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Objective of CFIS
Dissemination of Flood Level information to the community with a lead time before the flood
- ccurs
Communication and Dissemination of Community based Flood - - PowerPoint PPT Presentation
Communication and Dissemination of Community based Flood - - PowerPoint PPT Presentation
Communication and Dissemination of Community based Flood Information System in Bangladesh Ahmadul Hassan Objective of CFIS Dissemination of Flood Level information to the community with a lead time before the flood occurs Project Location
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SLIDE 3 Jamuna River
Project Location
# Y # Y # Y
GHATAIL BERA MIRZAPUR KALIHATI BHUAPUR SHAHJADPUR GHIOR NAGARPUR BASAIL CHAUHALI TANGAIL SADAR DELDUAR SATURIA SIRAJGANJ SADAR BELKUCHI MANIKGANJ SAD KAMARKHANDA DAULATPUR
J a m u n a R i v e r
Teota Taraghat Sirajganj
Old Dhaleswari River Dhaleswari River Dhaleswari River Dhaleswari River Dhaleswari River K a l i g a n g a R i v e rSirajganj Aricha Toraghat
Sirajganj
55 km 57 km 26 km
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- COMMUNITY
– Information mechanism directly to the community level – Flag and Billboard Network – Improves lead time – Requires little or no literacy – Field tested:
- Calibration
- Local Operators
- Capacity Building
Information and Dissemination
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Need: Format of Information Dissemination
- COMMUNITY
– Billboard Network:
- Predicted flood extent on
high-resolution image of community
- Predicted trend and relative
water level rise
– Flag Network:
- Predicted water level rise
when close to or above danger level
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Information Network Portal
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Conceptual diagram of CFIS
Forecasted WL (FFWC) at u/s and d/s
WATSURF
Observed WLs
SMS flag Msg
Flood map
Community using flood message
GIS maps
Water level measurement Input:
- GIS Riv Networks
- FFWC WLs
Output:
- WL change after 48
hr in terms of ‘Bighat’
- inundation maps
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Topography: Digital Elevation Model (DEM)
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Development of CFIS tool: WL Measurement
- In 2003 – 17 gauges
- In 2004 – 18 gauges
Key water level gauges Gauge 49: Sirajganj Gauge 50.5: Aricha
3111 3111 4116 4116 4112 4112 3117 3117 4101 4101 4115 4115 4113 4113 3107 3107 4110 4110 3108 3108 3109 3109 4119 4119 4104 4104 3105 3105 4118 4118 4102 4102 4106 4106
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Model schematic
Aricha Sirajganj Tora
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Development of Relationships
The lag-time for Sirajganj to reach each individual gauge is estimated by studying the hydrographs before the equation is derived.
72 hours
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Sirajganj, Aricha, Gauge-3109 4 6 8 10 12 14 16
1-Jul 11-Jul 21-Jul 31-Jul 10-Aug 20-Aug 30-Aug 9-Sep 19-Sep WL (m+pwd Gauge-3109 Sirajganj Aricha
Development of Relationships
The lag-time for Sirajganj to reach each individual gauge is estimated by studying the hydrographs before the equation is derived.
48 hours
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Development of Relationships
C1*SirajWL(-24h) +C2*SirajWL(-48h) + C3*SirajWL(-72h) +C4*ArichaWL(today) +B
WL (at gauge) = WL at any gauge in the study area is function of water level at Sirajganj (considering the lag time) and Aricha 15 Equations have been developed for each Gauge
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The Model
Sirajganj WL (FFWC) Aricha WL (FFWC)
Spatial Engine Equations Estimated WL
Map DEM
Msg outputs Msg outputs Msg outputs
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Community flood risk level
Below Normal Flood No Color Normal Flood Green Moderate Flood Yellow Severe Flood Red Flood levels are being marked on concrete pillar
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Community Flood Message
Water level change Flag Description Today flood status Top flag:
No flag, Green, Yellow, Red
No flag – the water level at gauge is at below the Normal Flood level Green – the water level at gauge is within the Normal Flood range Yellow – the water level at gauge is within the Moderate Flood range Red – the water level at gauge is above the Moderate Flood range Water level after 48 hr Except the topmost flag No Flag - WL change < 1 bghat (22 cm) White Flag – decrease of WL Blue Flag – increase of WL
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Model Execution
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Local Level Product List
- 1. District level gauge water levels
- 2. Upazila gauge station water level map
- 3. Upazila gauge station water level table
- 4. Mouza water level forecast table
- 5. Community water level change forecast flag signal
Six types of flood forecasting products from tool WATSURF for dissemination through its network
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Local Level Product – 1 (District)
This product represent flood situation at district level as predicted by FFWC at and around the Tangail and Manikganj
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Local Level Product – 2 (Upazila)
Water level changes in gauges at Upazila level in the form
- f symbols representing rise/fall in local units. The maps
are faxed to the DC and UNO offices
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Local Level Product – 3 (Upazila)
The water level changes in next 48 hrs in Tabular form are faxed to Upazila HQ
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Local Level Product – 4 (Union)
Flood message for all Mouzas within the targeted Union through SMS, and subsequently displayed on bulletin board
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Local Level Product – 5 (Mauza/Community)
Flood map
Flood message for flag site/Mouza through SMS for hoisting warning flags.
