The analysis of water loses in the secondary channels of Bissua irrigation Mahmud Achmad (a), Samsuar (a), Reski Maulidya (a)
(a) Department of Agricultural Engineering Faculty of Agriculture Unhas
Jl. Perintis Kemerdekaan KM 10 Makassar 90245, Indonesia
Abstract
The purpose of this research is to analyze correlation between water efficiency, water loses and channel density in the secondary channels of Bissua irrigation and figure them spatially. Channel was sampled purposively for different dense of channel in the area based on irrigation channel map. The water inflow and outflow were measured in the selected segmented-channels. Discharges, evaporation and seepage data were used to determine water loses and their efficiencies. Spatial mapping was processed using ArgGIS 10.4 to figure the location of channels with their value of efficiencies and loses. The result shows that loses and efficiency range from 1.2 to 4.7 x10-4 m3/s/m and from 40 to 90%, respectively. With the variation of channel density from 0.03 to 0.25 km/km2, it was found that there was negative exponential correlation between water efficiency, water loses and channel density. In addition, water loses also have positive correlation to the width of channels.
Keywords: channels density, irrigation, efficiency, and, water loses
