A new approach to tunnelling dewatering with Grindex Pumps When the mountain topography of the Yellow River Tunnel Project in Xiao Yi, China, was originally surveyed, the projected water seepage rate was 50 l/s (13g/s). But by the time the build had reached 1km of the 20km long tunnel, the water seepage rate was at 216 l/s (57g/s). Fortunately, The CMC Construction Company’s new approach to tunnel dewatering – backed up by Grindex submersible pumps – meant the water could be evacuated and construction could go ahead without costly delays. Harnessing the waters of a great river Over the past 25 years China has invested heavily in vast construction projects to transport water from the Yellow river to regions with a shortage of water. One of the latest projects to harness the waters of this g

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