#metroscapes 2020 in review

2020 was garbage. Most annual reflections will have that message. It caused me stress in my professional and personal life, but looking back, I didn’t do too bad in terms of exploring the local metroscapes.

This was my first full calendar year living in the Tri-Cities, and adjusting to the shift. It was my opportunity to explore new places and get familiar with my new home base. But it was also a time to reflect and build upon the change it had brought about to my website. This was no longer a Toronto-centric hobby. This was exploring the intersections between natural and built environments in multiple cities.

Thanks to COVID-19, I didn’t get to explore The Hammer or tie up loose ends in Toronto as much as I had hoped. The first and second waves kept me close to home, avoiding non-essential trips on public transit and at other indoor settings in other cities. But I had a couple of worthy trips, and lots of analysis to go with.

So let’s do another year-in-review, review the ground I was able to cover in this pandemic year, and look forward to what 2021 will bring.

New Projects and Posts

Let’s start off with the new projects I launched this year. There were a few that came with settling into the Tri-Cities’, and launching into a third city.

After four months in the Tri-Cities, I was able to get my head around the urban fabric. I was able to nail down the layout of its neighbourhoods, and delineate the way of the watersheds. Unlike Toronto, the Tri-Cities still has greenfield areas, and drains to a large river instead of a shoreline, so having a better grasp on the lay of the land was helpful.

Then COVID-19 happened. As we began getting our heads around how it spread and the precautions we had to take, it really highlighted the importance of public space. This spoke to my philosophy on the freedom to roam along waterways, shorelines and utility corridors in our urban centres, and how we should be doing more to connect the missing links.

I then expanded to Hamilton in the summer. I discovered quickly that I needed to scope my area of analysis to account for its amalgamation. I was then able to complete project analysis for its shoreline and hydro corridors.

Lastly, I capped off a project I had been picking away at for two years: Crossing the Line, an analysis of Toronto’s freeways and railways. After experiencing these barriers first hand over 7 years and 1,400 kilometres, it’s nice to finally quantify it. I hope this will be a great resource for years to come.

Walk Statistics

I pretty much matched my activity from last year. Moving cities was something that held me back in 2019, so that’s why COVID didn’t cause me to do less in 2020.

  • Over 27 walks, I covered 414 km, about the driving distance between Niagara Falls and Kingston. That’s 1 more walk and only 7 km more than 2019.
  • The average walk was 15.4 km, virtually the same as 2018. This is the same distance as walking between Conestoga Mall and Mill Stations in KW.
  • The longest walk was October 12, coming in at 24.8 km. This was following the Grand River from Highway 7 to the literal northeast corner of the city.

Walk Highlights

Normally, this is where I highlight the neighbourhoods and watersheds I covered and compare back to the previous year. But this is becoming less relevant as I shift towards multiple cities. Instead, I will highlight some of my notable walks.

One big personal achievement was climbing Pinnacle Hill. It’s a pretty uninteresting drumlin at the 401 and Homer Watson, but it is prominent enough, rising 50 metres from Conestoga College Boulevard. I had noticed it every time my dad was driving us towards Toronto, and I always wanted to check it out, so it was fulfilling a tiny childhood dream.

I also finished walking the entirety of the Grand River. I finished the first leg through Cambridge in October 2019. In 2020, I did the next leg to Highway 7 in Kitchener, and then the last stretch from there to the northeast corner of Waterloo. This makes for a total of 60km of walking along the trunk of the watershed.

When I expanded into Hamilton, I was able to tackle one of its signature trails, a former rail line that slinks down the Escarpment. I hadn’t had much luck coordinating walks with peak fall colours in previous years, but it worked out pretty well this time.

One of the first things I noticed after moving to Cambridge is the Portugese Swamp, a complex of wetlands bisected by Can-Amera Parkway on the east side. Me and my kid were able to check them out first hand back in November, it was pretty neat.

Lastly, a big milestone was the first phase of the new East Don Trail. This was very significant to me not only because it was a major new multi-use trail in a ravine. The East Don Trail is near my old stomping grounds as a child, and was a place I’d go to often to ride my bike. So more childhood feels.

Looking to 2021

Moving to the Tri-Cities was a big shift, and adding Hamilton to the mix was another step in that direction. While I’ve reflected on the change a couple times, I’ve had some additional insight as of late.

It was a shock to realize I’m starting to run thin on plans for the Tri-Cities. After doing over 100 walks in Toronto, I did not expect to run into this problem so soon. Part of this is the area, as Toronto is twice the size of the Tri-Cities, and over 15% of the latter is still greenfields.

But it’s also history, density and growth. It makes for a different urban fabric. In older, denser and faster growing cities, utility corridors are well traversed albeit crowded on all sides, and a lack of stormwater management means more runoff that collects in numerous tributaries. This can make the public realm more granular and unique. By comparison, the Tri-Cities has plenty of wide open green spaces, generally larger and more intact. In between, the sweeping single-detached neighbourhoods with significantly more infiltration and stormwater management have less infrastructure and drainage corridors fracturing them.

It’s better from an ecological and flooding perspective. But it’s not the same for my walks.

I’ve been looking at expanding to other cities, all while coming to this realization. With this in mind, while I look to cities close to my home base, I will also be looking for the more fine-grained metroscapes.

Crossing the Line

If you’re a regular follower of mine, you know what I do: I explore metroscapes. That’s the sexy tagline, anyway. When I was in Toronto, a more contexual explanation was that I explored many waterways and green spaces, trying to tell a story, trying to see how far I could go in a continuous path, and highlight where I got interrupted.

This involved some of the better known ravines and stretches of shoreline. But it also involved less trodden paths: smaller tributaries, lost rivers, and hydro corridors. If there was a barrier to doing this, it was usually one of four things: private residences, golf courses, highways or railways. Private property was discussed in, and the inspiration for, my project exploring Toronto’s shoreline. I’ve also written about golf courses, specifically the ones owned by the City.

Now it’s time to address the latter two.

The Legacy of Our Transportation System

Railways and highways can be huge barriers. They are long, linear corridors that cut through a city, often dividing it by severing roads and communities. For railways, this is a legacy of building before the city became dense and built out. For highways, this is a legacy of autocentric planning.

In most cases, it created long uncrossable walls, literally or figuratively. Local roads provide many of the spots to overcome this, and there are a few bridges or tunnels dedicated to those on foot or using pedal power. However, there are parts of the city where it’s a long way between these crossings. It’s not a big deal in a car, and maybe less so on a bike, but it could add many minutes to a one-way trip on foot. This makes neighbourhoods less walkable and can hold them back from their fullest potential.

Many of these railways and highways are not going away anytime soon, and while the pandemic has fuelled much discussion about adequate walking and cycling space on the city’s streets, I feel like this aspect gets forgotten. There should be an effort by the city to build bridges and tunnels across these facilities, better connecting neighbourhoods and decreasing walk and cycle times.

