Sudden rainstorm, once again sparked concern on the issue of urban drainage systems. The Beijing urban drainage system design criteria 1-3 years only drain the rainfall of 1/5. Urban drainage system failed to play a role, has led to Beijing 25 people drowned. Such a tragedy occurs, so that people questioned Heart: urban construction do not attach importance to the underground drainage system and other facilities, to face the accused, not lining. ...

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