31416894artificial water channelsPT2026-03-30 20:52:11UF31416895artificial water channelNDUF31416896artificial watercoursesNDUF31416897water channels, artificialNDBT31381047hydraulic structures by formPTBT31402783man-made hydrographic featuresPTNT31442271canalsPTNT31442273flumesPTNT31442276millracesPTNT31442281sluicesPTNT31442293distributariesPTNT31442297watercoursesPTNT31442284underground irrigation canalsPTNT31442287drainage ditchesPTNT31442290irrigation ditchesPT