Some Stats

  • There are 7 highway corridors in the city, running a total length of 101 kilometres and covering 1,535 hectares (including interchanges).
  • There are 12 railway corridors, with a couple owned by Canadian Pacific Railway, and the rest owned by Metrolinx (GO Transit). They run a total length of 186 kilometres and cover 615 hectares, not including yards (which are another 227 hectares).
  • There were a total of 307 “segments” analyzed. 187 were railways, 97 were freeways, and 20 were combined/parallel
  • The median distance between crossings was about 800 metres. This was larger for highways (969 metres highway vs. 745 metres for railways).

Ranking

I tried to come up with a way to rank all 291 segments in a systematic way, giving weight to:

  • Length (duh);¹ ²
  • Land use;³ and,
  • Feasibility to create a crossing.⁴
  1. Anything that was less than 240 metres (5 minute walking distance from midpoint to midpoint) was discounted.
  2. Average walking speed is often cited as 5 km/h, However, this may be considered quite fast. City of Toronto Standard Operating Procedures for signal timing cite a speed of 1.0 km/h for able-bodied pedestrians, and 0.8 km/h for areas where a significant number of pedestrians use assistive devices. The latter speed was used in the length scoring.
  3. Scoring was ranked (in descending order): Residential or mid- to high-density office, parkland, commercial, industrial. This was a rough estimate based on satellite imagery, and where a mix of uses was present, the two dominant uses on both sides was recorded.
  4. Feasibility was judged by whether public land (a park) or rights-of way (e.g. a road or road allowance) was available on either side of the corridor. Scoring was assigned to whether or not this was present on both, one or neither side.

The result is not perfect, of course. It doesn’t account for residential or employment density, socioeconomic needs, the road or trail network leading from the crossing, or the costs / length of a crossing itself. Not to mention that some may find it inappropriately appropriately weighted. But like anything on this site, it’s more of a conversation starter than a definitive conclusion. Anyone can download the data themselves, create their own formulation, and come to their own conclusions.

For now, I have taken this and featured 6 collections of segments (with 1 or more segments in the top 20), and listed 14 more individual segments to make a top 20.


Featured Collectives

1. West Canyon

It’s kind of funny to see this on here, because I identified the 401 / 427 interchange as an issue area long ago. It was #2 in my ranking of public golf courses that should be converted to parkland.

However, this analysis makes it clear that the issue extends further south. The segments of the 427 between Dixon Road and Rathburn Road are 1.85 kilometres on average, which can add up to 30-40 minutes to a trip. This can discourage active transportation in the adjacent neighbourhoods of Renforth-West Mall, Markham Wood, Eatonville, Eringate-Centennial, West Deane, Princess Gardens, Willowridge, Richview Park, Martin Grove Gardens and Richmond Gardens.

One notable opportunity towards the north end is to extend the Mimico Creek Trail throught the interchange, and perhaps convert the city-owned Royal Woodbine Golf Club to parkland one day. Further south, plenty of opportunity exists to establish crossings between The West Mall and The East Mall.


2. Highland Creek Wedge

From the far west side to the east side. This one didn’t stick out to me until I took a walk following Adam’s and Smalls Creeks in May 2018. Both the 401 and Highway 2A (a stub of the planned East Gardiner) act to box in the Highland Creek neighbourhood from adjacent Port Union and Rouge Hill. Though it only involves three segments, the two 401 segments are 1,280 and 1,720 metres long (21-27 and 29-36 minutes), and Highway 2A is 2,420 metres long (40-50 minutes).

There are easy opportunities to establish some crossings by joining the dead ends of Meadowvale Road (2A), Centennial Road (2A) and Morrish Road / Sudbury Hall Drive (401). There’s also parklands to link to, namely Dean Park and the corridors / headwaters of Adam’s and Smalls Creeks.


3. Lower Don Valley

This should not be surprising. Establishing connections across this segment of the Don River valley has been a big part of Toronto’s history. Many 19th century crossings existed and many bridges seen today are second or third replacements, but photogenic monuments from the 1921 old Don Mills Road bridge to the 1918 Prince Edward Viaduct live on.

East-west crossings of the valley east of downtown are now plentiful, with the 5 bridges from Eastern Avenue to the Riverdale Park Bridge averaging 325 metres. But north of here, the gaps are 1.15 km (19-24 minutes) on average. But this also exposes a major flaw in my methodology, in that it does not account for the lateral gap across a corridor. To say the lack of corridor crossings has an impact on neighbourhood walkability would be a huge stretch, as some parts of the ravine stretch 400 to 800 metres across, at minimum.

That said, I’ve left it up here because it does impact connections to and within the parkland. Though there are large feasibility, cost, ecological and natural hazard aspects to creating new connections into the Don Valley, it’s a conversation worth having. The pandemic should have made that clear.


4. North York Wall

I’ve known the 401 to be a wall in this area, but it wasn’t until doing this project that I realized how many significant barriers all clump together here. Overall, there are and one railway segment, and taking out , they average 1.83 kilometres long (30-38 minutes walking). This acts like a huge wall between over 20 neighbourhoods in the former cities of North York and York.

There are plenty of roadways to act as abutting links. In addition, some green pathways could be forged by restoring some lost (buried) creeks, including Meadow (Keele to Dufferin), Yellow and/or Mud (401/Allen interchange), Wilket (Yonge to Bayview), and Vyner (Bayview to Leslie). Converting another golf course to parkland (Don Valley, #1 in my ranking of public golf courses) would greatly improve the stretch between Avenue Road and Yonge Street.


7. Warden Greenway

Yet another seemingly no-brainer of a connection I identified in my many walks, and it’s great to see the numbers backing it up. These are two segments that are west of Warden Avenue, one being Canadian Pacific’s Belleville Subdivision and the other being the 401. Both are around 1,275 metres (21-27 minutes).

What’s notable about these two segments, and the reason they rank so high, is because there is one easy opportunity to link them via the Warden Hydro Corridor, which runs up through both of them. This is not just a typical hydro corridor however, as it appears to no longer be in use. It presents a huge reforestation and trail opportunity, and crossing these corridor segments could be part of it. It has even been proposed to re-align Taylor Massey Creek through this corridor to improve its health.


8. East Danforth – Beaches

This one flew under the radar for me. I had noticed the parallel alleys and the lack of grade-separated connections over the cross streets, but not the significance of the distances between. This railway corridor is part of GO Transit’s Lakeshore East Line, and VIA Rail’s route between Toronto and Ottawa/Montreal. The four segments in question are between Coxwell and Warden Avenues. The average distance between streets here is just over 1 kilometre, or 18-22 minutes.

There are a few adjacent dead ends or parallel roadways to make a connection. However, one significant opportunity is the Small’s Creek Ravine, which is one of a couple small East York creeks that have not been buried yet. Parkland flanks both sides, separated by the railway berm. However, recent Metrolinx expansion work has failed to establish this as a bridge that it should be.


