I am bit skeptical of this kind of analysis - not that I don't believe them that old facilities are much less efficient, just that I think it's a key message that is misleading and is applied to justify the wrong conclusion (that we need
larger, more multi-use facilities so they are cheaper). It does this by confusing a few different concepts related to amenities, age of buildings and cost efficiency calculations.
For example, Quarry Park YMCA and Killarney both have the same sized flatwater pool - 25m x 6 lanes = this works out to about 3,500 sqft of flatwater per facility using 2.5m lane widths. It's not that surprising that a 2010s-built pool would be way more efficient to operate than a 1960s-era one but claiming this through
4x less expensive per square foot is problematic. What's the denominator in cost per square foot they are using?
The Quarry Park YMCA is about 95,000 sqft (layout below). Information isn't available on what's included in the costs, but because they use per square foot I assume they mean total building square foot, or at least the proportion associated with recreation.
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Roughly, Killarney's entire footprint is about 29,000sqft. No information available on the interior square footage.
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As I don't have Killarney layout, let's focus only on the pool itself as they are the same size. Perhaps surprisingly both giant and new Quarry Park and tiny and old Killarney have relatively the same swimming "capacity" of a 25m pool, 6 lanes wide. Compare the relative size of the pools below - my square footage estimate is rough, ignores all the pool deck, hot tubs and other aquatic features, just the physical lap pool:
Killarney = 3,500 sqft pool / 29,000 = 12% of the facility
Quarry Park = 3,500 sqft pool / 95,000 = 3.7% of the facility
So Killarney's pool takes up 3.3x the relative proportion of the square footage compared to Quarry Park YMCA. Assuming flat-water pools are the most expensive "per square foot" to operate in facilities like this, we can lower average costs by attaching anything to them - increase your denominator. Larger change rooms, a running track, hallways - anything has less cost per-square foot than a pool does. Compare the size of the change room on the diagram above to this picture from Killarney's:
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Then layer in the age of the pool and the associated infrastructure maintenance costs - of course it makes Killarney look poor performing! Even if we rebuilt Killarney brand-new with equally efficient, modern pool infrastructure it would still look poor performing on a per-square foot measurement. It's the wrong measure - Killarney offers the same amount of swimming capacity on a far smaller footprint. If anything, it's more efficient, not less that Quarry Park (once you remove the age of building issues).
All this wouldn't matter except for how they talk about using these measure - they are implying that old, small facilities are less cost efficient to build more giant new ones. Great! Except
larger doesn't mean lower costs; newer means lower costs. You could rebuild Killarney in the same footprint with efficient modern pool infrastructure and it would be awesome and way more cost-efficient .... except now we can't fit a "larger, multi-use facility" which is the model we are assuming is the best approach in facility design.
Extend this thinking out a few decades and we have where we are at today - Killarney and the inner city facilities languish and close because they look inefficient and poor performing because they are old. Meanwhile newer, bloated facilities dilute their "per square foot" costs and look better. Over time the quality of amenity gap between old and new increases, because the investment all flows to the new, seemingly more efficient suburban facilities, perpetuating the a cycle - turns out demand is stronger when facilities are newer and higher quality!
The development model becomes so focused on chasing efficiency by building new big facilities it stops knowing how to renovate or upgrade existing facilities, the only option becomes building new big, multi-use facilities with huge footprints. Unfortunately these don't fit in the inner city and hit other efficiency problems (e.g. turns out 10 hectares of land is more expensive in Killarney than in greenfield development).
So facilities start closing when we refuse to pay for a upgraded pool in the same footprint (because it looks cost-inefficient), yet we don't open new facilities because they don't fit (because it's cost prohibitive). Ironically, the actual total cost of providing flat-water pools in different facilities remains reasonably similar this whole time, once your account for age of the infrastructure.