I really didn’t know what thread to put this in, so I’m placing this as a thought experiment so we can all bounce some ideas around:
What would be the viability of dredging new land for development into Lake Ontario? I’m thinking of a few key precedents that pop into my head, then I’ll follow up with my rationale:
1. The existing dredged ports/steel works in the Golden Horseshoe (Portlands, Hamilton Harbour, etc) and elsewhere
2. The Netherlands
3. Ports and suburban developments along the gulf coast/Florida
4. The UAE
Okay, and now for the reasons:
A) high land costs (+potential returns) should theoretically eventually make this model viable, as it has in the UAE and elsewhere.
B) Allows an opportunity to better leverage areas quite near to rapid transit/other infrastructure that are much closer in and can be built from scratch- it’s just underwater right now.
C) It may be better than sprawl, and in any case the costs of greenfield land will eventually rise quite high as the supply slowly tightens to almost-null- that means (A) will be inevitable for developers even in a post-bubble Canada.
I’d argue (A) is both true today with our specific circumstances, and as (C) indicates, eventually we are going to run out of whitebelt land; we are going to have to undertake some sort of “lands needs assessment” that does not involve repealing the greenbelt one day.
This is all off the top of my head, but I hope to understand the reasons why this likely isn’t an option most of the time.
To answer this question in a serious way, you would need to peg a spot where you think this might work.
I say that, because the economic returns are different close to downtown that they would be out in eastern Scarborough.
But also because the environmental costs vary, the recreational impacts vary, and a variety of other issues may be in play (ie. viability of Billy Bishop, viability of shipping/port services) etc.
An example of ecological impacts you might not think of.........the creation/extension of the Leslie Spit, interrupted the flow of sand that naturally occurred from the foot of the Scarborough Bluffs to replenish the Toronto Islands.
I offer that as a case, where you now have the perpetual cost of adding back sand to the Islands or they would slowly disappear.
You also need to consider recreational impacts, building a new island or peninsula in front of a working beach isn't just an issue of impairing the view, its an issue that would affect tides, water circulation, and water quality.
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It the idea do-able? Potentially yes; but it carries many and varied challenges depending on the location chosen.
You also have to connect to existing City services, and one thing you may or may not know is that the City sewer system is almost entirely gravity-based. The lowest point is the sewers near the lake, nearest the sewage plants, so everything flows there without the use of pumps.
This creates a problem if you build south of the current waterfront, because you would either need a pump-based system, or you would have to make the land in the lake higher than the current waterfront...