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1929 Ottawa sewer explosion

Bytown	(founded 1826)
City of Ottawa	(1855–present)

Timber trade	1806
Rideau Canal	1826
ByWard Market	1827
Shiners' War	1835
Stony Monday Riot	1849
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Capital	1857
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Hull–Ottawa fire	1900
Parliament Hill fire	1916
Sewer explosion	1929
Gouzenko Affair	1945
Greber Plan	1950
Transitway	1983
Embassy attack	1985
Ottawa Senators	1992
Trillium Line	2001
Parliament shootings	2014
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Historical individuals

On May 29, 1929, a series of explosions in the sewers of Ottawa, Ontario, Canada, killed one person.^[1]

The first blast occurred just after noon in the Golden Triangle area, west of the canal; over the next 25 minutes, a series of explosions travelled the length of the main line of the sewer system. The explosions first moved east under the canal and then moved through Sandy Hill under Somerset Street. After passing under the Rideau River, they followed the line as it turned north through what is today Vanier, before going through New Edinburgh to the point where the sewer system emptied into the Ottawa River.^[2]

The blasts were fairly small, except when manhole covers were involved. At these points, the access to oxygen fuelled towering flames that erupted through the manhole covers onto city streets. The covers themselves were blown high into the air.^[3]

Most of the damage from the sewer explosions occurred where sewage lines were attached to less sturdy pipes inside houses; blasts destroyed the plumbing in many residential basements. Besides property damage, the explosions caused one death and many injuries.^[3]

The cause of the explosions was never definitively determined. Methane naturally occurs in sewers, but it never accumulates in a concentration powerful enough to cause explosions of the magnitude seen in Ottawa. The Ottawa Gas Company vehemently insisted that the disaster could not have been caused by its lines.^[3]

It is now thought that the fuel stations and mechanic shops in the city—new since the introduction of the automobile—contributed to the calamity. While these shops were required by law to dispose of all waste oils in a safe manner, there were no inspections; dumping waste into the sewage system was commonplace. In combination with problems in the sewer system's design, this pollution likely caused the 1929 blasts.^[3]

References

^ Ayers, F. E (Mar 1969). "Sewer Maintenance in a Cold Climate". Journal (Water Pollution Control Federation). 41 (3). Water Environment Federation: 418–423. JSTOR 25036277.
^ Ken Lytle; Katie Corcoran Lytle (18 May 2011). The Little Book of Big F*#k Ups: 220 of History's Most-Regrettable Moments. Adams Media. p. 104. ISBN 978-1-4405-1252-0. Retrieved 5 October 2011.
^ ^a ^b ^c ^d John Taylor (2001). "Engineering, audit, and fire: Governance and modernity in depression Ottawa". In Keshen, Jeff; St-Onge, Nicole (eds.). Ottawa: Making a Capital. University of Ottawa Press. pp. 333–334. ISBN 978-0-7766-0521-0. Retrieved 2011-10-08. ...on 29 May 1929...with school children on the way home for lunch, the main trunk sewer in the central part of the city blew up in a series of explosions over a three-mile stretch...requiring in all about twenty-five minutes to cover the route from the Golden Triangle to the Ottawa River.

Bibliography

"Article preview. One dead in blasts of Ottawa sewers; Several others are injured and buildings are wrecked in wholesale outbursts. Residents leave home. Woman, 71, succumbs to burns after flames from explosion set fire to her home. Various theories on blasts. Three injured at store". The New York Times. May 29, 1929. Retrieved 2011-10-09.
"Ready to make known facts regarding sewer explosion". Ottawa Citizen. Aug 17, 1931. p. 7. Retrieved 2011-10-08. ...Mr. Campbell of Boston had reported that it was due to gasoline; when challenged, however, he could not find any substantiation for the statement in the report.
"Tennis club wins suit against city. Judgment costs Ottawa $3,790.30 for damages to property". The Montreal Gazette. Jan 7, 1936. p. 6. Retrieved 2011-10-08. ...John Campbell, an engineer who investigated sewer gas explosions that occurred in Ottawa in 1929...

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