Taking some roads and bridges under construction along small rivers in some mountainous region of Guizhou as the engineering back-ground, the paper has the hydraulogical calculation and analysis of its bridge culvert, calculates the design flow and water level, and provides some reference for the hydraulic controlling elevation of bridges.%以贵州省某山区在建的小流域公路桥梁为工程背景，对其进行了桥涵水文计算分析，计算出设计流量与设计水位，进而为桥梁的水文控制标高提供依据。
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