The P300 variant encompasses various measures, including the adjustment of the Philipsdam (to enable the inlet of salt water), measures to prevent salt intrusion, the dismantlement of current fresh and salt water barriers within the Krammer sluices and the Bergsediep lock, and the adjustment of the outlet sluice near Bath. Other alternatives that were examined include the p700 alternative and the Zout30 alternative, with a salt inlet of respectively 700 m /s and 100 m3/s. One of the key decisions in the national structure vision is about a proposal to restore the tides in the lake (with a tidal range of 50 centimetres).