The methods of measuring unevenness of gravels,laying multiple-orifices filter blocks and stainless nets during the filter reconstruction were used in four water purification plants in Yokohama to assure the normal and effective operation of the filters.

 
  • 橫濱市水道局下屬的4座水廠採取測量礫石起伏程度、濾池翻修時鋪設多孔雙層濾磚和不鏽鋼絲網等措施來保證濾池的正常有效運行;
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