The Rest of the Top 20

#5: Mimico Split

Corridor:
Termini:

Distance:
Land Use:

Connection:

Oakville Subdivision
Royal York Rd / Park Lawn Rd
1,480 m
Residential / Residential
Grand Ave / Manchester Parks

#6: East Beach

Corridor:
Termini:
Distance:
Land Use:

Connection:

Kingston Subdivision
Chesterton Shores / Rouge River
1,740 m
Residential / Park
Starspray Boulevard

#9: North Malvern

Corridor:
Termini:
Distance:
Land Use:

Connections:

Belleville Subdivision
Tapscott Rd / Morningside Ave
613 m & 1,170 m
Residential / Residential
Horseley Hill Park & Maidenhair Ln

#10: Finch Hydro

Corridors:

Termini:
Distance:
Land Use:

Connection:

Bala Subdivision & Highway 404
Finch Ave E / McNicoll Ave
1,110 m & 878 m
Residential / Residential
Finch Hydro Corridor

#11: Highland – Malvern

Corridor:
Termini:
Distance:
Land Use:

Connection:

Highway 401
Progress Ave / Neilson Rd
1,590 m
Residential / Commercial
East Highland Creek – Malvern Branch

#12: Lambton Lead

Corridor:
Termini:
Distance:
Land Use:

Connections:

Galt Subdivision
Humber River / Jane St
1,150 m & 629 m
Residential / Residential
Lambton Arena & St Clair Ave W / Dundas St W

#13: Brookhaven – Mt Dennis

Corridors:

Termini:
Distance:
Land Use:

Connection:

Weston & Mactier Subdivisions
Jane St / Ray Ave
837 m
Residential / Residential
Touchstone Dr / Cobalt St

#14: Upper Liberty

Corridor:
Termini:
Distance:
Land Use:

Connection*:

Weston Subdivision
Queen St W / Strachan Ave
755 m & 637 m
Residential / Residential
Joe Shuster Way / Sudbury St

* Note: The segment from King St W to Strachan Ave will be addressed by the completion of the King-Liberty Pedestrian/Cycle Bridge.

#15: Parkwoods – Don Mills

Corridor:
Termini:
Distance:
Land Use:

Connection:

Don Valley Parkway
East Don Trail / York Mills Rd
723 m
Residential / Residential
Deerlick Creek Tributary

#16: Corktown Corner

Corridors:
Termini:
Distance:
Land Use:

Connection:

Don Valley Parkway & USRC
Cherry St / Eastern Ave
665 m & 707 m
Residential / Office
Bayview Ave

#17: East Queensway

Corridor:
Termini:
Distance:
Land Use:

Connection:

Gardiner Expressway
Royal York Rd / Grand Ave
672 m
Residential / Residential
Wesley St

#18: West Toronto Diamond

Corridors:

Termini:
Distance:
Land Use:

Connection:

Weston, Mactier, Galt and North Toronto Subdivisions
Cherry St / Eastern Ave
647 m & 592 m
Residential / Commercial
Old Weston Rd / Miller & Lindner St

#19: The Malls

Corridor:
Termini:
Distance:
Land Use:

Connection:

Galt Subdivision
The East Mall / The West Mall
1,780 m
Commercial / Commercial
Norris Glen Rd / Index Rd

#20: East Point Edge

Corridor:
Termini:
Distance:
Land Use:

Connection:

Kingston Subdivision
Manse Rd / Beechgrove Dr
1,680 m
Industrial / Park
Chemical Ct


Data Portal

Data Table: Web | CSV | TSV | PDF

Mapping: KML | KMZ

Hamilton: Intersection of Metroscapes and Rural Areas

Last week, I began expanding the Metroscapes website to a third city: Hamilton. I had long had my eye on exploring Hamilton, based on a few adventures out there with a friend that used to live there, and knowing there was unique urban fabric.

Hamilton sits at the west tip of Lake Ontario, providing a long shoreline to explore. After doing a series on the Toronto shoreline, I was naturally drawn to expand it, something I cannot do in the Tri-City. A sandbar, the industrial heritage and the continued operation of Hamilton Harbour makes for some interesting flux points. There’s your typical suite of rail lines and hydro corridors.

There’s also the fact it is a city of over a half-million, with the Niagara Escarpment running right through it. This makes for more vistas, public space, infrastructure challenges and waterfalls.

However, one thing I did not account for on launching in Hamilton: its amalgamation.

Prior to 2001, Hamilton was 144 square kilometres, somewhat bounded by the harbour, the 403, a line between Rymal Road / Twenty Road, and Centennial Road. As part of the same “Common Sense Revolution” that abolished Metropolitan Toronto, Hamilton swallowed its five neighbours: Ancaster, Dundas, Flamborough, Glanbrook, and Stoney Creek. This made the area of the “city” balloon to 1,150 square kilometres, or 8 times its size.

The thing with amalgamation: while Hamilton was mostly a built-up urban area in 2001, its neighbours were not. Even post-amalgamation, the urbanized part of Hamilton hasn’t spread like wildfire. Lands within the urban boundary still only account for 260 square kilometres (22.6%).

Up until this point, this hasn’t been an issue for me. The city limits of Toronto and most of the Tri-City are urbanized, making for obvious intersections between natural and built environments. But did I want to explore all the way out in Hamilton’s rural areas?

No. That’s not really what I’m interested in. Obviously, there’s no intersections with a built environment, and rural lands are challenging to explore given their vastness and lack of public space.

So going forward, I have delineated a rough area where my walks and analysis will be bounded to, measuring about 330 square kilometres. It encompasses Hamilton, Dundas, Greensville (part of Flamborough), eastern Ancaster, northwestern Glanbrook, and north/western Stoney Creek. It’s mostly guided by the urban boundary, but also includes the escarpment and some other features. They are not strict boundaries either. It just provides some guidance on where I will focus my time and interest.

So I hope you enjoy. The walk page is up, and I currently have two projects cobbled together: shoreline ownership and hydro corridors. You can look forward to more analysis of neighbourhoods, railways, and an inventory of the city’s waterfalls in the future.

But as always, use this work as inspiration, and go explore your local metroscapes for yourself.

Parks and Pandemics: The Need for Open Space Laid Bare

I started walking around Toronto over 6 years ago, well before I started this site. As I started covering more of the city, I had a vision for what a top-tier trail system could look like, using and connecting the city’s ravines, utility corridors, shoreline and other open spaces. And I was groundtruthing how many of these links didn’t exist.

So 2 years ago, I made a map. This map was my vision, and an atlas of problems and opportunities for Toronto’s trail system.

Toronto’s existing (green), planned (yellow) and missing (red) trails.

Urban experts will tell you all the benefits of having a high-quality and fully-integrated trail network. It encourages more active transportation use, reduces emissions, improves cardiovascular health, etc.. Any well-planned major urban centre should have something like this.

