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为了正确的取得水文地质资料，钻孔内下入大直径滤水管（6时～14时）以便顺利地进行抽水工作，往往不得不使用KAM-500型钻机来打大直径钻孔。
In order to obtain the correct hydrogeological data, large-diameter drainage pipes (6 o’clock to 14 o’clock) are drilled into the borehole for smooth pumping work. KAM-500 drilling rigs are often used to drill large diameter boreholes.