U.S. ARMY CORPS OF ENGINEERS
CHICAGO DISTRICT
ILLINOIS URBAN MANUAL PRACTICE STANDARDS:
Dry Detention Basin Code 809
Extended Detention Basin Code 810
Wet Bottom Detention Basin Code 811
Wetland Detention Basin Code 812

COMMENT PERIOD BEGINS: March 17, 2026
COMMENT PERIOD EXPIRES: April 17, 2026

The above-referenced IUM practice standards are currently utilized for sediment control on construction/development sites. Each referenced standard and associated drawing (attached) is being updated by the IUM Technical Review Committee (TRC). The TRC is comprised of representatives of various regulatory agencies, consultants, developers, and other stakeholders. The Illinois Urban Manual is the primary technical manual for Erosion and Sediment Control in the State of Illinois. The practice standards must be updated due to advances in product development and associated operation and maintenance practices.

The Corps of Engineers and the IUM Technical Review Committee are requesting comments from erosion and sediment control professionals, developers, engineers, contractors, and other interested parties on the enclosed standards. The comments are reviewed by the Technical Review Committee prior to the finalization of an IUM update. The approved standard will be incorporated into the Illinois Urban Manual immediately upon approval by the IUM Steering Committee, and the Illinois Environmental Protection Agency.

For more info and to comment, visit : https://illinoisurbanmanual.org/wp-content/uploads/2026/03/IUM-Updates.pdf