Rainfall (Siren Activated) Flood Warning System

Hanoi, Vietnam7th November 2008

BACKGROUND• In 2007, Hydrological Services was approached by Haiduong

Co. Ltd to provide a solution for flood warning

• After careful consideration, the RainTrak, ‘all in one’ rainfall product was offered with some modifications to facilitate a siren and larger solar panel

• Solution 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, Vietnam

• A ‘prototype’ system was sent to Vietnam for evaluation

SYSTEM DESIGN CRITERIA

TB4 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 steel

SYSTEM PROTOTYPE

MODIFICATIONS UNDERTAKEN

• Large Capacity Solar panel: 12V, 20W

• Large deep cycle battery: 12V, 38aH

• iQUEST iRIS220 Data Logger with specialised alarm software and in-built GSM modem

PROVEN TECHNOLOGY

• HS 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 Australia

• All equipment will stand up to high temperatures and humidity

• All equipment supplied with 3 years warranty

iQUEST PRODUCT - Client List

SIREN ACTIVATION THRESHOLDS

Threshold No.Rainfall Rate

(mm per 3 hours)

No. of Siren Activations(5 minute intervals)

1 80 1

2 90 2

3 100 3

ALARM PROTOCOLSRainfall Rate

(mm / 3 hrs)

100

80

90

Time

1 Siren Activation

every 5 minutes

2 Siren Activations

every 5 minutes

3 Siren Activations

every 5 minutes

SMS MESSAGE SENT (UP TO 2 PHONE NUMBERS)

Alarm No. 1

Alarm No. 2 Alarm No. 3

SYSTEM SETTINGSSMS Function:

- sends SMS message to 2 pre-programmed phone numbers

- a different message for each alarm criteria

PC Activated ‘Changes’:

- rainfall thresholds for each alarm (e.g. 80mm / 3 hrs)

- number of siren activations for each alarm

- siren activation timing for each alarm (e.g. ON 1 sec / OFF 1 sec)

- siren activation interval (e.g. 5 minute between activations)

- SMS phone number

- Customised SMS message for each alarm

Other Functions:

- direct connection of PC to change parameters / settings

- dial-in connection of PC to change parameters / settings

POWER SUPPLY DATA

• Average continuous power consumption = 10mA (approximately)

• 12V: 38aH battery will last in excess of 3 months without solar charging

• 20 watt solar panel will fully charge the battery (with 4-5 days of good solar exposure)