The way I see things we've not actually got a decent way of measuring canopy
cover, so precisely how anyone's gonna manage to define what 20% is and how
to achieve it I've no idea. Certainly there are neighbourhoods round here
where they'd love to get down to 20% canopy cover, and a street round the
corner could fairly happily fell alternate street trees and canopy cover
would still be 75% which seems to suggest that canopy cover currently stands
at 150%, which can't possibly be correct.
Perhaps a measure of total crown volume per hectare might be a possibility?
But you just know that some bright spark would try to achieve it by growing
100 metre tall fastigiate trees......
And while we're thinking about this the Mulberry that grows in my back garden
set off the year providing about 20% cover over my garden, now it seems to be
covering about 40%. I strongly suspect that trying to specify percentages of
canopy cover with things as dynamic as trees is always going to be an
impossible task, especially in densely populated cities.
Perhaps as Jon implies (or as I'm inferring) the best way is to specify areas
of green space and then let the trees develop as part of that.
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