Thank you for the explanation. Turns out I stopped reading a little too early: > In order to test the barrier in actual stormy conditions, the water level thre

Thank you for the explanation. Turns out I stopped reading a little too early: > In order to test the barrier in actual stormy conditions, the water level threshold at which the computer system would start the closing procedure was lowered from 3.0 m over NAP to 2.6 m, for the duration of the 2007 storm season. On 8 November 2007, a storm from the northwest hit the Dutch coast. A storm surge, high enough to start the barrier's closing procedure, occurred.