Introduction: DIY Bridge Trawl

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Trawl for dangling from a bridge or other location above the water.

Made from a 5 gallon bucket rim, and a recycled bottle for weight.

Step 1: Supplies

Picture of Supplies

You will need the following supplies :

1) Rope

2) 2 Worm gear clamps

3) Paint Filters (1 Pack)

4) 5 liter Paint bucket

5) A used plastic water bottle with thin neck

6) Pebbles

Step 2: Cut the Top of the 5 Liter Bucket

Picture of Cut the Top of the 5 Liter Bucket

Step 3: Adjust and Fit the Worm Gear Clamp on to the Bucket

Picture of Adjust and Fit the Worm Gear Clamp on to the Bucket

Combine two worm gear clamps to fit the diameter.

Adjust and tighten the clamp on to one side of the ring

Step 4: Drill Holes on the Top and Bottom of the Ring

Picture of Drill Holes on the Top and Bottom of the Ring

Make sure the holes are aligned to each other

Step 5: Attach the Paint Filter and the Bottle

Picture of Attach the Paint Filter and the Bottle

1) Tie the rope from the bottom hole (3-4 inches in length)

2) Fill up half of the bottle with pebbles and the rest with water

3) Tie the other end of the rope to the neck of the bottle

4) Attach the paint filter and tighten the clamps

Step 6: Tie Rope to the Top Hole of the Ring

Picture of Tie Rope to the Top Hole of the Ring

Finally, tie the rope to the top hole of the ring (length depends on the height of the bridge)

Step 7: You're Ready to Trawl Over a Bridge!

Picture of You're Ready to Trawl Over a Bridge!

Step 8: Process Samples

Picture of Process Samples

Check out how to process the samples collected.

https://www.instructables.com/id/Citizen-Science-Processing/

Comments

Jobar007 (author)2016-10-03

How long did you keep your trawl in the water to get it to collect that much gunk?

Testourwaters (author)Jobar0072016-10-05

Hey! We kept the trawl in the water for about 15 minutes. You can find more details on our blog : http://www.testingourwaters.net/blog/

We are also in the process of updating out trawl finds on our website!

DIY Hacks and How Tos (author)2016-10-02

Great project. Do you do this to remove trash or for testing?

Thank you! We are testing the water for plastic. We design DIY trawls for citizen scientists to make and use in their nearby marine environments thereby reducing the accumulation of plastics through active community engagement.

About This Instructable

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Bio: Empowering citizen scientists to track and together prevent marine pollution.
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