For me, it was a little more philosophical. I am a believer in establishing the right to roam in our urban centres, especially when it comes to our waterways, shorelines and utility corridors. I believe that the best trips are point-to-point, and not doubling back the way you came. I believe networks should exist to encourage residents and visitors alike to go beyond the known, and explore new places.

But overall, generally, it provides more open space for people in a large, noisy, bustling city. That’s a good thing. And it’s critical on a normal day.

Leave it a pandemic to show us how critical it is.

The spread of COVID-19 and the need to protect the vulnerable is putting pressure on local parks. Playgrounds, dog parks and anything else involving touching or close proximity is closed. The remaining space is what’s left for dense populations to enjoy themselves while practicing physical distancing.

This is where large parks and corridors are a benefit. This is where a narrow and disconnected system is a risk.

At the time of writing, it’s been 18 days since the WHO declared COVID-19 a pandemic, and 12 days since Ontario ordered a shutdown. It seems like many people are doing well to self-isolate and physically distance themselves (with a few idiots amplified by isolated people posting and sharing on social media). As the weeks of continued shutdown continue, I worry about people getting cabin fever and open spaces becoming crowded, fueling a second wave.

But I hope anyone who can’t find enough space in their local ‘hoods can find some inspiration, and go explore other less-trodden paths. I also hope, once we get through this, that we do not forget this lesson and make better open space networks. For the normal days, and if we’re unlucky, the next pandemic.

State of NY v. IJC and the Force of Mother Nature

Disclaimer: This piece is a data analysis and open discussion regarding Lake Ontario levels. The conclusions are not definitive and are editorial in nature. The matters before the Supreme Court of the State of New York are unproven and may be tested in court through rigorous argument, expert testimony, and applicable law.

Flooding on Snake Island, Toronto – May 11, 2019 (see more)

In 2017, Lake Ontario broke height records. Last summer, it did it again. I wrote a piece looking at the full picture of where Lake Ontario’s water comes and goes. In summary major contributors to those record levels were:

  • An extended winter and late spring;
  • Significant spring rain;
  • Significant unregulated flow into Lake Ontario from Lake Erie;
  • Significant unregulated flow into the St Lawrence from the Ottawa River; and,
  • Restricted outflow from Lake Ontario to compensate for the Ottawa River.

It was the coming together of a bunch of factors. There was so much water rushing into the system, and not enough capacity going out, that it filled like a clogged bathtub. New York State, however, thinks that more could have been done. They’re suing the IJC, the bi-national agency in charge of operating Lake Ontario’s outflows at Moses-Saunders Dam near Cornwall.

So I’ve decided to pick up from my previous post, and look at some of the claims.

The Records and the Damage Done

As I wrote previously, Lake Ontario hit a new record monthly average lake height of 75.91 metres (Note 1) last June. That’s 10 cm above the previous record set in June 2017, 15 cm above the record set in 1952, and 1.15 metres above average (Note 2). So in 2017 and 2019, these record high levels caused flooding and erosion on both sides of the lake, including a whack of property damage on upstate New York’s shoreline.

This damage is not just because the lake is generally high. There’s also:

  • Lake surge (or wind set-up), which is a significant tilting of the lake due to wind (see diagram below); and,
  • Waves, which are self-explanatory.

On top of lake levels being a half-metre above average levels, surges and waves can add well over an additional metre of height to the water, and that’s a powerful force to be reckoned with, causing devastating flooding and erosion during a single storm.

The Claims

Paragraph 2 of the lawsuit states:

“In the event of extremely high water levels in Lake Ontario, the IJC’s Dam operation protocol requires the Commission to operate the Dam to provide ‘all possible’ flooding relief to riparian property owners along Lake Ontario upstream of the Dam, subject only to protecting owners downstream of the Dam. During the severe flooding in 2017 and 2019…the IJC chose not to implement its flood relief protocol, which required the Commission to increase outflows through the Dam to the maximum extent possible.”

I don’t know about you, but it seems to me NY State undercut that second sentence with the first one.

The IJC’s ‘Dam operation protocol’ is called Plan 2014, and in a nutshell, when Lake Ontario reaches a certain height, the IJC is able to take certain actions to provide relief to Lake Ontario. This upper trigger varies every “quarter-month” or 7-8 days. Looking at last year’s data, it is true the dam wasn’t opened to full capacity when it reached the upper trigger; between May 7 and June 21, 2019. But again, providing “all possible” protection to Lake Ontario shoreline property upstream of the Dam is subject to protecting downstream properties on the St. Lawrence.

Opening up the Taps

Ignoring the downstream, what difference would it have made to open the dam to max capacity? Would it have been significant? If New York says not opening it up was negligent and the IJC says there was just too much bloody water, this is a good hypothetical scenario to test that.

Under Plan 2014, Lake Ontario would have hit the Upper Limit Trigger on May 7, when it surpassed 75.53 metres. Now, it would have fallen below that the very next day, as the trigger increased to 75.56, and the lake level was 75.55. But I’m going to ignore that. I’m also going to ignore the fact that, in this hypothetical situation, the hypothetical lake level resulting from max outflow bounces above and below the Plan 2014 trigger.

Let’s just assume that, on May 7, 2019, the IJC ignored all downstream impacts and opened up the Moses-Saunders Dam to its max capacity of 10,400 cubic metres a second. What difference would it have made?

Graph of 2019 Lake Ontario Levels, Actual versus Theroetical Full Open Dam Scenario

31 centimetres, or a standard school ruler. That’s how much lower it would have been between June 21 and August 21, when the dam was opened to max capacity anyway, and less so from May 7 to June 21. The lake would have still been 55 cm above average, and it’s insignificant relative to surge and waves (Note 3).

Remember this is a scenario that would have devastated Montreal, which was already grappling with floodwaters, as well as other communities along the St Lawrence downstream of the dam.

What Arguments Hold Water

The theoretical scenario above illustrates a simple fact: there was a lot of water in the system. There’s no way to control how much water comes into Lake Ontario, from Lake Erie and all of the rivers and creeks on both sides of the border. This theoretical scenario also ignores other considerations the IJC has to make, such as potential downstream impacts, ice, hydroelectric plant equipment, and shipping / navigation.

This is consistent with the IJC’s position. From my viewpoint, New York State has a tough case in front of them. As a start, they have to prove that a) opening up the dam to its fullest extent would have made a significant enough difference to the property damages they faced, and b) it would not have significantly impacted downstream communities.

In the face of that challenging argument, it’s hard to see why New York State has gone through the trouble of this lawsuit. Giving them the benefit of doubt, perhaps they do have convincing data to show that extra discharge at the dam would have made a difference. Being really cynical, perhaps they don’t care how downstream communities in Quebec are impacted (the dam is about where the New York border turns east from the river).

But I think it’s political, and I say that with respect.

