At 21:51 water level is 0.02m and it will keep falling by 0.02m until the low tide at 00:56
The low tide with 0.0m is 0% of the lowest astronomical tide (-0.17m)
At 21:51 water level is 0.02m and it will keep falling by 0.02m until the low tide at 00:56
The low tide with 0.0m is 0% of the lowest astronomical tide (-0.17m)