Publisher's Synopsis
Excerpt from Views of Chicago Drainage Canal as Seen Along the Santa Fe Route
The Drainage Canal is divided into twenty-nine sections, each section averaging one mile in length. Nos. 1 to 15 run south-westerly from Willow Springs, while sections A to O, omitting J, extend east to Robey street. The lettered sections are in earth; sections 1 to 6 are in earth and rock (glacial drift), while sections 7 to 15 are all rock.
The bottom of sections A to E, with 500 feet of section F, is 202 feet wide. East of these thewidth is 110 feet. Sections 1 to 15, except a portion at south end of the latter, are 160 feet wide at the bottom. The width at top of the earth sections is 306 feet.
The fall in earth and glacial drift (from Robey street to Willow Springs) is about one and one half inches to a mile; in solid rock (willow Springs to Lockport) the fall is about three inches to a mile. The bottom of the channel at the controlling works will be about 594/ feet lower than at Robey street.
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