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Other Products
- Flag maps using WATSURF
- Flood Extent using RADARSAT Image
- Monsoon Land Use mapping
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Other WATSURF Outputs
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Other outputs
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Flood Monitoring –Local Satellite images used
2 August 2004
Open Water flooding - Extent
RADARSAT Fine Beam RADARSAT Fine Beam images were used to images were used to identify open water extent identify open water extent
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09 July 2004
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02 August 2004
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26 August 2004
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19 September 2004
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Flood Monitoring – Local Aman Map
Bhara Gayhat a Sahabatp ur Mamudnagar Nagarpur Salimabad Duptiar Bhadra Dhubaria Mokna Chak Mirpur Jianpur Khalsi Dhamsar Kalia
RADARSAT RADARSAT Fine Beam Fine Beam images were images were used for Aman used for Aman rice mapping rice mapping
Presentation Layout
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Result Analysis
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Comparison: Prediction vs Observed WLs
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Comparison: Prediction vs Observed WLs
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Comparison: Prediction vs Observed WLs
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Comparison: Prediction vs Observed WLs
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Comparison: Prediction vs Observed WLs
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Comparison: Prediction vs Observed WLs
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Comparison: Prediction vs Observed WLs
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Comparison: Prediction vs Observed WLs
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Model Result vs Observed WL for Flag
74% 78% 75% 71% 75% 86% 78% 79% 75% 75% 74% 76% 75% 83% 82% 10 20 30 40 50 60 70 80 3105 3107 3108 3109 3111 3117 4102 4104 4106 4110 4113 4115 4118 4119 4121
Gauges Number of days
Total Data (days) Days Comply with WATSURF
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G3109: Tebaria 14 19 28 14 19 15 5 10 15 20 25 30 Blue White No Change
Pred Obs Comply % Pred Obs Comply %Pred Obs Comply % Tebaria 61 14 14 100% 19 19 100% 28 15 54% Boro Boinya 57 12 12 100% 16 15 94% 29 15 52% Sunsi 61 9 9 100% 17 15 88% 35 16 46% Kakna 65 14 14 100% 20 20 100% 31 7 23% Total Data Gauge Name Blue No Change White
Model Result vs Observed WL change
Boro Boinya
12 16 29 12 15 15 5 10 15 20 25 30 35 Blue White No Change Sunsi
5 10 15 20 25 30 35 40 Blue White No Change Kakna
5 10 15 20 25 30 35 Blue White No Change
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Post Flood Social Assessment
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Technical assessment (an example)
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Threshold Level at 3111
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RMS error of predicted change in stage(m)
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Difficulties Odds experienced
- Zero value error during gauge connection
- this created a constant vertical offset in hydrograph
- Introduction of error during gauge shifting which caused
erroneous WLs
- Gauge management: in few cases the gauges were found
not vertical due to thrust of floating things, and those were not fixed in time in absence of care and funds
- Error in making SMS message to send WLs
- SMS communication disrupted due to Network failure,
recharging problem and disconnected mobile due to irregularities in bill payments
SLIDE 49
- Technological
– Easy to implement – Simple approach – Less higher skill required
- Institutional
– Society and GoB involved
- Financial
– Implementation cost – Operation & Maintenance cost
CFIS at a glance!
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