{"id":10833,"date":"2024-02-20T17:45:19","date_gmt":"2024-02-20T16:45:19","guid":{"rendered":"https:\/\/www.aboutriver.com\/?p=10833"},"modified":"2024-02-20T17:45:19","modified_gmt":"2024-02-20T16:45:19","slug":"does-mississippi-river-have-exterior-drainage","status":"publish","type":"post","link":"https:\/\/www.aboutriver.com\/does-mississippi-river-have-exterior-drainage\/","title":{"rendered":"Does Mississippi River Have Exterior Drainage"},"content":{"rendered":"
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Main Topic: Does Mississippi River have Exterior Drainage?<\/h2>\n

The Mississippi River is home to a variety of spectacular wildlife species. In the American Midwest, it flows from the Rocky Mountains of Minnesota to the coast of Louisiana in Louisiana. As the fourth-longest river in the United States, it is considered a river of national importance. One question often asked by both environmentalists and tourism operators is: Does Mississippi River have exterior drainage? To answer this, let’s look at how the river functions.<\/p>\n

The Mississippi River, as a source of fresh water, is nearly completely self-contained. More than 95% of the water that enters the river stays within the system. As the river flows along its meandering course, the water evaporates, ships transport water away, and some of the river water seeps into the groundwater. Drainage to any other sources is minimal and in this way, the river is largely self-contained.<\/p>\n

The most noticeable external drainage is to the Gulf of Mexico. About 5% of the Mississippi River waters end up in the Gulf of Mexico, having traveled approximately 1800 miles from the river’s headwaters to the shore. This water flow helps to sustain the Gulf’s wetlands and create the salinity balance the Gulf needs. Without this drainage, the wetlands would not be able to sustain its animal and plant life.<\/p>\n

Though there is minimal external drainage of the Mississippi River, water does leave the system through underground drainage. This phenomenon is known as “groundwater outflow” and is a result of the fractured rock that makes up the permeable base of the river valley. In a study done in 1992, the total outflow of groundwater from the Mississippi River was calculated to be around 7%, with an approximate 5:3 ratio of groundwater outflows in Minnesota and Wisconsin compared to those in South Dakota, Iowa, and Louisiana.<\/p>\n