Flood Disaster Mitigation as Revealed by Cawang-Manggarai River Improvement of Ciliwung River
Abstract: Ciliwung River that
flows from Bogor highland is one of the rivers traversing several lowlands in
Jakarta. Having the lowland topographic condition, the area along Ciliwung
River is potentially inundated. Flood disaster that occurred in early 2002 in
Jakarta caused a wide inundation area (with approximately 25% area of Jakarta
Province being flooded), serious damages in properties, and also loss of life.
This paper presents hydraulic routing analysis over Ciliwung River within
the Cawang - Manggarai reach through several scenarios and further simulation
using of HEC RAS 3.1 version Software. From the several scenarios and
simulations, a conclusion among scenarios which results the lowest water
surface elevation was withdrawn.
The final result of this simulation shows that Scenario 3 gives the
lowest water surface elevation profile. Scenario 3 is subjected to river
normalization, revetment works along the river, and also flood control
structure improvement through the additional sluice gate on Manggarai Barrage.
This scenario results 167 cm, 163 cm, 172 cm, 179 cm, 167 cm and 171 cm or
17,60%, 17,16%, 18,09%, 18,76%, 17,38% and 17,72% of maximum water level
reduction respectively over cross section number S 20 to S 25, for several
simulations with 100 year of design discharge.
Author: Airlangga Mardjono
Journal Code: jptsipilgg130029