HHD - Catalog

HHDR(Harmonica type horizontal drain) is a fully filtered, prefabricated subsoil drainage system widelyused around world. It consists of aplastic inner Harmonica core overwrapped withageotextiles filter fabric. HHDR isplacedunder the surcharge to receive the flow fromthe vertical drains and conduct it laterally to discharge points at the edge of the surcharge. In most cases the installation of HHDR is less expensive than a aggregate or sanddrainageblanket.