(1) the drainage design should be based on the grade of the road along the topography, geology, and the position of comprehensive consideration, rational layout and drainage capacity is enough, to improve the handling of water outlet, so that the coordination to ensure the smooth drainage facilities.(2) should be coordinated with the planning and construction of water conservancy, prevent damage or destroyed farmland irrigation and water conservancy facilities. When the roadbed occupied irrigation ditch, should be restored, and take the necessary measures of seepage.(3) the road through the villages and towns residents, drainage facilities should be coordinated with the existing water supply, drainage facilities and construction planning.(4) drainage should be adapted to local conditions, the economic application of drainage ditches should choose the terrain, better geological lot through, in order to save the strengthening of investment projects. The water outlet drainage ditches should be introduced to the natural rivers, in order to reduce the bridge project.
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