Paragraph 74 of the lawsuit argues the IJC was negligent because “Among other things, the IJC…chose to prioritize commercial shipping interests over riparian property owners.” That would have been crazy to say back in the 19th and early 20th centuries, when marine shipping was still a major way of transporting goods. But in the 21st century when we have other means to move goods by road, rail and air, I think it’s a fair question to ask if accommodating ships during critical lake conditions is reasonable.

Maybe that still wouldn’t make a huge difference, but it’s a difference nonetheless. And perhaps that’s one reason amongst others to step back, look at the bigger picture, and have a political discussion about how to manage flooding and flows in the Great Lakes basin.

That discussion should also include how New York manages it’s shoreline development. The best way to avoid a flooding or erosion hazard is to avoiding or mitigating the damage before development occurs. How much damage could have been prevented has been the burning question for me.


Note 1: All heights are in the International Great Lakes Datum (IGLD), 1985. Data is based upon measurements at master gauge 9052030 in Oswego, NY, obtained from the NOAA – Great Lakes Environmental Research Laboratory.

Note 2: Averages are for 1917-2016 (100 years). The annual lake average was 74.76 m. Monthly averages are different and vary month-to-month.

Note 3: This is a calculation based upon a surface area of 18,960 km². The difference between the max outflow from the Moses-Saunders Dam and the last outflow change for the dam was applied for each day (i.e. outflow in M3/s, multiplied by 86,400 seconds in a day), for a total volume of discharge for that day. This was then calculated as a height (volume ÷ area), and subtracted from the previous day height. The actual height change that occurred that day was also subtracted to account for inflows and evapotranspiration.

More Reflection on a Westerly Shift

It’s been half a year since I picked up from Toronto, the big city, and moved to the more affordable pastures of Kitchener-Waterloo-Cambridge (“the Tri-Cities”). I’ve covered less than a tenth of what I walked in the T dot, but it’s given me enough time and distance to reflect on how these two regions differ, how the metroscapes have changed.

The History

Toronto was founded as the Town of York in 1793, and has since been a focal point for development as the capital of Ontario, and an economic epicenter of the country. Waterloo County (the predecessor to the Regional Municipality of Waterloo) was settled around the same time, but Kitchener served as the administrative a rural seat for the area. It would be the mid 19th century before they became towns, and the 20th before they were cities.

As such, Toronto has deeper rooted intersections between the natural and built environments. This time piece is critical; the natural environment gets a lot more protection and attention in development planning than it ever did. New development is mostly prohibited where there are wetlands, waterways, floodplains and valley slopes, mostly to protect people or their property from flooding and erosion. But Ontario’s regulatory regime only became strong in the wake of Hurricane Hazel and it’s devastating effects in 1954. Even then, it was mostly focused on waterways and floodplains until encompassing valley slopes and wetlands towards the turn of the century.

This has created a swath of legacy development in Toronto, where houses and commercial/industrial operations had either buried and filled in ravines, or significantly encroached on them before regulation in place. The Tri-Cities on the other hand were more rural in character for some time, took longer to develop, and did so at a lower density and scale. This left more relatively more natural areas intact or unadulterated, at least until more robust protection of ravines was in place.

The Scale

That’s development. Then there’s infrastructure, which is given more priority and leeway to encroach into or near natural areas. It’s still shaped by the same increasing environmental standards over time, but depending on how important that infrastructure is and how much demand there is for it, there may be more money available to make it happen. Toronto’s capital status and greater population and larger economy put it under greater pressure to provide sufficient roadways, highways, subways, railways; ways across and through natural areas. That hasn’t occurred to the same intensity in the Tri-Cities, but it’s there.

The key is that this infrastructure happened earlier in history, and at a larger scale. Massive infrastructure filled in ravines, or led to the complete burial of creeks. By today’s standards, it’s either not worth the cost of the infrastructure required to cross a natural area, or it’s avoided altogether.

The Untouched

Each metroscape also has one major difference: land availability.

There are historic shots of mid to upper parts of Toronto on either side of Yonge Street that seem unreal; the city was still quite rural in the mid-20th century. But by the 70’s and 80’s, new development was punching up to the city’s north border along Steeles Avenue.

Walking in the Tri-Cities in 2020, there are still plenty of rolling farmer fields and freshly carved woodlots on the frontier of development. There are approximately 47 km² of land that are considered “greenfields” within the current urban boundary. This is ignoring development outside of KWC proper, in places like Breslau, the Stockyards, and Mannheim, and it’s entirely possible that these borders could change with annexation. The pressure will only continue to grow as the Tri-Cities grow, and more people like me flock from the GTA in search of more affordable housing.


So the effects are obvious to me when I go exploring the respective metroscapes. Toronto has more natural spaces that have been covered up, constrained, engineered, fractured and/or half restored. This can often make them more interesting; they may be mysterious from an aerial perspective, and hold more surprises when explored in person. Add this to the fact that Toronto has a lake shore and the Tri-Cities does not, and there’s a clear difference in variety.

These unique metroscapes exist in the Tri-Cities too, but significantly modified natural spaces are fewer and farther between. It’s a bit of a double edged sword. Finding an unadultered natural refuge in the Tri-Cities is easier to do than in Toronto. Yet when you find it in a choked, noisy, concrete jungle, that’s what makes it more remarkable and more special. And when you find spaces that are modified to some degree by the built environment, it gives them character, and makes them unique.

This doesn’t make my walks in the Tri-Cities less interesting. There is a moment during every walk, something that raises an eyebrow and makes you smirk. It’s a snapshot that sticks with you, and it adds to your self-constructed image of the city.

That’s why I urge my readers and followers to go beyond living vicariously through me. Go explore these places yourself. Find your moment. My role is to be a guide and inspiration for where to start.

#metroscapes 2019 in review

2019 marked a milestone in exploring local metroscapes. 2018 was the first full year under the new brand, and when my walk planning was starting to get really organized. So this past year was about covering as much ground as I could; I was in the groove, but I had the inkling that this may be my last year in Toronto. I tried to cover off all that I could, but it’s hard being a father and working full time.

While I made some initial reflections of my time in Toronto, I decided to conduct another year-in-review, and bring in some of the ground I covered in the tri-city. I will go over the stats, the neighbourhoods and watersheds covered, and look ahead to the next decade.

Statistics

I did not top 2018’s total walking distance, but considering everything going on in my life, I still covered a good amount of ground.

  • Over 26 walks, I covered 407 kilometres (321 km Toronto / 86 km KWC), a little longer than driving between Niagara Falls and Kingston. This is a decrease of 150 km from 2018.
  • The average walk was 15.6 km, an increase of 1.7 km from 2018. This is the same distance as walking between Keele and Main Street subway stations in Toronto, or between Conestoga Mall and Mill Stations in KW.
  • The longest walk was the last one of the year (December 7), coming in at 23.7 km. This was following the proposed ION Stage 2 route, which is longer than the actual route because of the detours.
  • Most months were an average of 30 km total, the outliers being March (57 km) and June (77 km).

