School Made Sampling Field Studies Equipment
1. Sounding Line
used to measure the depth of a water body.
• Use a hack saw to cut a complete construction brick in half.
- ½ red construction brick
- 4' eyebolt with nut
- 2 washers
- nylon cord
- snap or clip
• Drill a hole in the brick using a masonry drill.
• Place one washer on the bolt and put it through the hole in the brick, add the second
washer and tighten the nut.
• Securely attach the nylon cord to the snap or clip.
• Mark the cord at one meter intervals to a length of 10 15 meters depending on the areas
you plan to visit.
• The clip on the line can then be attached to the eyebolt and also removed and used with
• Use: Lower sounder into water until it touches the bottom and record the amount of line
2. Secchi Disk
used to measure turbidity of water.
- 3 - 4 large aluminum can lids
- Place duct tape around edge.
- Drill a hole in the center
- Put rope through hole and secure
- Use: Lower secchi disk into water until it can no longer be seen. Record the
depth. A more accurate reading can be found if this process is repeated several
times and an average is taken. If the water is cloudy or has a large amount of
suspended solids in it sunlight will not penetrate into the deep water.
3. Collection Nets
used to collect samples of organisms in water.
- nylon stocking or cheese cloth
- coat hanger
- broom stick
- Assemble items to create a net as shown in diagram at right
4. Coke Bottle Sampler
used to collect water samples for chemical tests.
• Mix epoxy and use it to attach weight to bottom of bottle.
- 32 ounce Coke bottle
- 4 pound weight
- #2 single hole rubber stopper
- 2' eyebolt with 2 nuts
- 15' nylon cord
• Place one nut on the eyebolt and place it through the hole in the stopper.
• Securely attach the other nut.
• Tie one end of the cord securely to the neck of the bottle.
• At 6', tie the cord to the eyebolt.
• Tie a loop in the free end of the cord.
• The sounding line is attached to the loop.
• Use: Place stopper into bottle and lower to desired depth. Pull with a jerking motion
on the cord to open bottle. Allow time for bottle to fill and bring sample up.
Printed with permission from Michal L. Le Vasseur, 2001
School Made Sampling Field Studies Equipment (Adobe PDF document)