet, I saw a testimony on how Dr Oyagu helped someone in curing his (Hsv) herpes disease, quickly I copied his email which is oyaguherbalhome@gmail.com just to give him a test I spoke to him, he asked me to do some certain things which I did, he told me that he is going to provide the herbal cure to me, which he did, then he asked me to go for medical checkup after some days after using the herbal cure, behold I was free from the deadly disease, he only asked me to post the testimony through the whole world, faithfully am doing it now, please brothers and sisters, he is great, I owe him in return. if you are having a similar problem just email him on oyaguherbalhome@gmail.com visit his website https://oyaguspellcaster.wixsite.com/oyaguherbalhome Or whatsapp him via +2348101755322

    ReplyDelete
  10. Natural Herbal Medicine To Cure {HERPES DISEASE} TOTALLY HERE
    Do you need a solution to cure your Herpes Disease contact Chief Dr Lucky to help and he will surely help you to cure your Herpes Virus .. I have suffered from Herpes-2 Virus for 4years ago that almost took my life. But one day I was searching the internet and I found Chief Dr Lucky saw so many testimonies on how Chief Dr Lucky helps people in curing their deadly diseases, and I contacted Chief Dr Lucky, asked him for solutions and he started the remedies for my health. He prepared herbal medicine for me and I received the herbal medicine and after using it for 2 weeks my condition has greatly improved, all my symptoms including Abdominal pain, Nausea and vomiting, Loss of appetite stopped, so I went to my doc and was confirmed negative. I am Herpes Virus free! contact the herbal doctor via his email> chiefdrlucky@gmail.com also visit his page> http://facebook.com/chiefdrlucky or his cell number / WhatsApp> +2348132777335 Website > http://chiefdrlucky.com

    ReplyDelete
  11. All thanks to Mr Anderson for helping with my profits and making my fifth withdrawal possible. I'm here to share an amazing life changing opportunity with you. its called Bitcoin / Forex trading options. it is a highly lucrative business which can earn you as much as $2,570 in a week from an initial investment of just $200. I am living proof of this great business opportunity. If anyone is interested in trading on bitcoin or any cryptocurrency and want a successful trade without losing notify Mr Anderson now Whatsapp: (+447883246472)
    Email: tdameritrade077@gmail.com

    ReplyDelete

Note: Only a member of this blog may post a comment.