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Seattle's Stormwater Managment System

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Prior to 1890, Seattle relied on an assortment of sewers and cesspools that, at best, drained into surrounding lakes and salt water. Faced with recurring threats of waterborne diseases including typhoid and cholera, Seattle's first centralized combined sewage system was planned in 1891. This plan sought to remove as much city sewage as possible into the salt water of Elliott Bay and the Puget Sound with more limited drainage into the fresh water of Lake Washington. In Seattle, there are three types of sewer systems: Combined Sewer, Partially Seperated Storn Sewer, and Seperated Strorm Sewer. In these three, the best way of sewer and stormwater managment is the last one to separate storm and sewer. This is because, if the dirty water and stormwater
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