but like posts here with greengrocers apostrophes,
ahem, or with missing apostrophes!
Back to topic, one has to bear in mind that the standard of English literacy in SA has dropped since 1994 and the report may well have been drafted by engineers and then given to others to edit and produce the final copy. Any of those people might not have been native English speakers (SA has 11 official languages although only 3 are significant in the Western Cape).
I read the report and whilst I'm not an engineer I do have some technical knowledge and this seems a classic case of multiple factors, or 'holes in the cheese lining up.'