AVALON 和MORGAN'S GRANT

[danon]

OTTAWA 买新房可真难,西面有氡气,南面离机场近,北面有滑坡,东面还没听说什么.你们觉得MINTO 在AVALON 那片区怎么样? 与MORGAN'S GRANT 比是不是好一些?

 

[小傻]

最初由 danon 发布
。。东面还没听说什么.你们觉得MINTO 在AVALON 那片。。。

东面吗。。。只听说avalon那片原来是沼泽，minto填了盖房子，弄不好会有下陷啥的

 

[肥猫]

最初由 danon 发布
OTTAWA 买新房可真难,西面有氡气,南面离机场近,北面有滑坡,东面还没听说什么.你们觉得MINTO 在AVALON 那片区怎么样? 与MORGAN'S GRANT 比是不是好一些?

Hazard Lands, Unsafe Homes
by Ian Huggett


The national capital region's burgeoning population has no place to expand, and marginal land rejected for decades as unsafe for homes is being reconsidered for housing. Also referred to as "hazard lands," this land, which includes floodplains, wetlands, geological faults, retired landfill sites, and land polluted by radioactivity, harbours some of the region's last endemic wildlife populations.

Intense floodplain development along Lac Deschꮥs has been ongoing since the early 1980s, when most of the Ottawa River's elevated shoreline was used for prestigious waterfront homes. A federal and provincial agreement to prevent backfilling into the "high-velocity zone" failed to prevent development here―a section of the Ottawa River's shore that experiences a major flood every 20-100 years. New home owners are eligible for relief funds when a catastrophic flood occurs. However, neighbours are more likely to be engulfed after backfilling has narrowed the natural flood channel, forcing water onto adjacent properties.

In Aylmer, vestiges of silver maple swamp along Frazer Beach Road and in the Deschꮥs sector act as refueling and resting sites for migratory songbirds and nesting wood ducks. Without these corridors along the Mississippi flyway, fewer birds will survive their arduous migrations.

Prestige also has its health costs. Homes under construction in Gatineau Park's Kingsmere and Meech Lake sectors and in South March outside Kanata are being built on top of bedrock that emits natural radioactivity. In 1974 airborne surveys revealed exceptionally high levels of background radiation in South March―so high, in fact, that they prompted the Geological Survey of Canada to follow up with extensive ground level testing. Sediment samples were collected from streams and creeks throughout the area. The highest values of uranium were found in the tributaries of Shirley Brook near the village of South March.

Health officials continue to disagree on the potential health risks, fearing legal retribution from real-estate brokers and home owners. With remedial measures to vent radon gas accumulated in basements, homes continue to be built in these hazard lands. But the fact that occupants are exposed to elevated background levels of radiation and uranium sediments in the drinking water from domestic wells has never been seriously examined. Fear of plummeting property values following public hysteria has kept the evidence locked in the Geological Survey's basement archives for the past 28 years.

Private homes under construction at the edge of the Hazelden Fault may be vulnerable to the elevated emissions of radon gas released in faults. Shifting bedrock can also crack the concrete foundations, allowing the emissions to penetrate into basements.

Retired landfill sites, often the former haunt of gulls and ravens, can also be tombs of leaking leachate. Lebreton Flats, Dows Lake, Lincoln Heights and even the prestigious community of New Edinburgh near Rockcliffe Park are built on former landfill sites. How many leak? We don't know. But in the early 1990's, the Aylmer's Cook Road dump contaminated wells of a neighbouring residential district. The former City of Gatineau had illegally dumped years of untreated human effluent into the site, prior to capping it with clay. Leachate continues to drain into Hayworth Creek, which flows into Lac des Mountains, an artificial reservoir surrounded by recently built homes below Gatineau Park's King Mountain.

One place that has escaped destruction is an area along the shale and limestone flats near the Deschꮥs Rapids, where there is a peculiar grove of trees found nowhere else in the region. Living testimony of a history long gone, these Shag Bark Hickory are thought to have taken root after members of First Nations and voyageurs spent the night encamped along the portage above the raging Deschꮥs rapids. Their edible nuts provided an important source of food. It was an ideal location, adjacent to the Ottawa River travel corridor, with abundant hunting, fishing and gathering and surrounded by the music of the rapids. Cottages were built along this peninsula but later torn down by the National Capital Commission in the 1970s―and rightly so.

We must have sacred places. The intrusion of the human footprint seems to have left no stone unturned, no marsh undrained, no forest not uncut. The cost of building on marginal lands transcends health risks and wildlife habitat destruction. It removes the last vestiges that bind us to the natural world.

http://perc.ca/PEN/2002-11/s-huggett.html

 

[笑傲江湖]

:blink:

 

[danon]

多谢回贴。

For more information on landslides， Radon and earthquakes.
http://geoscape.nrcan.gc.ca/ottawa/landslides_e.php