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Οι μαθητές της CAE class ετοίμασαν και παρουσίασαν ένα μάθημα με περιεχόμενο δικής τους επιλογής! Ο μαθητής Φάνης Μπαρδαμάσκος παρουσίασε την παρακάτω εργασία:

Ellis Sylvester Chesbrough (1813–1886) was an engineer credited with the design of the Chicago sewer system, which are sometimes known as the 'Chesbrough sewers'. This was the first comprehensive sewer system in the United States. He is responsible for the plan to raise Chicago, construction of the first water crib in Chicago, and designing the Boston water distribution system. The water system he designed for Chicago is on the National Register of Historic Places and has been designated a Historical Civil Engineering Landmark by the American Society of Civil Engineers.

In the late 1840s, Chicago was growing rapidly and was plagued with health issues: the majority of the city sat at water level, which meant water was unable to drain out of the city. That meant, practically, that the water was not being renewed by the sewer system so it was very polluted, something that was obvious as the water was greenish. The whole city was actually soaked into dirt and sewer ‘s contents giving Chicago the title of the most polluted city in that era.

In response, the public held meetings and demanded that the City Council rid the city of filth. The legislature of Illinois created the Board of Sewerage Commissioners on February 14, 1855, leading to the appointment of Assistant health officers to aid the cleanup, and by August the Council resolved to build a sewage system.

Chesbrough was appointed engineer of the Board of Sewerage Commissioners because of his work on Boston’s water distribution system. From an engineering standpoint, the main problems were moving waste water out of the city and keeping it from polluting the city's drinking water supply, drawn from Lake Michigan His plan was twofold: first, to build the sewer system above ground, and then raise all of the city buildings as much as ten feet using an elaborate system of jacks in order for the new pipes to have the appropriate slope so the water can circulate inside. The new sewer system featured innovations such as manhole covers, which eased access to and cleaning of the sewers. However, sewage still flowed into the lake and polluted the city's drinking water. In 1864, work began on a two-mile Chicago lake tunnel, sixty feet under the lake, out to a new intake crib. This allowed drinking water to be drawn from farther out in the lake, past the contaminating sewage. Eventually, however, sewage water seeped all the way to the crib, giving Chesbrough a third chance. Plans were made to reverse the flow of the Chicago River, leading water away from Lake Michigan and carrying Chicago's sewage into the Mississippi River. In the late 1860s, the Illinois and Michigan Canal was dredged and deepened to expand its ability to handle the city's sewage and move it away from the lake, but continued population growth quickly outstripped the canal's waste management capacity. The project of reversing the river was completed after Chesbrough's death by the Sanitary District of Chicago. In 1968 Chicago ‘s engineers lifted a hole block (3,5 thousand tones) using 6,000 jacks.

This very innovative plan was an actual revolution for the so called known world. Suddenly luxurious cities copied this idea and, London made the first subway in 1990. Before that cities were full of collums and electricity cables. Now most of them are buried into the ground along with gas pipelines and other cables. You may think it’s obvious, but this if this man didn’t exist we may be covered into dirt with no drinkable water.

 

 

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