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Frog friendly manhole covers

Every year there are 3 million frogs dying in the dutch rainwater-sewers.
This is because: the holes in the manhole-covers are too big, frogs cannot jump high enough to reach the sidewalk and flush inside the manholes. Once inside, there’s no way back outside. So they’ll starve.
We want to put an end to this madness!
We designed a frog-friendly manhole-cover and introduce this to the towns where the dyingrate is the highest. Frogs are worth saving because they manage the population of insects in the ecosystem. With saving the frogs we bring a bit of balance back to our world.


Marijn Wellner, Neele Schlette

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