Chicago : Engineering and Contracting Pub. Co. · leaf 616
tem presented four supply system, permission to cross under it atany point except through the arch culvert wasrefused. This fixed the alinement at thispoint and also the elevation of the sewer, asthe crown of the sewer arch could not beraised appreciably above that of the old cul-vert. The general… … age condition requires, so that west of thispoint a steep grade, 0.6 per cent, was used tobring the sewer up to the normal level. Eastof the conduit a flat grade, 0.2 per cent, wasused for the same purpose, this being especially important at the lower end where thesoil was known to be very wet. As…
Buildings
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
