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【单选题】
下列关于水闸说法错误的是
A.
当水闸的闸门有多个时，一般开启的顺序先开中间的闸门，然后向两边开启
B.
砂性土地基中管涌问题比较严重
C.
消力墩的使用可以分散水流形成更多漩涡，增加效能效率，可减小消力池的深度和宽度
D.
防渗长度的起点是水流进入的入土点，终点是水流离开的出土点
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