Lower Mainland
From Wikipedia, the free encyclopedia
The Lower Mainland is a name commonly applied to the region surrounding the City of Vancouver. In 2007, 2,524,113 people live in the region; sixteen of the province's thirty most populous municipalities are located there.[1]
While the term Lower Mainland has been recorded from the earliest period of non-native settlement in British Columbia, it has never been officially defined in legal terms. However, the term has historically been in popular usage for over a century to describe a region that extends from Horseshoe Bay south to the U.S. boundary and east to Hope at the eastern end of the Fraser Valley.[2] It has been increasingly used to include the commuter suburbs of the Sunshine Coast (Gibsons, Sechelt, Roberts Creek, etc.) extending to Powell River, British Columbia (see next section).
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[edit] Lower Mainland Ecoregion
"Lower Mainland" is also the name of an ecoregion — a biogeoclimatic region — that comprises the eastern part of the Georgia Depression and extends from Powell River, British Columbia on the Sunshine Coast to Hope at the eastern end of the Fraser Valley. The Lower Mainland Ecoregion is a part of the Pacific Maritime Ecozone [3] The provincial Ministry of Environment bases its Lower Mainland Region on this ecoregion, rather than on the traditional Lower Mainland alone.
[edit] Regional Districts and First Nations territories
Today, the Lower Mainland includes two Regional Districts: Metro Vancouver and the Fraser Valley Regional District (FVRD).
Metro Vancouver is made up of 21 municipalities (see below, Communities in the Lower Mainland). Metro Vancouver is bordered on the west by the Strait of Georgia, to the north by the Squamish-Lillooet Regional District, on the east by the Fraser Valley Regional District, and to the south by Whatcom County, Washington in the United States. The traditional territories of the Musqueam and Tsleil'waututh lie completely within the Metro area; the southern portion of Squamish First Nation traditional territory is also in the Metro area — its claims overlap those of the Tsleil-waututh and Musqueam (and also, therefore, the Sto:lo).
The Fraser Valley Regional District lies east of Metro Vancouver, comprises the cities of Abbotsford and Chilliwack, the districts of Mission, Kent, and Hope, and the village of Harrison Hot Springs. It also includes a series of electoral areas throughout the Fraser Valley and along the west side of the Fraser Canyon. The traditional territory of the Sto:lo First Nation is partly within this regional district, as is the entirety of the Chehalis First Nation. Sto:lo traditional territory more or less exactly coincides with the traditional conception of the Lower Mainland, except for their inclusion of Port Douglas, at the head of Harrison Lake which is in In-SHUCK-ch territory.
[edit] Population
In 2007 there were 2,524,113 people[4] living in the communities of the Lower Mainland, of whom:
- 274,388 lived in the Fraser Valley Regional District
- 2,249,725 lived in the Greater Vancouver Regional District (since renamed to Metro Vancouver)[5]
The population in the Lower Mainland was up 10.4% from the 2000 Census figures. This is among the highest in the continent. For the population of the cities within Metro Vancouver and Fraser Valley Regional District see: Metro Vancouver and Fraser Valley Regional District.
[edit] Natural threats
[edit] Flooding
The Lower Mainland is considered to have a high vulnerability to flood risk. There have been two major floods, the largest in 1894 and the second largest in 1948. According to the Fraser Basin Council, scientists predict a one-in-three chance of a similar-sized flood occurring in the next 50 years.[6]
In the Spring of 2007, the Lower Mainland was on high alert for flooding. Higher than normal snow packs in the BC interior prompted the municipal governments to start emergency measures in the region. Dikes along the Fraser River are regulated to handle about 8.5 metres in height, but warmer than normal weather in the interior caused large amounts of snow to melt prematurely, resulting in higher than normal water levels.[7]
Flooding can cover much of the Lower Mainland. Cloverdale, Barnston Island, Low-lying areas of Maple Ridge, west of Hope, White Rock, Richmond, parts of Vancouver and parts of Surrey are potentially at risk. In 2007, the Lower Mainland was largely spared, although northern regions of the province, along the Skeena and Nechako Rivers experienced floods. The flood risk was highest during the June 8-11 period. Climate scientists predict that increasing temperatures will mean wetter winters and more snow at the high elevations. This will increase the likelihood of snowmelt floods.[8]
The provincial government maintains an Integrated Flood Hazard Management program and an extensive flood protection infrastructure in the Lower Mainland. The infrastructure consists of dikes, pump stations, floodboxes, riprap and relief wells[9]
[edit] Earthquakes
While earthquakes are common in British Columbia and adjacent coastal waters, most are minor in energy release or are sufficiently remote to have little effect on populated areas. Nevertheless, earthquakes with a magnitude of up to 7.3 have occurred within 150 km of the lower mainland.
Based on geological evidence, however, the possibility of earthquakes with a more massive release of energy is a generally accepted possibility. Such massive earthquakes appear to have occurred at approximately 600-year intervals. Thus there is a probability that there will be a major earthquake within the next 200 years within the region.[10]
In April 2008, the United States Geological Survey released information concerning a newly-found fault line south of downtown Abbotsford, called the Boulder Creek fault. Scientists now feel this fault line is active and capable of producing earthquakes in the 6.8 Richter scale range.[11]
[edit] Communities in the Lower Mainland
[edit] References
- ^ Municipal Population Estimates 2007. Province of British Columbia Statistics Canada. Retrieved on 2007-12-01.
- ^ Gentilcore, R.L., ed. 1993. Historical Atlas of Canada, Vol II, The Land Transformed 1800-1891. Plate 36, "Lower Mainland 1881." Toronto: University of Toronto Press. ISBN 0-8020-3447-0.
- ^ Environment Canada "Narrative Descriptions of Terrestrial Ecozones and Ecoregions of Canada". Accessed 2006-06-08.
- ^ Municipal Population Estimates 2007. Province of British Columbia Statistics Canada. Retrieved on 2007-12-01.
- ^ Municipal Population Estimates 2007. Province of British Columbia Statistics Canada. Retrieved on 2007-12-01.
- ^ Flood Hazard Management on the Fraser River. Fraser Basin Council. Retrieved on 2007-06-24.
- ^ "Fraser Valley prepares for possible flooding", CBC News, 2007-06-05. Retrieved on 2007-06-24.
- ^ Drake, Laura. "Flooding in future may be more frequent, scientists say", Globe and Mail, 2007-06-16. Retrieved on 2007-06-24.
- ^ Ministry of Environment. Lower Mainland Dike and Emergency Maps. Retrieved on 2007-06-24.
- ^ British Columbia. Provincial Emergency Program. (1999). British Columbia Earthquake Response Plan, Appendix 2-The Earthquake Threat. ISBN: 0-7726-3924-8. Retrieved on: April 7, 2008.
- ^ McClatchy Washington Bureau. Earthquake risk. Retrieved on 2009-05-12.
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