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Management requires measurement: Reducing flood damage by improving response time
Soumya Balasubramanya, Yann Chemin, Lahiru Wijesinghe, Farah Ahmed, Mohamed Aheeyar, David Wiberg
Pilot project in Nachchaduwa
• Objective: To assist the Irrigation Department of Anuradhapura in reducing damages from flooding.
• Challenge: managing competing constraints– Tank needs to be maintained at FSL for irrigation
– Many flashfloods in recent times
– Rainfall information available once a day, as daily average
Pilot project aims
1. Construct IWMI-developed weather stations
2. Install weather stations to address ID’s information needs
3. Document costs of assembling, installing, activating, using, and maintaining mobile stations
4. Understand the cost-effectiveness of using such mobile stations
1. Highlight opportunities and constraints for scaling this solution to the entire country
1. Construct IWMI-developed weather stations
http://www.iwmi.cgiar.org/resources/mobile-weather-stations/
2. Install weather stations to address ID’s needs
• Programmed to send SMS when rainfall >10mm/hr; requested by ID-Nachchaduwa
2. Install weather stations to address ID’s needs
• Weather stations installed in upper catchment of reservoir
• Improves response time to calculate peak runoff
• Can calculate expected inflow into reservoir; create storage space to accommodate runoff
• Can reduce damages caused from reservoir spilling
3. Document costs of mobile stations
Price/Unit(USD) Unit Cost
F08079SerialLogChipOpenSourceDataLoggerModule* 9.50 1 9.50
JSTSHJumper6Wire(GPS)* 2.95 1 2.95
GPSreceiver* 39.95 1 39.95
Weathermeter[1] 76.95 1 76.95
WeatherShieldforArduino* 39.95 1 39.95
RJ11(x2),6pinconnectorforWeatherShield* 1.25 1 1.25
Arduinostackableheaderkit-R3* 1.50 1 1.50
8GbMemoryCard* 6.85 1 6.85
ArduinoMega-CircuitBoards* 8.22 1 8.22
5ASolarControllor* 9.59 1 9.59
SolarPanels* 27.39 1 27.39
MotorbikeBattery* 26.70 1 26.70
Parts* 20.54 1 20.54
Steelstandstructure* 47.93 1 47.93
GSMModule* 30.00 1 30.00
Total[2] 349.25 1 349.25
[1]TobereplacedeverythreeyearsinSL
[2]Entireweatherstationtobereplacedevery10years(recommended)
Equipment
4. Understand cost-effectiveness
• Conservative estimate; assume intense rainfall occurs once every 5 years; assume weather stations replaced every 3 years
• Post-disaster rehabilitation expenditures by government (financial value of damages)
• Run scenarios—with reduction of 10% in post-disaster expenditures due to better management CER =2
• If economic value of damages is considered; then even more cost-effective
Next steps
• Monitor hardware/software to ensure systems are functioning before NE monsoon commences
• Follow up with ID-Nachchaduwa to understand how text messages were used
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Next steps
Thank you!