Snijder worked on the Ada Sea Defence Project in Ghana. The coastline of Ada needed a bank protection due to increased erosion. In forty years, about 450 metres of sand and soil have been washed away in some areas. Groynes are needed to block the sand from washing away continuously by the current.

The groynes are parallel to the beach: every 700 metres there is a groyne in the sea. The first one is 300 metres long and from then on they become shorter and shorter. They are four metres high from the seabed. The first 75 metres are dug into the ground.