Neighbourhoods

There were 118 Toronto neighbourhoods covered in 2019, 84 of them which were truly walked through, down from 166 and 143 last year, respectively. Half decent coverage of the city, especially Etobicoke and west Toronto-East York North York was a bit of a void. 2 walks went beyond the City of Toronto borders, 3 of them in the Pearson airport area.

As for the tri-city, in which I completed a neighbourhood project for, I covered 41 neighbourhoods, 32 which were truly walked through. Many of them are concentrated along the regional north-south spine, as this happened to be the features I explored. 1 walk went beyond the borders of the tri-cities, when following the Grand’s west bank technically took me through North Dumfries.

Watersheds

Note: A watersheds project for Kitchener – Waterloo – Cambridge is still in progress, so this only reflects watersheds for Toronto walks. This section will be updated once KWC Watersheds is completed.

Last year, I was able to cover all 7 watersheds in Toronto. This year, I technically walked through all of them again, but fewer of my walks traced watercourses.

  • I covered 9 first-order rivers and creeks of 4 main watersheds (Lower / West Etobicoke, Lower / West / East Humber, Lower / West / East Don, East Highland).
  • 10 second-order or lower streams were followed (Black, Lavender and 4 tributaries, Mud, Curran Hall, West Hill and tributary).
  • 1 lost river was traced: Russel Creek, which drained straight into Lake Ontario.

Looking ahead to 2020

2020 will be a big year for exploring the metroscapes of the tri-city. I have lots of opportunities to go beyond the spine I’ve covered so far, and hit the far reaches of each city. In total, I have almost 500 km of walk plans. This includes:

  • 16 in riverine systems
  • 6 in hydro corridors
  • 3 along rail corridors
  • 2 along highways

In addition to that, I still have some unfinished business in Toronto, so I may fire down to the T Dot a couple times to try and cover more ground. This includes checking out some new stuff, such as Garrison Crossing and the new East Don Trail.

Aside from the walks, I have a lot of project work to do as well, and for starters I will finish and publish KWC neighbourhoods. I also have to get my head around KWC watersheds; it’s a bit of a different beast from Toronto, as it will be a number of subwatersheds of the Grand River.

I also hope to figure out a better mapping solution. I have been using Google My Maps as a primary tool, and MapHub for posting and sharing screenshots (since it’s open source). They’re free, which is the primary reason I’ve used them, but both are becoming limited in the scale and capacity I want to use them. I may move to a GIS tool if I have the time and energy amongst the rest of life’s demands.

Thanks for following, and I’ll see you in 2020.

Public Review Update: Toronto’s Regional Trail Strategy

About a year ago, I reviewed a draft version of the Toronto and Region Conservation Authority’s (TRCA) Trail Strategy for the Greater Toronto Region (Trail Strategy). I focused on the parts of it within the City of Toronto, and suggested:

  • Four significant corridor changes;
  • Three alternative connections;
  • Five map corrections; and,
  • Three remaining gaps.

The TRCA published a final Trail Strategy, which was endorsed by their board on September 27, 2019. I’m happy to report that:

  • My suggestion for Scarborough Waterfront West has been adopted;
  • The future Leaside South connection has been illustrated;
  • The Weston North Humber Connection gap was recognized; and,
  • The Finch Hydro Corridor trail will be kept within the corridor across the Metrolinx Uxbridge Subdivision.

It definitely feels good that I was able to lean on my walking experience and create some change in a major planning document. This will help create continuous trails along the waterfront, Humber River and Finch Hydro Corridors. Furthermore, some of the things I raised were (relatively) small scale details that I’m not too worked about.

That said, I am a bit disappointed that three of my large scale suggestions were not taken up.

  • The Crosstown Southwest corridor is the biggest disappointment for me, and is somewhat baffling. It is a natural corridor that would be richer than the bike lanes on Bloor. Furthermore, the middle part between Davenport and St Clair is a formally recognized project by the city, and there is about a kilometre and a half of existing trail west of that. I thought filling in the gap in the Stockyards area and continuing the line past Rockcliffe Boulevard to Etobicoke Creek was a good idea.
  • A trail through Black Creek Ravine also seems like a relatively feasible project, as pretty much all of the approximately 6 kilometre trail would be on existing, publicly owned parkland and open space. The only exception would be a half-kilometre stretch under the Highway 400 / Jane Street interchange, which is still public land, making access negotiable.
  • North Scarborough has this ginournous gap in north-south connectivity. Once again, there are existing segments of trail and most of the ravine is intact. It may be constrained in spots where wetlands are present and a meander belt is protected for, but I think a link to Scarborough Centre should be worth the effort.

Progress is slow and steady sometimes, and the fate of these potential trails is not sealed. So I will take this as a win, and I hope Torontonians will continue pushing for a better trail network.

A Change in the Metroscape

A massive valley with towering apartments on the top of the slope.

The remnance of where a river swept an entire crescent of houses away.

Thick forest followed by a massive train trestle overhead.

A sweeping shoreline leading to a downtown core.

These were the sights along my first walk after moving to Toronto, from Cruickshank Park to the lake. While this was something to occupy myself for the weekend, it started a fascination with how Toronto’s natural and built environments collided.

That said, the walks were aimless and kinda shallow. It wasn’t until November 2017 that it became a brand, and a focused effort to document Toronto’s best walks and biggest opportunities. All in all, from what I could remember back to April 2016, I racked up over 1,300 kilometres over 111 walks.

For now, my journeys across Toronto have reached a hiatus. My housing needs have changed, and I was driven out by the high cost of rent. I have now moved on to new pastures in the tri-city, but I will continue exploring the local metroscapes there.

I thought it worthwhile to take a look back, and make some initial reflections.

2019 in Toronto

2019 was a pretty fruitful year. Despite only completing half as many walks as last year (306 km, or a drive from Toronto to Chatham), I did go further on average (16.4 km; a Lakeshore West GO train ride from Union to Dixie Road). More important than the stats, however, is that I feel like I went on some particularity special walks.

One was certainly the Leslie Spit. Dreary weather can make for a dreary day, but sometimes it makes the colours in the landscape pop a little more. That certainly was the case with the Spit’s brick-laden shores, wetlands in their infancy, tall barren trees and still harbour waters. There’s nothing else like it.

Another was the impeccably timed documenting of The Toronto Islands. This happened about a month before Lake Ontario broke water level records set just two years prior, and ended up becoming an indepth analysis and a new set of knowledge for me.

Finally, there was walking the Beltline, which was a bit of coming full circle. It mixed the midtown trail that was an integral part of my last 4 years in Toronto, and the valley that fills faint memories from the first 6 years of my life. It’s objectively beautiful without context, but it was a very spiritual trip for me.

