Measuring water level is one of the most common surface water quantity measurements which is typically used for developing & computing stage discharge relationships or controlling water resources. Continuous real-time measurements can provide flood warning information including alarms for water levels that hit or exceed critical threshold levels to prompt manual or automatic responses such as evacuations during flooding & field operations.
The IoT (Internet of Things) based “Kashmir Flood Alert” Mobile App provides Real-time Monitoring of water levels of River Jehlum and its Tributaries. Devices installed at various guage sites are using Radar Level Sensor technology for Automatic Water Level Recorders (AWLR) which provide periodic (Hourly) data on real-time.
Operation of the radar level sensor is based on pulse radar technology. The transmitting antenna emits short radar pulses. The separate receiver antenna receives the pulses reflected from the water and uses them to determine the distance between sensor & water surface, the time taken by the radar pulses from transmission to reception is proportional to the distance between sensor & water surface. The actual water level of the waterway is then calculated automatically by the radar sensor. Approximately 16 individual measurements are conducted per second & averaged after 20 seconds to minimize wave influences.