I-Curb drainage channel iyitshe lomgwaqo elinomsele wokudonsa amanzi ofakwe emaphethelweni omgwaqo, ngakho-ke ubizwa nangokuthi i-drainage kerb. Umgudu wokudonsa amanzi onqenqemeni ungasetshenziswa kuwo wonke umgwaqo oqinile odinga ukugezwa amanzi, njengendawo yokupaka, isiteshi samabhasi kanye nendawo ehamba kancane yezimoto. Izinga elithwala umthwalo wesistimu lingafinyelela ku-D400.
Ukuphakama okuyinhloko kwesistimu yokudonsa amanzi: 305mm, 500mm.