A. 路堑排水可在路肩两侧设置侧沟
B. 地面横坡明显的地段，可在上方一侧设置排水沟或天沟
C. 对有集中水流进入天沟的地段，应采取防冲刷措施
D. 当采用渗水隧洞排除地下水时，应每隔30m设置检查井
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