Desain Bangunan Bagi Numbak dan Ngerirun pada Sistem Distribusi Air Irigasi Subak Berdasarkan Konsep Pemias

Abstrak

Divider structure (tembuku) numbak and ngerirun is one of structure that used as divider in
Subak water irrigation. Diversion of flow in the tembuku ngerirun was causing reduction that
influenced by the difference speed and makes the difference rate of flow with tembuku numbak.
The purposes of this research were: (1) to determine the level of the pemias coefficient on
tembuku numbak and ngerirun, and (2) to calculate the dimensions of the tembuku numbak and
ngerirun that review by pemias aspects. The real rate of flow analysed by measuring the width
and height of water on the tembuku and the must rate of flow calculated by using the ratio of
irrigated land area. The real rate of flow and the must rate of flow were used to determine
pemias coefficients and pemias coefficients used to determine the must width of the threshold
design of tembuku. Based on analysis, the average pemias coefficient was 0.095 or a value of
pemias reduction was 0.095. Correlation of height of water and pemias coefficient was very
high with R2 was 0.942. RMSE of width threshold value was 38.86%. The must width of the
threshold at Subak is obtained by dividing the real width threshold with (1- pemias
coefficients). After socialized to some pekaseh, they were mostly agree if there pemias
coefficients that can be used to give pelampias on tembuku ngerirun.