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International Workshop on Flash Floods Forecasting 13-17 March 2006, San Jose, Costa Rica

International Workshop on Flash Floods Forecasting 13-17 March 2006, San Jose, Costa Rica. Development of Equipment for Community Flash Flood Warning in the Caribbean and the Central America.

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International Workshop on Flash Floods Forecasting 13-17 March 2006, San Jose, Costa Rica

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  1. International Workshop on Flash Floods Forecasting 13-17 March 2006, San Jose, Costa Rica Development of Equipment for Community Flash Flood Warning in the Caribbean and the Central America Hidetomi Oi Japan International Cooperation Agency (JICA) Jacob Opadeyi West Indies University in Trinidad and Tobago

  2. History of development of equipment • After hurricane Mitch in 1998, a person of CEPREDENAC invented a water level gauge: cheap and simple but much more functional than the conventional stuff gauge. Many communities in Central America have now warning system using this equipment. • In 2003 the equipment was presented at a conference in Jamaica. A participant from CDERA thought rain gauge should also be improved applying the same concept.

  3. In 2004 a new type of rain gauge was manufactured in Japan and was donated to a community project in the Philippines. • In 2005, improvement was made with the equipment (increase in the number of sensors from 1 to 3). The improved one was installed in a community in Barbados. • In 2006, a group of engineers of UWI volunteered to make further improvement (automatic dialing to residents). The new one will be used for community projects in CDERA member states to start in 2006. • Mass production is necessary to cover so many communities at risk of floods, while continuing effort for improvement. Problem is lack of fund.

  4. What is new? What are advantages ? What are limitations? Answers will be given by the following examples. Reventado Caparo Speightstown

  5. Community Flood Warning for Reventado in Costa Rica - Example of using the new water level gauge -

  6. Rio reventado Taras, Los Diques Afectado x avalancha 1964 Costa Rica. Effects by avalanches. Area Reventado Watersheds and Los Diques Communities. Cartago. Reventado watershed. A big avalanche in 1964related with volcanic deposits and different materials (ash & piroclast) combined with heavy rains.

  7. Installation of water level gauge Costa Rica

  8. ADVANTAGES • Cheap, easy O/M • Heavy rain is monitored even if it occurs in the midnight. • Presently, the gauge readers have to remain stand-by when alerted by weather forecast of possible heavy rainfall. But with this equipment, they are free until alarmed by buzzer/lamp.

  9. Community Flood Warning for Speightstown in Barbados - Example of using the new rain gauge -

  10. Barbados Meteorological Services (BMS) Flood Warning7:00 am Monday, November 22, 2004 Here is a Flood Warning from BMS. A persistent trough that has been in the area for the last few days produced moderate to heavy showers during the night. These conditions are expected to persist over the island today and with the saturated conditions of the ground any additional rain is likely to produce flooding in some areas. Residents in flood prone areas should be on the alert and take the necessary precautions. This warning will remain in effect until 4 pm today.

  11. Rainfall equipment with the alarm unitfor community operated flood warning Fixed or Mobile Phone

  12. The buzzer sounds and the light turns on, and dials residents at the same time Whenever accumulated rain reaches pre-set levels, then,

  13. Conceptual System Design

  14. Dept. of Surveying and Land Administration The University of the West Indies, Trinidad Jacob Opadeyi, PhD Features of the System • The system is capable of detecting 3 predefined rainfall levels. • The device generates an audible alarm based upon the changing rainwater levels. • The electronic of the system transmit alarm signals to a public or cell telephone using either landline or GSM network. • It is a stand alone system.

  15. Dept. of Surveying and Land Administration The University of the West Indies, Trinidad Jacob Opadeyi, PhD • When it rains, rainwater drips into the cylindrical container through the funnel place outside of the monitoring station. • When the rainwater reaches any of the three pre-determined level, the system will self-dial a call to a phone to the alarm level using 3 different rates of tones. • The system will dial a user-configured number within 6 seconds of any new level being crossed. Features of the System

  16. Dept. of Surveying and Land Administration The University of the West Indies, Trinidad Jacob Opadeyi, PhD • The unit will output a unique level-dependent audible beep pattern approximately 2 minutes after any level has been exceeded. The unit remains silent otherwise. • Calls are repeated every 5 mins • The unit identifies itself using caller-ID. • The phone number is stored in non-volatile system memory. • Currently operates ONLY with 115V AC. Features of the System

  17. Dept. of Surveying and Land Administration The University of the West Indies, Trinidad Jacob Opadeyi, PhD SystemRequirements • The device should be installed on a house or a remote monitoring station. • The station should have a direct phone line to be used for initiating calls • The station should be wired with 110V electric power with outlet for the system • The landline or cell phone capable of receiving calls 24/7 within the territory

  18. Flood Hazard Map of Speightstown, Barbados

  19. ADVANTAGES • Cheap, easy O/M; • Sudden rise in water level can be detected even if it occurs in the midnight; • Gauge readers no more need to go out to the gauging sites under the risky condition of wind storm, in the midnight etc.

  20. Community Flood Warning for Caparo in Trinidad and Tobago - Introduction of the new water level gauge is under consideration-

  21. EX. OF COMMUNITY OPERATED FLOOD WARNING Caparo river, Trinidad 10 year flood 50 year flood 5 year flood 2 year flood

  22. Stuff gauge for community flood warning Problem: Difficult to go to the sites under heavy rainfall and strong wind

  23. Advanced Systems

  24. Recommendation (1) • WMOwill support national/regional institutes to produce/improve equipment for community flood warning and to test/evaluate the appropriateness to different conditions, and will officially announce the result.

  25. Recommendation(2) • WMO, NOAA and other leading agencies will take actions for the more closer cooperation between: - meteorologists, hydrologists and disaster managers - all levels, central level through community level. • Representatives from all levels will be invited to this kind of meetings in the future. • Manuals, guidelines etc. will be prepared to cover not only advanced technologies but also primitive ones so that governments and local groups may chose whatever most appropriate to their respective conditions, natural, social, human, financial etc. • In conclusion, in order to attain the goal (protect lives and properties) community based flood warning should be promoted while continuing effort for the advancement of high-technology and its application.

  26. Thanks For further information please contact: Oi.Hidetomi@jica.go.jp jopadeyi@eng.uwi.tt

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