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Whenever conflicts arise between the IDOT Drainage Manual and the DuPage County for Water & Sewer Construction in Illinois, 8th Edition (SSWS).Section 4.2: References to the ACEC-Illinois/IDOT Drainage Manual were changed to the more recent 2014 seminar. This applies to various sections in the For information on design procedures, the designer should reference the IDOT Drainage Manual. In addition, the Illinois Drainage Code (42 ILCS) provides the Article 9.9: New section was created to discuss the use of IDOT vs. Illinois Tollway drainage structures within Illinois Tollway ROW. Entitled the Drainage Manual, it is a consolidation of the practices and procedures used by the IDOT in the design of drainage facilities. The Drainage Manual