历史上，北京人工河道、自然河道纵横交错，提供了较强的雨水含蓄及疏导能力。
In the history, Beijing artificial river, natural river channel, provides considerable rain implicative and bear ability.
最后是行洪区得两个口门一般是通过爆破或人工扒口打开，其开启顺序对干流河道水位、流量情况也有一定影响。
Finally, opening the flood diversion work's gate is through blasting or manpower, and the open order influences the discharge and elevation of water in main river.
结果显示，尽管人工水域考虑了与天然河道的连通，但水质仍出现较明显的恶化。
The results show that although the artificial wafer area has been connected with the natural river, the water quality presents obvious deterioration.
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