DISCHARGE RATING VERIFICATION

Rainfall (Siren Activated) Flood Warning System Hanoi, Vietnam7th November 2008

1BACKGROUNDIn 2007, Hydrological Services was approached by Haiduong Co. Ltd to provide a solution for flood warningAfter careful consideration, the RainTrak, all in one rainfall product was offered with some modifications to facilitate a siren and larger solar panelSolution required for early warning for evacuating villages in northern Vietnam

Product design was a combined effort between Hydrological Services Australia and Haiduong Co. Ltd, Hanoi, VietnamA prototype system was sent to Vietnam for evaluationSYSTEM DESIGN CRITERIATB4 Tipping Bucket Rain Gauge: - accuracy +/-2% 25 to 300mm/hr; +/- 3% 300-500mm/hr - maximum range 500mm/hr - stainless steel bucket pivots - metal enclosure/catch with syphoniRIS220 Data Logger: - on board GSM modem - alarm and control functions - digital inputs - digital control outputs (siren) - internal power supply - option for external power - direct connection to solar - RS232 interface - compact designEnclosure: - IP65 rating - powder-coated steelSYSTEM PROTOTYPE

MODIFICATIONS UNDERTAKENLarge Capacity Solar panel: 12V, 20WLarge deep cycle battery: 12V, 38aHiQUEST iRIS220 Data Logger with specialised alarm software and in-built GSM modemPROVEN TECHNOLOGYHS TB4 Gauge widely used around the world (822 units sold to Thailand Meteorological Service in 2008)iRIS range of loggers sold to many Water Authorities within New Zealand and AustraliaAll equipment will stand up to high temperatures and humidityAll equipment supplied with 3 years warrantyiQUEST PRODUCT - Client List

SIREN ACTIVATION THRESHOLDSThreshold No.Rainfall Rate(mm per 3 hours)No. of Siren Activations(5 minute intervals)1801290231003ALARM PROTOCOLSRainfall Rate (mm / 3 hrs)1008090Time1 Siren Activation every 5 minutes2 Siren Activations every 5 minutes3 Siren Activations every 5 minutesSMS MESSAGE SENT (UP TO 2 PHONE NUMBERS)Alarm No. 1Alarm No. 2Alarm No. 3SYSTEM SETTINGSSMS Function: - sends SMS message to 2 pre-programmed phone numbers - a different message for each alarm criteriaPC Activated Changes: - rainfall thresholds for each alarm (e.g. 80mm / 3 hrs)- number of siren activations for each alarmsiren activation timing for each alarm (e.g. ON 1 sec / OFF 1 sec) siren activation interval (e.g. 5 minute between activations)SMS phone numberCustomised SMS message for each alarmOther Functions: - direct connection of PC to change parameters / settings - dial-in connection of PC to change parameters / settingsPOWER SUPPLY DATAAverage continuous power consumption = 10mA (approximately)12V: 38aH battery will last in excess of 3 months without solar charging20 watt solar panel will fully charge the battery (with 4-5 days of good solar exposure)