Take soil pit of slope, inside should be for 1:1.5, outside side should be is less than 1:1, river lots of pit end of longitudinal slope can reduced to 0.1%, along take soil pit of pit end of longitudinal slope should not be is less than 0.2%, pit end of General should be high out near waters of perennial level, take soil pit of pit end of cross slope can made to route outside side tilt of one-way slope, slope thick for 2%~3%, dang take soil pit pit end of width is greater than 6m Shi, can made to middle tilt of two-way cross slope, And set the bottom in the Middle 0.4m wide longitudinal drains, when bottom longitudinal slope is greater than 0.5%, no drains.(4) when the soil along the River, and shall not be blocked rivers, crush the hole and caused bank erosion.
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