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SLACK WATER

The North Coast of Cornwall is exposed to such strong currents that good dive planning is essential, as most sites can only be dived at slack water. On 4th August 2007, two divers from a visiting club were lost for several hours after diving the well known St Chamond (“Train Wreck”) near St Ives, having apparently mis-timed slack water. Thankfully, after a search involving two lifeboats, an inshore lifeboat, a helicopter and several other vessels in the area, the divers were safely recovered by a passing fishing boat several miles from their point of entry.

To attempt to help dive planning we have tabulated our observations regarding slack water at stated dive sites on dates we have dived there. Although many sites have very limited information at present, we hope to record and add more information in future seasons. Although we hope that this data will prove useful in conjunction with thorough dive planning, there is no substitute for proper assessment of conditions on the day. 

Dave Jenkins
Chairman, Penzance Diving Club
 

NORTH COAST - OBSERVATIONS OF SLACK WATER AROUND HIGH TIDE

High water times refer to St Ives and tide heights refer to Newquay, both taken from the yellow-covered tide tables published by Holidaymaker Publications www.holidaymakerpublications.co.uk 

Site Date HW height (m) LW height (m) Slack commenced Length of slack (min)
Enrico Parodi 04-Aug-07 6.5 1.0 HW+5' <40
           
Gemini 17-Jun-06 6.0 1.5 HW+15' 55
           
Helene 15-Jul-06 6.7 0.9 HW+20' 50
Helene 08-Jun-07 5.6 1.9 HW+10' 75
Helene 05-Jul-06 5.3 2.6 HW 90
           
Kintuck 12-Jul-06 7.1 0.7 HW 40
Kintuck 29-Jul-07 6.6 1.2 HW 40
Kintuck 18-Jul-04 6.5 1.4 HW+10' 45
Kintuck 09-May-04 6.2 1.3 HW+15' 40
Kintuck 07-Jul-07 6.1 1.7 HW+10' 45
Kintuck 23-May-04 6.0 1.6 HW+10' 50
Kintuck 11-Jul-04 5.4 2.4 HW 90
           
St Chamond 19-May-04 6.4 1.0 HW+25' 40
St Chamond 09-Jun-07 5.6 1.9 HW+15' 60
           
Zone 15-Jun-07 6.7 0.7 HW+15' 45
Zone 15-Sep-07 6.6 1.1 HW+15' 50

NORTH COAST - OBSERVATIONS OF SLACK WATER AROUND LOW TIDE

Low water times refer to St Ives and tide heights refer to Newquay, both taken from the yellow-covered tide tables published by Holidaymaker Publications www.holidaymakerpublications.co.uk 
Site Date LW height (m) HW height (m) Slack commenced Length of slack (min)
Enrico Parodi 12-Aug-07 1.1 6.7 LW-30' <30
           
Helene 15-Sep-07 1.1 6.6 LW+10' 60
Helene 08-Sep-07 2.0 6.2 LW-15' >75
           
Kintuck 14-Jul-07 1.2 6.8 LW  >60
Kintuck 11-Aug-07 1.4 6.4 LW 50
           
Pandora 10-Jun-06 1.2 6.2 LW-30' 90
Pandora 15-May-04 1.3 6.0 LW-30' 90
           
Princess Royal 28-Jul-07 1.8 6.2 Before LW-20' >80
Princess Royal 28-Jul-04 2.1 5.9 Before LW-40' >90

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