|WORLD METEOROLOGICAL ORGANIZATION||
|Explanation of the criteria for classification and numbering of components||
|Explanation of the dates on the component's description|
ALERT RIVER LEVEL (FLOAT-TYPE) STATION
1. Purpose and objectives
fluid levels including levels of streams and lakes or in irrigation
and sewage systems.
The sensor is
usually housed in a stilling well. The unit consists of float,
counterweight, beaded chain, and shaft encoder. As the
float rises or falls with water level, the incremental change in
identification and water level value for reception by component
F00.3.05 "ALERT data collection substation".
5. Operational requirements and restrictions
should be trained in the installation and maintenance of the
sensor when it is used in conjunction with components
C30.3.01 and F00.3.05; one or two days of training is necessary.
The stilling well should be of a sufficient diameter to minimize
internal wave action, and the float sensitivity properly selected
to prevent a drain on the transmitter battery due to sending
6. Form of presentation
description of the sensor.
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
was originally developed in cooperation with the
Sacramento(USA)River Forecast Center, U.S. National Weather Service.
From the HOMS
National Reference Centre for U.S.A.
10. Conditions on use
material available free. The sensor, which is for sale by
commercial vendors, may be sold separately or in a package with
the standpipe-transmitter station.
|(First entered: 28 JUL 83||
Last updated: JUL 99)