马蹄形状选择工具和使用聚伞有你的墙整个长度的照片看，如果需要的。
Select the horseshoe shape using the poly tool and bevel it the entire length of your wall looking at the photo if needed.
马蹄形过水断面是无压输水隧洞中常采用的断面形式之一，因其几何形状复杂，水力计算困难。
It is difficult to calculate normal water depth of horseshoe cross section, because its complex geometrical shape.
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