as far as I’m aware, the total capacity of all gates at Parteen is 700 m3 per sec to river channel, and 400 to the headrace. This is supposedly more than can flow through Killaloe, hence the level in the flooded section (and the headrace canal ) would have started to drop as the release increased toward maximum. I read this once upon a time in some ESB literature; can’t find it now. But based on reported observations of water overflowing the embankments near Parteen weir, it sounds as if something went wrong. I’ve no doubt the weir could take any level, but I’m assuming the water would start overflowing all the way up the embankments parallel to the Kilmastulla river, which would’ve been quite a sight!!