Looking Back and Forward

I can’t pick those three walks and say they were my top 3 for 2019, or that any of them were the best of all time. Even when I have an incident(e.g. heat exhaustion, falling through ice, or getting lost), every walk has its moment. Despite my bitterness with the circumstances I had to leave under, these adventures will stick with me for years to come.

I’m just happy that I’m able to share all of this. Whether it’s looking up ideas for your own walks, referring to older pictures as the city continues to grow and change, or using analysis to further improve the walking environment of the city, I will strive to maintain this website as a resource for current and future Torontonians.

That said, the Toronto section of the site is not going to be completely static going forward. I still have work to do in the Projects section, and I will return to the city on occasion to visit and take care of some unfinished plans.

So this isn’t goodbye Toronto. More like “See you later.”

The Ins and Outs of Lake Ontario

Note: This post was first published on June 1, 2019 with data available from May 30, 2019. It was updated on June 3, 2019 with the latest data available, and improved graphs. It was updated again on June 5, 2019, July 2, 2019 and February 17, 2020 to reflect new height records and revised data from sources.

In June 2017, Lake Ontario rose to a height not seen in the last 100 years of recorded history. The pictures of how this impacted Toronto were dramatic; flooding parks, eroding shorelines, and boardwalks, beaches and the Islands underwater.

Two years later, we broke records again. Once again, it’s a shocking scene.

The height of water in a lake fluctuates naturally. The amount of rainfall flowing into it, and the rate at which it drains through an outlet (if it has one) is a major determinant. However, it can also be affected by temperature, sunlight, formation / melting of snow and ice, and wind.

But how have we hit crazy high levels within the last two years? Rain, and how much and how hard it falls, is definitely a huge factor. But you may be surprised to learn that its less about the rain that falls onto Lake Ontario’s surface and shores or how hard it fell, and more about what’s happening to the east and the west.

This is a look at where water in Lake Ontario comes from, and where it goes.

The Setup

Lake Ontario basin. From a Report for the International Joint Commission.

First, let’s set this up with some historical context on Lake Ontario’s water level (Note 1).

Prior to 2017, Lake Ontario had only gone above a height of 75.7 metres twice in the last century: 1952 and 1973. It has also only gone below 73.8 metres twice during the same period: 1934 and 1936. Otherwise, Lake Ontario has varied in height within this 1.9 metre range from year-to-year, and season-to-season.

Then in 2017, the previous record set in 1952 was broken by 5 centimetres, with the lake reaching a monthly average height of 75.81 metres above sea level. It was dramatic and visually striking, flooding the Toronto Islands and other shoreline areas on the mainland. The capital repair costs to the city were estimated to total $15.6 million.

This year, the high lake levels are repeating themselves. Most days in June 2019 broke Lake Ontario’s previous daily height record of 75.88 m set in 2017. June 2019 also saw a new record average lake height of 75.91 m, or 10 cm above the previous record set in June 2017.

Looking back makes you realize that in Lake Ontario’s history, a couple pairs of high level years occurring in close vicinity is not unprecedented. 1929 + 1930. ’43 +’ 47 + ’52. ’73 + ’74 +’76. Keep the last two sets in mind next time you’re looking at imprints on Toronto’s bridges and culverts. Same story goes for sets of years with record lows.

Graph of annual minimum, average and maximum levels in lake Ontario, 1918 to present.

What causes the changes in Lake Ontario to swing so much? Do I really need to bust out that graphic from your high school science class showing the water cycle? No? Good.

But as I alluded to, Lake Ontario’s water level isn’t affected as much by the rain that falls near the lake. Below is a chart showing the water balances for the Great Lakes.

As you can see, Lake Ontario’s levels are highly dependent on upstream inflow and downstream outflow (79% and 95% of total inflows and outflows, respectively). The remaining 21% of the total inflow is from water fed from rivers and streams, and 5% of the total water is evaporated (Note 2).

Upstream inflows come from the other Great Lakes, which are fed by rainfall and streamflow. So technically, it makes it an indirect impact. But it’s an important distinction to make. A closer look at where Lake Ontario’s water comes from and where it goes will make it clear why.

Ontario: Last Stop Before the St Lawrence

Lake Ontario is impacted by the fact that it is part of Great Lakes-St Lawrence River system. This means it is fed by water from (going upstream):

  • Lake Erie via the Niagara River;
  • Lake St Clair, via the Detroit River;
  • Lake Huron / Georgian Bay, via the St Clair River;
  • Lake Michigan, via the Straits of Mackinac; and,
  • Lake Superior, via the St Mary’s River.

Water from Lake Erie flows down the Niagara River, and its mostly unregulated, meaning it flows without anything really holding it back (i.e. a dam). Two exceptions are hydroelectric power plants on both the Canadian and American sides, as well as the Welland Canal. However, the power plants are restricted in how much water they take in; the International Join Commission (IJC) is a bi-national agency that has rules to ensure there is enough water flowing over Niagara Falls, so they look pretty and aren’t a pathetic dribble.

Courtesy Ontario Power Generation

Furthermore, they don’t have much capacity to hold what flows down the Niagara River, and they have to let it go eventually. It only manages to change the flow +/- 5%.

The Welland Canal is another pathway for water between Lakes Erie and Ontario. It isn’t a huge factor either; it’s 8.5% of what flows through the Niagara River (Note 3).

Continuing upstream, Lake Huron and Lake Michigan are technically one lake, as they are hydraulically connected through the Straits of Mackinac and generally sit at the same level. The water from them flows unregulated through the Lake St Clair and the St Clair and Detroit Rivers.

Lake Superior is the one major upstream part of the basin that is regulated. Outflow is controlled via three power plants and a 16-gate dam on the St Mary’s River. However, the outflow of Superior pales in comparison to other inputs to Lakes Michigan, Huron and Erie, and even then, any water held back would be a percentage of that outflow.

All that to say Lake Ontario is fed by the other lakes and the rainfall that feeds into them, and there’s really nothing holding it back. So when all of the lakes are up, it can mean a significant cumulative height difference for Lake Ontario.

Outflow: A Balancing Act

Lake Ontario, and all of the water fed into it, flows into the St Lawrence River, and eventually the Atlantic Ocean. But it’s not as simple as draining a tub.

While the eastern end of Lake Ontario is defined as being at Kingston (where it passes both sides of Wolfe Island), there are locks and dams along the way, which widen the St Lawrence River behind them and form ‘lakes.’ These lakes are:

  • Lake St Lawrence, between Kingston and Cornwall
  • Lake St Francis, between Cornwall and Melocheville
  • Lake St Louis, along the west end of Montreal Island.

The key outlet is at Cornwall, between Lake St Lawrence and Lake St Francis, where the Moses-Saunders Dam controls the flow of water. How much water is released is once again determined by the IJC, but unlike the Niagara River, that goal is not making pretty waterfalls. Nor is it just contingent on what is happening to the west. The IJC has to play a balancing act between the height of Lake Ontario and how high the St Lawrence is downstream.

