Page 21

Xylem Greater Asia in Action - Digital Publication

021 YSI flod monitoring Monitoring for floods requires monitoring of water level, current, and precipitation to record and trigger an alert based on these parameters. The YSI family of companies manufacture and can help in choosing the right sensor all of the way down to installing and maintaining the systems. Components of a flod monitoring system • Water level: depending on the accuracy and installation location there are 4 methods for measuring water level in a flood alert system. These include submersible pressure sensor, bubbler system, shaft encoder, and the latest technology a non-contact radar level system • Precipitation: in most flood alert systems rain precipitation is an early warning trigger to flood events. To measure rainfall a tipping bucket rain gauge is most typically used. The tipping bucket rain gauge features and SDI-12 output to make integration and troubleshooting the system rather simple • Discharge: for many applications measuring water level may be sufficient for determining discharge calculated off of water level. This process requires several service visits to develop a rating curve correlating water level to total water discharge. For systems that are not gravity fed or may have variable backwater water level alone won’t work for calculating the volume of water in a stream. For these applications an acoustic Doppler instrument can be installed to provide accurate velocity information to calculate discharge • Data Transmission: three primary options include data to the web, ALERTS network share transmissions, and point to point data to the desktop


Xylem Greater Asia in Action - Digital Publication
To see the actual publication please follow the link above