Kajian Nilai Kekasaran Saluran Irigasi Tersier Tidak Bervegetasi pada Daerah Irigasi Namu Sira-Sira Kecamatan Sei Bingai Kabupaten Langkat

Abstract

Most of the tertiary irrigation channels in the Namu Sira-Sira Irrigation Network are land channels, where a lot of vegetation still grows in these channels. Vegetation itself can influence several things, such as channel flow velocity and channel roughness coefficient. This research aims to determine and assess the roughness value of unvegetated tertiary irrigation channels. The results of this research for the third time obtained a Manning roughness coefficient value of 0.310; 0.255; and 0.364; for the Chezy roughness coefficient value, a value of 2.409 was obtained; 3,342; 2,064.