ABSTRACT
The implementation of the dike improvement scheme determines the final quality of the dike. Already in the design stage proper attention should, therefore, be paid to all execution aspects. The first step in the execution process consists of excavating the surface soil and making grooves in the dike slopes that require improving. The existing surface soil must be excavated and, as far as it meets the design requirements, set apart so that it can be replaced in the surface of the improved dike. Clay soil is divided into a number of classes on the basis of practical application. It is very important when borrowing clay that the various clay types are excavated separately and, if so required, placed in separate stockpiles. Ditches and deep waterpools, such as scour-holes and oxbow lakes, often occur within the strip of land needed for the dike improvement. Soil placement and heightening preferably take place in the dry.
