Routing of local inundation as performed by polder system in east jakarta - repository civitas UGM

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vii

J

ROUTING OF LOCAL INUNDATION AS PERFORMED BY
POLDER SYSTEM IN EAST JAKARTA
Adam Pamudji RahardjoH, Puji Harsant0 2, and Djoko Legonol
ICivil anci FnvilOnmental Engineering Dt::pal'tment, Gadjah Mada University
'Civil Engineering Department, University ofMuhammadiyah Yogyakarta
I

*Email: adam.pamudji.r@gmail.com

Abstract

Jakarta flooding is currently getting more severe and the performance of both
the macro and micro drainage system during the flooding period has never been
investigated intensively. This paper presents the evaluation on flooding at East
Sunter II area, east part of Jakarta, focused on the hydraul ics performance of the
existing system and also the planned polder system and the planned long storage.
Hydrologic and hydraulic routing has been utilized to analyze the dynamics of local
inundation condition in the nearby polder systems. Three rainfall conditions, i.e.
the RIO and the rainfall data of February 2007 and January 2013 floods from nearby
rainfall stations have been applied and its significant inundation performance was
studied. The evaluation criteria if the water surface elevation of the downstream
reach of the Old Sunter River. The model result shows that the two flood events are
comparable to the I Oyr flood. Introduction of two polder ponds and normalization
of the downstream reach of the Old Cakung River appears to solve the inundation
problems of the above floods.
Keywords: flood, dniinage system, long storage, low land, polder.

INTRODUCTION
Flood Problem and Drainage System on Low Land Area of Jakarta

it has already knowil that the Jakarta flooding is currently getting more severe

in several aspects sllch as number of inundation locations, inundation frequency,
intensity, and duratiul1 and unfortunately also the number of affected peoples. The
loss due to 2007 alld 2013 Jakarta flooding was claimed to reach approximately
!DR 8 Trillion and :20 Trillion respectively. So far it has not been investigated
intensively regard ing the performance of both macro system (the thirteen river
systems in Jakarta) and the micro systems (local drainage systems) during the
flooding periods. Compared with that of 2007 flooding, the scale of 2013 Jakarta
flooding was actually still much lower. The inundation areas of both two cases
are shown in Figure I. However, due to the high increase of the economic value
of the impacted areelS , the loss of 2013 Jakarta flooding was significantly high.

Furthermore, it is obviou s lhat the inundation might be caused by insufficient
capacity of drainage systems in accommodating the load due to both heavy rainfall
events in the watershed s>Slem. Studies and proposals for improvement projects
of the macro drainage sysklll of Jakarta have been discussed by local and national
flood mitigation authorities (Nedeco, 1973; Dinas PU DKI, 2009; Pemprov DKI
web, 20 II). However, th

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condition was introducl.'d 11\ l\lllstmcting Polder I and Polder 11 as a retarding basin
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