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

Abstract

The tertiary channel in the Namu Sira-Sira irrigation is a soil channel. The value of tertiary channel roughness is influenced by some factor, i.e. vegetation level, forming material and speed of water flow. Speed of water flow and forming material will affect the value of the efficiency of water, where both of these factors can be implement through the value of channel roughness. This study aims to determine the value of Manning’s and Chezy’s roughness in the vegetated tertiary channel. At the 3 vegetated soil channel, the Manning’s values are 0,429 ; 0,106 ; 0,778 and the Chezy’s values are 1,698 ; 6,143 ; 0,975.