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Jakarta Floods Hongjoo Hahm World Bank JanJaap Brinkman Deltares - Delft Hydraulics The World Bank.

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Presentation on theme: "Jakarta Floods Hongjoo Hahm World Bank JanJaap Brinkman Deltares - Delft Hydraulics The World Bank."— Presentation transcript:

1 Jakarta Floods Hongjoo Hahm World Bank JanJaap Brinkman Deltares - Delft Hydraulics The World Bank

2 Jakarta flood management Part 1: The basics - Spatial Planning Part 2: The flood of February 2007 Part 3: No-regret measures Part 4: Tide and High tide floods Part 5: Water specialist center, short-term actions Part 6: Actions and financing structure The World Bank

3 Part 1 The basics: Spatial planning “We live in a changing world” The World Bank

4 Total urban area % (java-bali spatial plan)

5 Total urban area % (java-bali spatial plan)

6 It is really happening Landuse, Jabodetabek

7 It is really happening Urban area, G. Pangrango The World Bank

8 Land-use & Rainfall runoff (Katulampa) m3/s Fast runoff Urban Slow runoff Non-Urban The World Bank

9 Part 2 Flood February 2007 Hydrology The World Bank

10 Daily rainfall Feb 2 Feb 1; 07:00 – Feb 2; 07:00 The World Bank

11 Daily rainfall Feb 4 Feb 3; 07:00 – Feb 4; 07:00 The World Bank

12 Inflow Ciliwung Febr 2007 Katu Lampa - Manggarai Katu Lampa The World Bank

13 Flood February 2007 Hydraulics & Flood extent Unique “Complete upstream-downstream flood modelling framework now available for all major drainage including all 13 rivers” The World Bank

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17 West Banjir canal

18 Part 3 No-regret ST Measures Rehabilitation “Restore original-available design capacity” -Dredging -Dike improvement The World Bank

19 1 August 2007 C: River Embankment Rehabilitation 1. Confirmation of Scope of Works West Banjir Canal – Longitudinal Section The World Bank

20 1 August 2007 C: River Embankment Rehabilitation 1. Confirmation of Scope of Works Cengkareng Floodway – Longitudinal Section The World Bank

21 A: Urgent Maintenance Dredging 1. Scope of Works National Importanc e

22 West banjir canal design

23 No-regret ST Measures “East-Banjir Canal” The World Bank

24 Stepwise approach: A.Cipinang-Sunter-Buaran- Cakung (With increased Cipinang- Sunter capacity) B.Finish EBC-NE stretch C.Optimize Manggarai gate D.Connect with Ciliwung WBC EBC Cakung Sunter Cipinang Manggarai Ciliwung

25 Increase capacity

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27 No-regret ST Measures EBC-CAK-CIL-Manggarai Simulation 2007 The World Bank

28 EBC-CAK-CIL-Manggarai

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30 Part 4 Tidal analysis High Tide floods The World Bank

31 Animation of tide in South China Sea

32 Spring tide analysis Prediction based on analysed tidal constituents Tanjung Priok Only spring tides are plotted Upper plot: 18.6 year cycle caused by eliptical orbit moon Lower plot: semi- annual cycle presumably caused by interaction diurnal and semi-diurnal spring- neap cycle Astronomic tide Sea level anomaly

33 Flood event June 2007 Increase in water level due to MSLA Spring tide (at semi- annual high) flooding reported at June 14, ~10.00 pmFebruary 2007, not exceptional The World Bank

34 Future high spring tides Next semi-annual high spring tide: October 29, November 26, December , January 21 Following semi-annual high spring tide: June 4, 2008  Month with the highest average MSLA! The World Bank

35 November 26, 2007

36 Subsidence The World Bank

37 Land-use change The World Bank

38 Pluit 1989, 2007, 2025 (Positive view) 240 cm Pasar Ikan cm Nov 1989Nov 2007Nov 2025 Nov 26, cm Oct 29, cm subsidence cm Climate change Sea level rise subsidence Critical level 2007 The World Bank

39 240 cm Pasar Ikan cm Nov 1989Nov 2007Nov 2025 Nov 26, cm Oct 29, cm subsidence cm Climate change Sea level rise subsidence 2025: cm increase 18.6 year cycle Pluit 1989, 2007, 2025 (Positive view) Critical level 2007 Sea level Nov 26 The World Bank

40 High tide floods 2007: “Signs of a sinking Jakarta” The World Bank

41 Jadebotabek Water Resources Management Study (JWRMS,1994) The World Bank

42 Part 5 “Strong knowledge base” “Short-term action” The World Bank

43 Flood Hazard Mapping Still a lot of confusion!! –Who is right? –Who is going to solve this? –Who dares to make decision? One storey from specialists required! “Water knowledge center” for DKI - Jabodetabek The World Bank

44 Part 5 Actions and Financing mechanism The World Bank

45 ACTION PLAN Short Term: –Dredging / East Banjir Canal / Manggarai Gate –Stop Ground Water Extraction (industrial) –Early Warning System –Strict Building Codes The World Bank

46 ACTION PLAN Medium Term: –Bulk Water Supply –Stop Ground Water Extraction (household) –Solid Waste Management –Low Income Housing / Slum Improvement The World Bank

47 ACTION PLAN Long Term: –Water Quality –Water Retention Basin / Catchment Area / Sea Defense –Land Use and Spatial Planning The World Bank

48 Jakarta Floods Hongjoo Hahm World Bank JanJaap Brinkman Deltares – Delft Hdraulics Thank you! The World Bank


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