Case study: Keeping floods at bay in Tianjin

Case study: Keeping floods at bay in Tianjin

The first and largest 800 MHz TETRA network in mainland China plays a key role in flood management.


Tianjin ranks on a top 10 list no municipality wishes to make: It's among the top 10 cities in the world at risk of flood loss.

Specifically, Tianjin risks losing nearly 100,000 residents and $30 billion in assets in a deluge, according to a report by Risk Management Solutions.

As Tianjin leaders work to safeguard the sixth largest city in the People's Republic of China from potentially devastating floods, they employ a surprising tool. In addition to channels, reservoirs and hydraulic monitoring, city officials rely on an 800 MHz TETRA network, developed by CASSIDIAN.

The network - the first and largest 800 MHz TETRA network in mainland China - transmits the hydrological information officials use to prevent floods. It also keeps leaders connected during the critical flooding season.

TETRA network for secure voice communication

Tianjin's 800 MHz TETRA network comprises:

  • One switch
  • 15 base stations covering both the city and its suburbs
  • One dispatcher workstation
  • 100 800 MHz radio terminals, set up in duty vehicles, key Tianjin bureau offices and the Command and Control centre

Every year before the flood period starts, officials distribute 800 MHz radios to 31 departments, such as the key county flood prevention offices, gate stations and reservoirs.

Duty staff members use their radios' group calls function to stay in close contact with each other during this critical time.

TETRA network for data transmission

In addition to keeping Tianjin officials connected during the critical flooding season, the TETRA network is also a key component the city's flood forecasting system itself.

Here's how it works:

Hydrological and hydraulic monitors at 19 stations measure rainfall, water levels and other data. That data gets transmitted from TETRA 800 MHz radios to the base station and on to a central station via microlink. At the same time, the information goes directly to a central database via SDSs.

That system gives Tianjin officials the data they need to control flooding most of the time - and to warn residents when flooding is unavoidable.

TETRA network helps mitigate risk

Located at the confluence of the Hai, Yellow and Yangtze rivers, Tianjin isn't going to wipe its name off the top 10 flood risk lists any time soon.

But - thanks to the TETRA network and 800 MHz radios - Tianjin officials are doing a stellar job of closing the floodgates.

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