When the Banks have been crested, the surrounding land becomes the river, with he water moving across flat land in a sheet, toward whatever is the drainage point.
当河岸的顶部被洪水淹没之时，周围的土地就变成了河流，河水成片地朝着平坦的地势流动，无论何处都成了排水点。
The paper point out safety problem which city drainage management make use of network in detail.
文章详细地指出了在城市雨污水排放管理工作网络化过程中存在的安全问题。
From the point of all drainage basin flood control, to reach the optimization schedule, it requires maximum of the total pre-kept ability.
从整个流域防洪角度，要求流域内水库群的总余留防洪能力最大，以满足调度最优化的要求。
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