The APWA Illinois Chapter awarded the City of Champaign a 2015 Project Award (Environment – Less than $5 Million) for the West Washington Street Drainage Improvement project.
Clark Dietz provided the City professional engineering services for drainage improvements to the West Washington Street drainage basin. The Washington Street Watershed had a long history of flooding problems, which affected hundreds of residents along the watershed. The flooding was primarily attributed to an undersized storm sewer system not built to today’s design standards. Extensive public outreach and stakeholder input went into the development of the key project parameters and concept plans.
Phase I of the drainage improvements was the first phase of a comprehensive three part flood control project to improve the flood protection level in the watershed from a 1-year level to a 40-year level. The primary feature of Phase I is an 11-acre-feet detention basin, which holds approximately 28% of the 40 acre-feet of storage volume that is needed in the watershed to achieve a 40-year flood protection level. While the primary goal of Phase I was to improve flood protection levels, a secondary goal was to turn the space into a park-like area that could be utilized by the community for recreational purposes. Park like amenities include a multi-purpose path, gazebo, benches, ornamental fencing and lighting, outcrop boulders, landscaping and rain gardens.
Phase I was completed in November 2014 and the remaining two phases are in the conceptual stages.