Weather radar and rainfall forecasting

In many areas climate change will affect the prevailing pattern of precipitation. Extreme rain events will become more frequent and the precipitation will intensify. This will increase the pressure on water collection systems and wastewater treatment plants.

Warning and forecasting systems provide the tools necessary for authorities and operators to plan ahead and make the right decisions. Accurate predictions can be made if sufficient data is available. Traditional rain gauges provide data with low temporal and spatial resolution. Weather radars in contrast provide high resolution data. A radar effectively offers many synthetic rain gauges in one installation. The radar is therefore a highly efficient way of obtaining the data required for accurate predictions. 

Dedicated weather radars are expensive. By modifying standard marine radars and implementing the interpretation algorithms the same data can be obtained at a much lower cost. Such systems are already installed in many cities worldwide. They detect the first raindrop falling and track the precipitation as it falls. This provides data with high spatial resolution and is therefore much more accurate.

By combining the radar data with metrological forecasting models the inflow to the water collection systems can be predicted. This provides crucial information on part of the hydrological cycle.
The weather radar enables the operators of wastewater treatment plant to plan ahead and determine which measures to implement.

DHI radar systems include all the hardware and software necessary to optimise operations through intelligent control and risk assessment.

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Lisbeth Pedersen

Niels Einar Jensen