At 20:18 water level is -0.12m and it will keep falling by 0.03m until the low tide at 21:30
The low tide with -0.15m is 20% of the lowest astronomical tide (-0.74m)
At 20:18 water level is -0.12m and it will keep falling by 0.03m until the low tide at 21:30
The low tide with -0.15m is 20% of the lowest astronomical tide (-0.74m)