HOMS COMPONENT

DEBRIS FLOW ALARM SYSTEM

1.   Purpose and objectives

     This system predicts the occurrence of debris flow and other sediment disasters caused by heavy rain, and informs operators in charge of this information according to the rainfall data.

2.   Description

     This system consists basically of multiple raingauges and a  supervisory station.

     Repeater stations may be required according to the radio propagation conditions between each gauging station and the supervisory station. The system provides the following functions:

     (a) Automatic rainfall data collection function;

     (b) Debris flow occurrence prediction (warning and evacuation decision) function;

     (c) Information transfer function to operators in charge of the system  using the telephone           answering equipment.

     Supervisory station handles up to 16 rain gauges with expansion to 32 gauges as an option.

     This system has the additional functions of collection and processing of trip wire disconnection information for detection of debris flow occurrence.

3.   Input

        Rainfall data for every 1 mm by a self-reporting system (automatic start-up system).

4.   Output

     (1) Data Printing.
         Rainfall data and warning decision levels or evacuation levels.

     (2) Warning Output.
          Audible and visible warning output, automatic telephone information and display to warning           display panel.

     (3) Data storage.
         Storing rainfall data in units of minimum 10-minute intervals. Data is recorded as required on a           diskette by an option rainfall data analysing system.

5.   Operational requirements and restrictions

     This system is operating automatically. However, for the disaster  forecasting and warning, an operation /maintenance team is recommended, consisting, for example, of one (1) supervisor, one (1) engineer and two (2) technicians. A period of one month is required to survey and install the component. The training necessary for successful implementation and use of the component is as follows:

        Factory training     :  one (1) week
        On the job training  :  two (2) weeks

        The computer system consists of:

        Hardware  processor  :  i486SX/33MHz
        system memory        :  4 MB
        hard disk            :  200 MB
        CRT display          :  14 inches
        printer              :  impact dot matrix
        Operating system     :  MS DOS /MS Windows

     Characteristics of power supply, special environment and other related requirements:

        Power supply         :  solar cells (12V DC) or alternating current 
                                       (100V/220V AC) backup by storage battery
        Temperature          :  - 5 to 40 C (supervisory equipment) 
                                       -10 to 40 C (gauging equipment)
        Humidity               :  90% or less (supervisory equipment)
                                       95% or less (gauging equipment)

     Measuring unit of rain gauge: 1 mm/tilt

6.   Form of presentation

     Catalogues are available.

7.   Operational experience

     Several hundred gauging stations and one hundred or more supervisory  stations have been installed worldwide.

8.   Originator and technical support

     Japan Radio Co., Ltd.

9.   Availability

     From the HOMS National Reference Centre for Japan.

10.  Conditions on use

     Instrument for sale.

Last updated: 21 APR 00)
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