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| '''Seymour Narrows''' is a {{convert|5|km|mi|abbr=on}} section of the [[Discovery Passage]] in [[British Columbia]] known for strong tidal currents.<ref>{{BCGNIS|15307|Seymour Narrows}}</ref> Discovery Passage lies between [[Vancouver Island]] at [[Menzies Bay, British Columbia]] and [[Quadra Island]] except at its northern end where the eastern shoreline is [[Sonora Island (British Columbia)|Sonora Island]]. The section known as Seymour Narrows begins about {{convert|18|km|mi|abbr=on}} from the south end of Discovery Passage where it enters the [[Georgia Strait]] near [[Campbell River, British Columbia|Campbell River]]. For most of the length of the narrows, the channel is about 750 m wide. Through this narrow channel, currents can reach 15 kn. | | Hi there, I am Felicidad Oquendo. Interviewing is what she does but soon she'll be on her personal. The thing she adores most is flower arranging and she is trying to make it a profession. Kansas is where her house is but she needs to move simply because of her family.<br><br>My website; [http://www.myccos.com/UserProfile/tabid/61/userId/430/Default.aspx car warranty] |
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| Seymour Narrows was described by Captain [[George Vancouver]] as "one of the vilest stretches of water in the world."<ref>[http://archives.cbc.ca/science_technology/applied_science/clips/3654/ B.C.'s deadly Ripple Rock blown up, CBC Broadcast Date: April 5, 1958]</ref> Even after [[Ripple Rock]] was removed, it remains a challenging route. In March 1981, the Star Philippine, a freighter ran aground in the narrows.
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| Seymour Narrows is notable also because the flowing current can be sufficiently turbulent to realize a [[Reynolds number]] of about <math>10^9</math>, i.e. one billion, which is possibly the largest Reynolds number regularly attained in natural water channels on Earth (the current speed is about 8 m/s, the nominal depth about 100 m). Turbulence develops usually around a Reynolds number of 2000, depending on the geometric structure of the channel.
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| ==Ripple Rock==
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| {{main|Ripple Rock}}
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| Ripple Rock was a submerged twin-peak mountain that lay just nine feet beneath the surface of Seymour Narrows. It was a serious hazard to shipping, sinking 119 vessels and taking 114 lives. The gunboat [[USS Saranac (1848)|USS ''Saranac'']] was one of the rock's first recorded victims. On April 5, 1958, after twenty-seven months of tunnelling and engineering work, Ripple Rock was blown up with 1,375 tons of [[Nitramex]] 2H [[explosive]] making it the largest commercial, non-nuclear blast in North America. The [[Halifax Explosion]] in 1917 was larger but it was not a deliberate act.
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| The event was broadcast live on Canadian Television. The footage is also regularly screened at the [[Campbell River Museum]].
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| [[Vancouver, BC|Vancouver]] band [[The Evaporators]] wrote a song about the event and released it on their 2004 album ''[[Ripple Rock (Album)|Ripple Rock]]''.
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| ==References==
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| {{reflist}}
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| Canadian Tide and Current Tables, Vol. 6, 2003
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| ==External links==
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| * [http://www.vancouverislandabound.com/tamingof.htm Overview of Seymour Narrows]
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| * [http://www.vancouverislandabound.com/tamingof.htm Ripple Rock Explosion, Vancouver Island]
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| * [http://archives.cbc.ca/science_technology/applied_science/clips/3654/ Ripple Rock blown up - Unforgettable Moments - CBC Archives] (Video)
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| * [http://www.crmuseum.ca/ Campbell River Museum official website]
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| * [http://www.crmuseum.ca/exhibits/ripplerock.html Ripple Rock page]
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| * [http://www.tideandcurrent.net/?p=148 Navigating Seymour Narrows]
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| * ''Freighter Aground in Canada'', in the New York Times, March 18, 1981
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| {{coord|50|08.2|N|125|21.2|W|region:CA_type:isle|display=title}}
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| {{BritishColumbia-geo-stub}}
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| [[Category:Central Coast of British Columbia]]
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| [[Category:Discovery Islands]]
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| [[Category:Straits of British Columbia]]
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