|WORLD METEOROLOGICAL ORGANIZATION||
|Explanation of the criteria for classification and numbering of components||
|Explanation of the dates on the component's description|
ALERT RAIN GAUGE
1. Purpose and objectives
To collect and
report automatically precipitation data using radio signals.
reporting package is modularly designed, including tipping bucket
mechanism, radio telemetry unit and power supply. Each tip of
the bucket, usually measuring 1 mm of precipitation, causes
transmission of a signal which identifies the station and gives
the accumulated value. This
May also include any other environmental sensors, such as temperature,
wind, relative humidity, or river stage.
analogue signal transmitted on a specific radio frequency with
four-digit station identifier and four-digit accumulated rainfall
value. The signals are received by component F00.3.05 "ALERT
Data Collection Substation".
5. Operational requirements and restrictions
Two people should be trained in installation and maintenance procedures. Approximately one week of training is needed.
Installation requires two people. Equipment is needed to dig the hole for the concrete base in addition to the ingredients for mixing concrete.
It is desirable to have some electronic testing equipment at the field site such as remote station tester, wattmeter and voltage meter.
Installation requires approximately four hours. Concrete base should be located below the depth at which the soil freezes in a keyhole shape to prevent the base from being loosened by freezing and thawing.
Battery-pack power supply should be recharged or replaced annually or after 20,000 transmissions, whichever comes first. Batteries may be supplemented by the use of solar panels, or by A/C power if available.
in gauge siting is needed to ensure clear radio transmission
pathways. Signal strength tests should be performed prior
to installation under various seasonal and meteorological
conditions. A relay tower with repeater may be
6. Form of presentation
description of the rain gauge and transmitter.
7. Operational experience
Has been used
successfully worldwide, with the most extensive use in the U.S.A. Use
has been particularly advantageous for basins where time to flood peak
is less than 24 hours.
8. Originator and technical support
technology was originally developed in co-operation with
the Sacramento (USA) River Forecast Center, U.S. National Weather
Service. A list of vendors providing technical support can be obtained
from links on the home page of the ALERT Users Group. The address of
this home page is
10. Conditions on use
Descriptive material free. The gauge is for sale through
commercial vendors, as a package including all elements for
operation of the self-contained station.
|(First entered: 26 JUL 83||
Last updated: JUL 99)