Courtesy ceedub13

Lake Ontario is 19,000 km² and an average depth of 86 m. Lake St Francis and Lake St Louis on the other hand are…not so big. I couldn’t find the figures I was looking for, but it’s in the ballpark of 400 km² and an average depth of 10-20 m (if you got better numbers give me a shout). But the magnitude speaks for itself; the same amount of water has a disproportionate impact on water levels.

Even if Lake Ontario is really high, increasing outflow to reduce its height by a couple centimetres could send downstream communities underwater. So even if the Toronto Islands are underwater and our shorelines are being eaten away by erosion, it’s a small cost relative to the damage that could occur down in Quebec.

Courtesy of the International Joint Commission

Another complicating factor is that the Ottawa River meets the St Lawrence at Lake St Louis. It is a very large river basin which is also relatively unregulated, and it can significantly alter the height of the St Lawrence at Lake St Louis. If there are already high flows coming down the Ottawa River, this put extra restrictions on the flow out of the Moses-Saunders Dam so that flooding in Montreal and other Quebec communities downstream doesn’t occur or isn’t worsened.

Seasonal Impacts

One mitigating factor in all of this is the evaporation off of the lakes. One would think that warm temperatures mean big thunderstorms, and that is a major pathway for moisture to be carried out of the lake. Well, actually it’s quite low.

Courtesy of the Great Lakes Commission

Just as snow melt starts entering the system and the rain begins to fall, evaporation rates nosedive, and whatever goes through a lake’s outflow is the only output of the system. When you put the plug in the tub while the water’s still pouring in, it’s gonna fill up.

The manner in which snow falls and melts can also have an impact on the system. I reached out to a friend who is more academically trained in earth and atmospheric sciences to expand on these effects of seasonal change on lake levels.

“A late start to spring and extended cold weather can delay local vegetation’s break from dormancy. This has the effect of reducing evapotranspiration rates early in the season. As plants take up water, they remove some moisture from the ground which would otherwise end up in local river systems, and eventually through to the St. Lawerence River. 

An extended winter may also delay snow melt timing, resulting in a greater surge of water into the Great Lakes, as opposed to the longer, drawn-out thaw that we are typically used to.

Downstream damming and excessive rainfall are much more significant contributors to lake level issues. Still, evapotranspiration and snow melt play an important part in our water cycle, and all of these factors together may have helped pushed things over the top this year.”

Alex Harris, B.Sc.(Env.), M.Sc. – Ecology candidate

The Perfect Storm

Putting it all together, you get an idea of why 2017 and this year saw crazy high water levels in Lake Ontario.

  • Extended winter and late spring
  • Significant spring rain
  • Significant unregulated flow into Lake Ontario from Lake Erie
  • Significant unregulated flow into the St Lawrence from the Ottawa River
  • Restricted outflow from Lake Ontario

And when you put this in chart form, with the lake level put against the rates of inflow and outflow, it becomes clear how restrictions at the Moses-Saunders Dam can play a large part in raising Lake Ontario’s height.

Between April 18 and May 21, 2019, there was an average of 114.85 million m³ more water flowing into Lake Ontario than flowing out each day. Over 34 days, that makes for a total of 3.9 billion m³ of water. If you didn’t account for elevation, that would be enough to cover the city of Toronto in 6.2 metres of water (Note 4). Accounting for elevation however, that’s enough water to flood downtown Toronto, East York and south Etobicoke (up to the old Iroquois shoreline) with as much as 50 metres of water (Note 5).

The area below the “Iroquois shoreline” (Note 5).

So, a lot of water. Spread out over the entirety of Lake Ontario however, it rose 70 cm, which is enough to impact the entirety of Toronto’s 111 km of shoreline, and thousands more kilometres of shoreline across the rest of the lake (Note 6).

So what are the odds of this happening again? I can’t tell you exactly. I have delivered simplified numbers here, and don’t have a good enough understanding of inter-year and inter-seasonal effects on basin supply and drain.

But based on my knowledge of climate change phenomena, I think the chances are good. Climate change is forecasted to increased precipitation for the Great Lakes Basin, and this may have an impact, particularly if increasingly severe storms means more rainfall runs off into local watercourses instead of being absorbed by the ground and transpired by plants. Furthermore, there is increasing evidence to suggest climate change may increase the frequency and severity of polar vortexes, which could extend winters and delay spring vegetation growth.

So perhaps it’s time to talk about how we manage the inflows and outflows of the Great Lakes. Should we be taking steps to regulate flows out of Lakes Michigan, Huron and Erie? Should we begin to deregulate flows out of Lake Ontario and find another way to mitigate flooding in the St Lawrence?

That discussion would be a geographical (upstream and downstream) and impact-based (net natural, social and economic) balancing act. And that’s way beyond a single blog post or a single year of records.

Notes

1. Lake height measurements are from the National Oceanic and Atmospheric Administration’s master gauges (Superior – Marquette C.G., Michigan – 9099018 | Michigan-Huron – Harbor Beach, MI – 9075014 | Erie – Fairport, OH – 9063053 | Ontario – Oswego, NY – 9052030) and are based on the International Great Lakes Datum, 1985. Monthly/annual maximums, averages and minimums available here.

2. Neff and Nicholas (2005). Uncertainty in the Great Lakes Water Balance: U.S. Geological Survey Scientific Investigations Report 2004-5100, Table 6. Data is from 2003, and a contact at the University of Michigan indicated that it is out of date. A more up-to-date water balance model is available, but I did not have enough time to crunch the data. That said, these figures should provide a good sense of magnitude of importance.

3. Flow rates on the Niagara River and Welland Canal are obtained from Hydrometric Data provided by Environment Canada’s Water Office.

4. Not accounting for elevation, Toronto has an area of 630.2 km² (per StatsCan); taking the volume (of water in lake Ontario) and dividing it by area (of Toronto) equals height (3.9 million km³ / 630.2 km² = 6.2 m).

5. I obtained a simplified line drawing of the shore from BlogTO, eliminated the segment east of Scarborough Heights Park, and converted into a polygon (area is 152 km²). I then employed simplified math to illustrate how much water there is; assuming that this area was a triangular prism, with a height equal to point where the slope starts a significant elevation increases (~130 m above sea level, near Yonge Street and Woodlawn Ave; difference from the lowest point in Toronto of 76.5 metres of 53.5 metres from the shore). The volume of this perfect triangular prism is therefore area * height divided by 2 (152 km² * 53.5 m = 4,066 km³). To reverse-calculate how high the water would be for a different volume of water (e.g. the net flow into Lake Ontario; 3.9 million km³), you can multiply the volume by 2, and divide by the area ([3.9 million km³ * 2] / 152 km² = 51.4 m).

6. Toronto’s shoreline length is calculated based on my previous #shorelineTO work. Lake Ontario’s shoreline length is quoted as 1,020 km, however, this measurement may be subject to the coastline paradox to a greater degree than my measurements in Toronto.