Local warning system – flood warning and forecasting system

The LWS (Local Warning System) serves to warn the population against floods, first of all against storm rainfall (e.g. in storms). It consists of several separate measuring stations and a central station.

According to the measured quantity, they are as follows:
• A precipitation measuring station
• A water measuring station

The water measuring station measures a water level in a stream in front of a town. A measurement interval is 5 minutes, i.e. a level height in a stream is measured once in 5 minutes and the measured value is compared with four different limits. When any limit is exceeded, the station sends a warning message. A precipitation measuring station measures a rainfall volume. Every 5 minutes, the station evaluates whether the limit was not exceeded. The station evaluates four limits ; summary precipitation for the last 5 minutes, 30 minutes, 60 minutes, 12 hours. If the limit is exceeded, the station sends a warning message.

The central station is usually located at a municipal office. The central station is a computer with WinCentral and SQLView (Visualis) running on it.

The WinCentral communicates with stations, downloads data and limit exceeded warnings from them, checks functionality of the stations; the SQLView presents the measured data. The stations communicate with the central station via GSM, dialled lines or via a radios.

Percipitation measuring station

Percipitation measuring station

The water measuring station

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