Perbandingan Hidrograf Satuan Teoritis Terhadap Hidrograf Satuan Observasi DAS Ciliwung Hulu
Abstract. Flood and dryness in a region watershed was caused by a climate phenomenon, that is high intensity rainfall distribution or longer drought period. Flood is the existence of rainfall input and watershed system. Rainfall covers rain factor of stress intensity, rainfall duration and rain distribution. System watershed covers topography factor, soil type,land use and rain system transfer in watershed. Flooding debit approximation based on torrential rains can be classified in three ways such empiric formula, statistic or probability and unit hydrographer. Rainfall and discharge are important things in getting observed and theoretical hydrographer set. Applying Rainfall is the effective precipitation calculated using index method. Whereas direct overflow (direct run off) was earned by total run off segregation with base flow applies Straight Line Method. Observed Hydrographer ordinates is created by dividing direct overflow ordinate with effective rain. Observed unit hydrograph result was compared with teoritic unit hydrograph and calculated by using Least Square Method, Forward Subtitution Method and Linear Reservoar Cascade Method. Comparation was done to Time base (Tb), Time peaks (Ts), Q peak.
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