GHA evaluated numerous potential improvements to lower local flood elevations in the Swansway Subdivision in Deer Park without negatively impacting other areas. The final design included excavation of a low quality wetland complex to lower the normal water level,  increasing available flood storage volume.

GHA provided conceptual planning, a feasibility report, stormwater modeling services, agency coordination including permits from the LCSMC, the US Army Corps of Engineers, and the IEPA, preliminary and final engineering plans, preparation of construction documents, construction layout and observation and contract administration.

GHA coordinated services to prepare a restoration plan to enhance the excavated and undisturbed areas with native wetland plantings to create an aesthetically pleasing and environmentally sound improvement to the area.  

There were some challenges to overcome on this site. For example, hydric soils at the project site were difficult to manage during construction.  The sequencing of construction operations was crucial to the success of the excavation work and was highly dependant on weather conditions.  Area residents required the work to take place during the winter school season to minimize hazards to neighborhood children.  GHA field technicians worked closely to facilitate access and sequencing and keep the residents informed regarding progress. Sedimentation and erosion control measures were monitored continuously to protect the downstream waterways from sediment runoff.