Coastal Planning of Jakarta Waterfront - Pratama Rizqi Ariawan.pdf

Integrated Coastal Planning of Jakarta Waterfront

(Assignment week 4)

Student : Pratama Rizqi Ariawan

Student ID : 20012611419010

Lecturer : Ir. Ari Siswanto, MCRP, PhD

Subject : Integrated Aspect of River, Lowand, and Coastal Management

Course : Double Master Degree of Integrated River, Lowland, and Coastal

Development and Management Planning

Due Date : 25 August 2014

Pratama Rizqi Ariawan Sriwijaya University

Page 2

Background - Coastal Condition

Jakarta, capital city of Indonesia, has suffered by flooding for many years. Land

subsidence due to groundwater extraction is a major cause of the flooding problems. But

subsidence is not the only cause for Jakartas water problems. No fewer than thirteen

rivers that flow from the hinterland into Jakarta Bay have worsened inundated areas all

over Jakarta city, especially in its waterfront, the north Jakarta.

Figure 1 Land Subsidence in Jakarta in Period 1974-20101

Moreover, global sea levels have risen at a rate of about 1 to 2 millimeters per year on

average, and this rate is expected to increase to 5 millimeters per year by 2050. A study

by ITB showed that the sea level in the Jakarta northern coastal region rose at a rate of

5.7 millimeters per year.

Spatial Planning The Giant Seawall

Integrated coastal planning is the best solution to protect Jakarta from flooding for the

next hundreds years. Therefore, the Government of Jakarta city has proposed to build

giant seawall or polder, a low-lying tract of land enclosed by embankments (barriers)

known as dikes that forms an artificial hydrological entity, meaning it has no connection

with outside water other than through manually operated devices2.

Based on Presidential Decree number 54 year 2008 about Spatial Planning of Jakarta,

Bogor, Depok, Tangerang, Bekasi, Puncak, Cianjur, and also Medium Development Plan

2013-2017 by Local Legislative, it is mentioned that the government has approved the plan

to build the project.

1 Source: Coordinating Committee for Geoscience Programmes in East and Southeast Asia, 9 Nov 2012 2 Source: Wikipedia.org

A recent study concluded that land

subsidence in Jakarta accelerated at

an alarming pace in the past four

decades, and if no remedial

measures were taken, the northern

part of the city could sink below sea

level in the next decade. It is

predicted that several areas in the

northern coastal region of Jakarta

will subside by 60 centimeter by

2020.


Page 3

Figure 2 First Stage of The Giant Seawall Construction

It is expected that the flood protections can also be used for fresh water reservoirs,

wastewater treatment plants, extended port developments, luxury resorts, and also

railway and roadway connections within east sector (Bekasi) to west sector (Tangerang)

with approximately 30 kilometres long.

In planning this future project, the Government of Jakarta city has proposed three

different schemes to construct the giant seawall; however, only the best one will be

constructed which meets economic value and more functions, as can be seen as follows:

1. First scheme involves integrated seawall with reclamation of north Jakarta bay;

2. Second scheme involves integrated seawall forward to the deeper sea (-16 m);

3. Third scheme involves integrated seawall connecting the thousand islands.

Figure 3 Proposed Schemes of Integrated Giant Seawall


Page 4

Figure 4 The New Perspective of The Capital City of Indonesia

Problems of Actual Conditions

Flooding has always been a problem of Jakarta coastal bay. To reduce or to prevent the

flood, some flood protections have been built in the past, however, those protections

cannot be last longer. A number of dikes constructed by the city, including in Muara

Angke, Muara Karang, Pluit, Cilincing and Marunda, are no longer capable of holding back

the water. Jakarta needs to build bigger retention ponds to hold excessive water from

both the river and the sea. However, there is no available area to build the ponds in the

increasingly expensive land, so taking further the waterfront is the only option. However,

in constructing the project, there may be some other problems related to the finance, and

environment.

Some Critics Related to Spatial Planning

This mega project seems to be an ideal solution to solve flood problems in Jakarta and

subsequently gives other benefits in improving spatial planning as well. However, there

are some other questions related to the construction of this project, as follows:

Cost

Investment cost is always being the biggest problem in every development. To build an

approximately 30 kilometers long and more than 16 meters deep of giant dikes will cost

more than 200 trillion rupiah. Although the government of Jakarta city has the fund, but

cost sharing with or fully granted by private sectors will be a better option.

Operating, repairing and maintenance cost can be the other challenges, to maintain the

water level in low-lying areas there is no other option other than using pump. Instead of

using electric pump, wind powered pump can be used to reduce the cost.


Page 5

Time

To build this mega project, undeniably will take long time. It is predicted that the

construction will be finish in about 10 years. Not to mention for the development of fully

available facilities including the freshwater reservoir systems, the wastewater

management plants, roadway connections, railway tracks, deep seaports, luxury resorts or

even luxury yacht harbors will take couple of years.

Environment

The giant seawall is designed to be a fully enclosed to make it easier to control the water.

This however will reduce quality of water and will lead to marine ecosystem degradation.

Alternative Solution Instead of building the giant seawall for either preventing or reducing the flood, it may be

better to conserve the upland areas so that the runoff water can be minimized, dredging

the silts and elevating the river embankment to maximize the capacity, using the river

easement wisely, cleaning the river of rubbish to prevent clogging of the waterways, and

building the dikes alongside the coastline may be cheaper, faster and last longer rather

than constructing this ambitious project.

Conclusion

Flooding has laways been a problem of Jakarta city, moreover mixing of 13 rivers and high

tide of sea water level have worsened the flood. Recent development of Jakarta coastal

defence cannot be last any longer. Integrated coastal planning of Jakarta waterfront is

one of the sustainable way and also give other uses in spatial planing. However, the cost

of the project, the time to construct and the impact to the environment have made this

project even harder to be realized.

References

1. Eko Priliawito, et al. 2011. Contoh Belanda, DKI Bangun Tanggul Raksasa.

http://www.skyscrapercity.com/showthread.php?t=1316051. Accessed on 20 July

2014.

2. Erna. 2013. Pembangunan Giant Seawall Dipercepat.

http://www.jakarta.go.id/web/news/2013/11/pembangunan-giant-sea-wall-

dipercepat. Accessed on 20 July 2014.

3. The Jakarta Post. 2011. Jakarta to Have Giant Seawall by 2025.

http://www.thejakartapost.com/news/2011/02/08/jakarta-have-giant-seawall-

2025.html. Accessed on 20 July 2014.

Documents

Coastal Planning of Jakarta Waterfront - Pratama Rizqi Ariawan.pdf