Curb drainage channel bụ nkume mgbochi nke nwere ọwa mmiri na-agbapụta n'akụkụ okporo ụzọ, ya mere a na-akpọkwa ya drainage kerb. Enwere ike itinye ọwa mgbochi mmiri na pavement siri ike nke chọrọ ọgwụgwọ drainage, dị ka ebe a na-adọba ụgbọala, ọdụ ụgbọ ala na ebe eji nwayọ nwayọ maka ụgbọ ala. Ọkwa ibu nke sistemu nwere ike iru D400.
Isi elu nke mgbochi mmiri usoro: 305mm, 500mm.