Introduction

CHD(Cylindrical Horizontal Drain)is a fully filtered, prefabricated subsoil drainage system widely used around world. It consists of a plastic inner ribbed double core overwrapped with a geotextiles filter fabric. CHD is placed under the surcharge to receive the flow from the vertical drains and conduct it laterally to discharge points at the edge of the surcharge. In most cases the installation of CHD is less expensive than a granular or sand drainage blanket.

Shape and type