Significant Flooding from Reduced Ditch Capacity
The Village of Elk Grove Village had experienced significant flooding in their Business Park. The 3,900 acre Business Park was drained through a substantial network of open drainage ditches that were providing sub-standard protection from significant storm events. The flooding was believed to be due to decreased ditch capacity throughout the park as a result of sediment buildup and vegetative growth that had occurred since the business park was originally developed. Village officials identified the need to improve drainage capacity and conveyance in order to provide additional flood protection for its Business Park tenants.
Civiltech Provides Extensive Hydrologic and Hydraulic Modeling
Civiltech completed hydrologic and hydraulic modeling to determine problem areas, recommend improvements and help develop detailed design and construction priorities. The major ditch runs in the park were modeled to analyze existing flood conditions and to recommend flood mitigation techniques as well as permanent erosion protection. Civiltech then proposed a series of design alternatives to reduce the flooding events. The required hydraulic modeling was extensive as it needed to occur comprehensively throughout the park with some areas requiring more specific focus due to localized drainage problems.
The end result of the hydraulic modeling was a prioritized listing of specific projects that could be implemented over a 5 year period of time considering funding and permitting requirements. A jurisdictional determination was required through the USACOE to establish permitting requirements moving forward with the design and implementation of individual improvement projects. Many of the projects included capacity improvements that maximize ditch sections through the use of structural elements within the confined space of the existing easements. Land acquisition was not possible in many areas due to the impacts to the businesses. Other projects included cross road culvert replacement, ditch restoration and stabilization, and flood storage enhancements. The proposed improvements included the replacement of large dual cell CMP culverts at roadway and railroad crossings at 15 locations with single cell precast box culverts. One of the most significant improvements was the partial re-routing of a USACOE jurisdictional channel in an enclosed double box culvert for 1,800 feet along Arthur Avenue and IL Route 83.
Close coordination with the Village, DuPage County, Cook County, the US Army Corps of Engineers and the Metropolitan Water Reclamation District (MWRD) was required as the USACOE has jurisdiction over some of the ditch areas due to potential wetlands and the downstream drainage system is under the jurisdiction of MWRD. Civiltech has obtained the USACOE regional permits as well as the MWRD Watershed Management Ordinance permits for all of the proposed storm sewer and culvert improvements.
This Project Incorporates the Following:
- Improvement to drainage capacity and conveyance
- Design of flood mitigation techniques
- Design of permanent erosion protection
- Dual-cell CMP culverts
- Single-cell precast box culverts
- USACOE regional permits
- MWRD Watershed Management Ordinance permits
- North Cook County Soil and Water Conservation District Erosion Control Permits
Scope of Services
- Hydrologic and Hydraulic Studies
- Hydrologic and Hydraulic Modeling
- Preparation of Contract Plans, Specifications, and Estimates
- Environmental Permitting
- Interagency Coordination