Mohammad Bisri, Lily Montarcih Limantara, Laksono D. Nugroho
This study aims to establish the model of Dimensionless Synthetic Unit Hydrograph at Gendong Watershed, Pasuruan Regency-East Java Province of Indonesia. The observed data of Automatic Water Level Recorder at Gembong Warungdowo was used in this research and the Automatic Rainfall Recorder at P3GI (Sugar Factory Central Research of Indonesia) from 2008 until 2011. The model was differentiated by using the Collins Method. The result showed that the suitable model at Gembong watershed is as follow: the rising limb curve is Qn = Qp + 0.615 (t-Tp) and the recession line curve is Qt = Qp x e0.30 (TP-t). This result was based on the regression statistical analysis with the highest correlation of R2=0.993 and the standard error minimum of SEY=1.143 for the rising limb curve, however, for the recession line curve is R=0.906 and SEY=0.415. The model is as follow: the rising limb is Qn = Qp + 0.615 (t-Tp) and the recession line is Qt = Qp x e 0.30 (TP-t) . © 2018, Int. J. of GEOMATE.
Department of Water Resources, Faculty of Engineering, University of Brawijaya, Indonesia
