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In a foreign country, in order to prevent urban flooded, urban drainage standards are generally higher than the domestic ones, New York " " 10 to 15 in Tokyo, the standard is the "5 to 10, one in Paris" is a "5 years" standard.

In overseas, for guards against the city waterlogging, city draining water standard generally compared to domestic high, “as soon as New York is “ten to as soon as 15 years meets” the standard, Tokyo is five to ten years meets”, “as soon as Paris is five years meets” the standard.

In a foreign country, to prevent waterlogging of cities, urban drainage standards generally higher than for domestic, New York is the "10-15 year" criteria, Tokyo was "5-10 year" Paris is the "five year" standard.

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