Tidal Data for 12 Oct 1216 at the Wellstream.
Time (hrs after midnight) Height (metres) Time (hrs after midnight) Height (metres)
00.00 2.43 13.00 2.03
01.00 3.01 14.00 2.97
02.00 4.33 15.00 4.73
03.00 6.15 16.00 6.73
04.00 7.76 17.00 8.13
05.00 8.50 18.00 8.48
06.00 8.23 19.00 7.88
07.00 7.22 20.00 6.63
08.00 5.78 21.00 5.04
09.00 4.25 22.00 3.55
10.00 2.98 23.00 2.54
11.00 2.19
12.00 1.85
Tidal Range for the day = 6.65 metres. High water occurred at 05.10 and 17.50 GMT. Low water occurred at 12.00 noon and 23.30 GMT.
Mean sea level, the centre of the oscillations, is ALWAYS 2.56 metres above Crabb Hole. The figures above however are the readings vertically above Newlyn as is customary. They must therefore be adjusted by first calculating the figure for the centre of the oscillation in the above table, and then calling that figure 2.56 metres above Crabb Hole.
Sunrise occurred at 06.33 hrs GMT. Sunset occurred at 16.55 GMT. Civil twilight (morning) began at 05.58 GMT and ended at sunrise. Civil twilight (evening) began at sunset and ended at 17. 30 GMT.
Moon phase: New, i.e. no moonlight.
The account of Roger of Wendover
Above: Data regarding the reclamation of the Wellstream. (* ... five feet would be obtained).
The Historia Anglorum account.
Above: Map showing the various stages of the reclamation of the Wellstream estuary.
Above: This source (the part I’ve underlined in red) led to my rediscovery of the tidal surge which engulfed the baggage train.