Devices, constructional details or methods of hydraulic engineering not otherwise provided for

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• E02B 2201/02 Devices and methods for creating a buffer zone in the water to separate, e.g. salt and sweet water
• E02B 2201/04 using old tires for hydraulic engineering
• E02B 2201/50 Devices for sequentially discharging constant liquid quantities, e.g. into different irrigation channels