A seawall gains places that hold the tide
Vertipool adds small water-retaining structures to hard coastal defences. A pool stays wet as the surrounding surface is exposed at low tide. That adds a feature that a plain seawall can lack, without taking away its primary engineering role.
GB United KingdomIn practice. Artecology adds water-retaining pools to hard coastal structures to provide intertidal refuge.
What to keep in view
Colonisation at a particular site does not establish a wider biodiversity effect.
A pool stays when the tide moves out
The value of the pool depends on its location and the organisms able to reach it. Observing what colonises one installed pool can support a claim about that site. A wider conclusion needs observations across sites and conditions.

