Dependable Discharge; Irrigation Water Distribution; K Factor; Water Demand; Water Availability
Abstract
The potential water availability of Bonik Weir needs to be explored in order to fulfill Batuplat's irrigation water needs. The analysis of potential water availability was first conducted using geospatial mapping to determine the catchment area. Evapotranspiration calculations were based on the Penman-Modified study with climate data sources from El Tari Station. The dependable discharge, which represents the potential water availability, was calculated using the F.J. Mock method. This calculation is based on evapotranspiration values and rainfall data from Sikumana rainfall station. The aim is to obtain an initial picture of effective irrigation water distribution patterns based on water availability and demand. The findings of this analysis contribute significantly to the pattern of cropping and water distribution. Rice-corn-fallow is the best option. Optimizing the utilization of water availability at Bonik Weir, by considering the fulfillment of the K factor and water balance based on 15 daily intervals, all planting areas can be optimally irrigated. The first planting season in December 1, a land area of 90 Hectares was planted with rice, while the second planting season in April 1, the area of corn increased by 2.77 Hectares. During the water deficit month in late December - late January, the K factor value is 0.83 - 0.66. Irrigation water distribution pattern can be done in rotation in tertiary channels.