APPLICATION OF SIMPLE HYDROLOGIC MODEL FOR RECALCULATING WATER BALANCE OFCACABAN DAM SYSTEM
Sukirno
Staf member at Faculty of Agricultural Technology, UGM Yogyakarta
sukirnosiswo@yahoo.com
Sahid Susanto
Staff member at Faculty of Agricultural Technology, UGM, Yogyakarta
s_susanto@ugm.ac.id
A B S T R A C T
Simple hydrologic model of Mock is basically of rainfall-run-off model containing three tanks arranged in vertical position. Six parameters in the model were analyzed by trial and error. The aim of study was focused in application of the model to recalculate water balance at Cacaban dam irrigation system. Cacaban system located at Central Java was constructed mainly for supplying water to irrigate 6628 ha of land. The period year of 2007-2008 was used for the application of the model to predict water availability at the dam and water demand for irrigation was calculated based on various cropping pattern.
The result shows that the model can perform well. Water availability at the dam has decreased significantly in the recent year. In the same time, water demand for irrigation in dry season has increased. Calculated deficit water in the dry season has also increased. Optimizing water balance then was recalculated using modification of the cropping pattern presented by the various value of K meaning half monthly fixed coefficient of irrigation services, ranging from 0.3 to 0.5.
Key words: hydrologic model, water balance, water availability, water demand for irrigation
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