포장면적 확대가 불러온 대홍수 참사 사례, 허리케인 하비(Harvey)와 휴스턴

전략...

Houston’s population climbed to 2.2 million in 2015, a 25 percent increase from 1995. 

Harris County had an even bigger bump over that time, 42 percent, and now has 4.4 million residents. 

As the population grew, the city expanded, covering fallow land that had served as a natural sponge.

Between  1992  and  2010, 30 percent of the surrounding county’s coastal prairie wetlands were paved over,
according to a 2010 report from Texas A&M.

Projects to widen the bayous and build thousands of retention ponds for excess water have not kept pace with the new rooftops, roadways and parking lots needed  to  accommodate  about 150,000 new residents a year, experts  say.  

As  a  backup, roads were built below grade and designed to take on excess water when storm drains overflow.

...후략

Sources: Houston TranStar, Harris County Flood Warning System, Texas Health and Human Services Commission, U.S. Census Bureau

출처 : The Washington Post - 2017.08.30

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