Perched beaches (Figure 56), which combine a low breakwater or sill and a fill, are beaches
elevated (perched) above the normal level. They are suitable where offshore slopes are gradual enough
to permit sill construction in reasonably shallow water at a distance from shore. The perched beach
provides a broad buffer zone against wave action, while offering a potentially excellent recreational
Perched beach sills can be built using most of the materials described for fixed breakwaters. They
must be made sand-tight to retain the beach fill, however. Proper filtering should be provided beneath
and behind the sill to prevent settlement and loss of the retained fill.