Modifikasi Persamaan Hidrograf Satuan Sintesis Metoda SCS Dimensionaless Terhadap Hidrograf Satuan Observasi Das Ciliwung Hulu
Abstract: Flood and dryness in
a region watershed happened because of a climate phenomenon, that is rainfall
distribution tend to happened in a brief with high intensity, or drought period
happened longer than normal. Generally the cause of flood is the existence of
input of rainfall and watershed system. Rainfall covers rain factor of stress
intensity, duration rainfall duration and distribution of rain, while system
watershed covers topography factor, soil type, land use and system transfer of
rain in watershed..Approximation of flooding debit which based on torrential
rains can be classified in three ways that is, by the way of empiric formula,
by the way of statistic or probability and by the way of unit hydrographer.
Rainfall and discharge are important thing in getting hydrographer set of
observation and theoretical. The Rainfall that applied is the effective
precipitation which calculation is using index method. Whereas direct overflow
( direct run off) in earning by the way of segregation of total run off with base
flow applies one of three method that is method Straight Line. Hydrographer
ordinates set of observation is gotten by dividing direct overflow ordinate
with effective rain. Synthetic unit hydrograph is an unit hydrograph that
resulted from watershed characteristic, The modification of unit hydrograph SCS
Dimensionless apply to concentration curve (climb curve) and resession curve
(recession curve), with observation of unit hydrograph optimated to Ciliwung
Hulu watershed based on characteristic.
Key word: unit hydrograph, discharge, SCS
Dimensionless
Penulis: Takdir Alamsyah
Kode Jurnal: jptsipildd090047
