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@Chris_Borneo
As it says in the bit you've highlighted, they're rolled to prevent sharp edges. With the amount of water the tyres spray up inside the guards and the size of those channels, I don't suppose much of it drains through them to the end of the mudguard. Would have thought they'd mention it if it were an intended feature. Also judging by the inside of my SKS, after just a few days wet commuting, I reckon they must get clogged up pretty quick.