zaterdag 24 december 2011

24-12-2011 10:50 hbos

Weather      : Some clouds / W wind 4 bft/ Rain 3.8 mm
Divers         :Mark / Joris / Axel
Goal           : Measure visibility with baseline measure card and yellow car, Photoshoot, Made fixed photo point
Max depth   : 7.5 mtr
Duration      : 40 minutes
Air temp      : 12 celsius
Water temp : 6.4 celsius
Thermocline : none
Fish            : a cloud of freshwater shrimp near piles.
Plants         : Waterweed (Elodea canadensis) range 1-4 mtr depth, some brown leaves 
Visibility BC*: At 6 mtr depth 7.5,   at 3 mtr depth 10
Visibility YC*: At 6 mtr depth 10.0, at 3 mtr depth 11
Remarks      : < 5 divers in the water.
BC= Baseline viz card.
YC= Yellow viz card. 
The more light there is the less difference you get between BC en YC.

zondag 11 december 2011

10-12-2011 15:22 hrs

Weather     : Cloudy / W wind 3 bft / Rain < 0.05 mm
Divers        : Ted, Gery, Mart, Rick, Jack, Ilya, Mark, Joris, Axel
Goal          : Measure visibility with baseline measure card, find dropoff at 13 mtrs and GPS it.
Max depth  : 14.3 mtr
Duration     : 56 minutes
Air temp     : 4.8 celsius
Water temp: 7.6 celsius minimum
Thermocline: none
Fish           : 1 dead Pike (Esox Lucius), 1 Eal, (Anguila anguila)
Plants        : Waterweed (Elodea canadensis) range 1-4 mtr showing signs of decay. Leafs turning slightly brown
Visibility     : At 6 mtr depth 4.5 meters, at 3 mtr depth 5,0 meters.
Remarks     : < 10 divers in the water.
                   Baseline kickoff dive.
Dive Details : From Paviloen at 150 degrees

zondag 4 december 2011

04-12-2011 13:02 hrs hbos

Weather     : Cloudy / W wind 5 bft / Rain 1.9 mm
Divers        : John, Axel
Goal          : Place marks on 3 and 6 mtr depth on right outer pile of Paviljoen.
                  Measure visibility with baseline measure card and yellow card
Max depth  : 11.0 mtr
Duration     : 43 minutes
Air temp     : 8.4 celsius
Water temp: 8.8 celsius
Thermocline: none
Fish           : none
Plants        : Waterweed (Elodea canadensis) range 1-4 mtr depth no decay
Visibility     : At 6 mtr depth 5 meters, at 3 mtr depth 5,5 meters.
Remarks     : < 10 divers in the water.
The baseline viz meter indicates 2 meters of visibility less than a yellow card. If one's sight is a bit impared than the yellow square suddenly disappears is more easy to read out than a card with the white lines. Maybe a combination of the two type of cards can give a better average of the two measured distances. In this case viz of 6 meters.