The sand martin breeds in colonies in steep banks by lakes, marshes, rivers and sandpits. Flying low over the water, it hunts insects. It generally uses walls that have formed naturally. In several cases, however, human hands have built a sand martin wall because the bird’s natural biotope is increasingly being threatened. For a short time now Woerden (NL) has also had such a wall – thanks in part to the use of TenCate Polyfelt® Rock PEC.
Rock PEC was developed in order to combine functions such as reinforcement, separation, filtration action and drainage in a single product. By combining reinforcement and drainage, Rock PEC is the perfect product for the reinforcement of this construction.
The wall in Woerden was built in March 2008 using poorly draining ground and it now offers 110 pairs of swallows a place to nest.