Fill out the rest of the hours
Mark heights of HW and LW
Draw a line between them
Next Problem
What will be the height of the tide at
1020 on Wednesday 16th October?
1020 on Wednesday 16th October?
First - since daylight saving is active, the times
in the table are 1 hour behind DST.
Enter 0852 at HW in graph below.
in the table are 1 hour behind DST.
Enter 0852 at HW in graph below.
Cont.
Rep.
0852
0752
0652
0552
0452
0530
1218
0952
1052
1152
1252
1352
Start
Now decide if to use Neap or Spring Curve.
Subtract HW from LW. 3.3 - 1.0 = 2.3
Compare to Mean Ranges and use closest.
In this case use Neaps curve.
Subtract HW from LW. 3.3 - 1.0 = 2.3
Compare to Mean Ranges and use closest.
In this case use Neaps curve.
Now find 1020 on the bottom scale.
Each tick = 10 mins.
Each tick = 10 mins.
Draw a line up to the Neap curve
and across to meet the HW/LW line,
then up to the HW scale.
and across to meet the HW/LW line,
then up to the HW scale.
The tide height at 1020 DST will be 3.0m
Between what times will the tide height
be 2m or above on the same day?
be 2m or above on the same day?
Draw a line down from 2 m on HW scale
to the HW/LW slope. Then across the
tide curve. Then down to the time scale.
to the HW/LW slope. Then across the
tide curve. Then down to the time scale.
Ans between 0530 and 1218