Providing clean water to residents is a mandate every city and town must fulfill. This is why localities invest millions of dollars in their sewage and water treatment facilities, which require properly collected and treated water to ensure the public's health and safety. Of course, not all water comes from a tap, hose or shower. Often, water comes from precipitation such as rain, a frequent occurrence in New Orleans.
However, unlike municipal water that comes from a tap, rainwater does not go unfettered down a drain. Before it reaches its destination, it saturates the pavement, leaching pollutants on the way. Furthermore, excessive rainwater may overwhelm the existing sewage system, causing it to spill over into nearby water bodies.
http://www.ilsiengineering.com/info-articles/proper-stormwater-management-proves-vital-abating-water-pollution/
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