Print Email Facebook Twitter Technical report erosion resistance of grassland as dike covering Title Technical report erosion resistance of grassland as dike covering Author Verheij, H.J. Kruse, G.A.M. Niemeijer, J.H. Sprangers, J.T.C.M. De Smidt, J.T. Wondergem, P.J.M. Corporate name Rijkswaterstaat Project TAW/ENW Date 1997-11-28 Abstract Old dikes are usually still constructed entirely from clay and since 1953 many much heavier dikes have been made from a core of sand with a covering. This construction puts heavier requirements on the covering, as it also does for grassland on a clay layer. These and other developments have led to the need for more insight into the strength of grassland as a dike covering and into the possibilities of managing it better. Regular maintenance is essential for grass coverings and furthermore they are relatively sensitive in their early years to damage; even somewhat older grass coverings sometimes show signs of unexpected damage. They require expenditure to put right and cause doubts about their strength under extreme circumstances. In addition, the Flood Defences Act requires an evaluation every five years of the existing primary flood water defences, of which the dike coverings form an important part. Dike managers have an inclination to put a hard covering on a dike because there is so little insight into the strength of grass coverings, thereby contributing to the reduction of herbage-rich grasslands. As a result, the other functions of dikes, such as the preservation of environment, landscape and culture-history values (abbreviated in Dutch as LNC-values), recreation and agriculture get less attention. Because dikes play a water defensive role before everything, other functions can only be considered if the required erosion resistance of the covering is sufficiently durable. Safety against water is the primary goal, for river, sea and lake dikes. This study has also been aimed at increasing insight into the strength of grassland as a dike covering and on measures that can increase the desired strength. Subject grassdikesleveeswave-structure interaction Classification TPG130510 To reference this document use: http://resolver.tudelft.nl/uuid:446b0289-dad6-4c87-b8cd-bb81128a5770 Publisher Rijkswaterstaat, DWW Source English translation of a TAW guideline Part of collection Hydraulic Engineering Reports Document type report Rights © 1997 Rijkswaterstaat Files PDF TRGrasslandDikeCoverige.pdf 1.31 MB Close viewer /islandora/object/uuid:446b0289-dad6-4c87-b8cd-bb81128a5770/datastream/OBJ/view