City of Crest Hill Citywide Drainage Analysis
The City of Crest Hill experiences chronic drainage and localized flooding problems. Inundation of backyards, basements, garages and streets occurs regularly during significant rainfall events, diminishing the quality of life for dozens of affected residents.
In response to several damaging storms that occurred in 2008 and 2009, the City Council authorized comprehensive investigations of the City’s storm sewer infrastructure. Public outreach efforts and various meetings identified 21 Problem Areas that were analyzed. Causes of flooding included absence of storm sewers, inadequately sized sewers, lack of detention and insufficient overland flow routes, culverts and storm inlets blocked with debris, excessive infiltration and inflow causing basement backups, and power outages causing sump pump failures.
Recommendations for improvements were outlined in a report and depicted on exhibits for each Problem Area. The report also identified needed easements, permits, and other agency coordination, as well as provided preliminary estimates for construction and engineering. The total estimated cost to implement solutions is approximately $9,000,000.
Recommendations were also provided for targeted stormwater operation and maintenance, as well as updates to stormwater and floodplain ordinances.
KEY PROJECT ELEMENTS
Inventory of Problem Areas using questionnaires and meetings
GPS locates of storm infrastructure, complete storm sewer atlas
Research and summarize stormwater quality and environmental regulations and local efforts
Investigate flooding causes for 21 defined Problem Areas
Topographic survey of strategic locations, preliminary hydrologic and hydraulic modeling, preliminary design of improvements, cost estimates
Formal report and summary of findings including 39 Maps and Exhibits, and two presentations to City Council
The City of Crest Hill has an understanding of the extent of flooding and the infrastructure needed to remedy various locations. This report will be used for planning and budgeting of future capital improvements.
Since completion of the report in August 2010, with the assistance of Robinson Engineering, the City has successfully secured funding from the DCEO for improvements in one Problem Area and has applied for funding of improvements in three other Problem Areas. Coordination has also commenced with the City of Joliet and the Will County Forest Preserve for further planning in one other Problem Area.