DULUTH INTERNATIONAL AIRPORT STORMWATER & LANDSIDE DEVELOPMENT
Krech Ojard and Associates was contacted by RS&H to assist with the stormwater handling and stormwater management associated with the Phase I Landside Development of the Replacement Terminal project at the Duluth International Airport. The proposed project consisted of the reconstruction and relocation of the access loop road and construction of vehicle parking lots. As portions of this project were funded by the American Recovery and Reinvestment Act (ARRA), design needed to be completed quickly to avoid jeopardizing the project’s funding.
Krech Ojard worked with RS&H to quickly develop a phasing plan for the installation of the new storm water system in order to minimize interruptions to the operation of existing terminal parking lot and traffic flow.
Special Issues
The proximity of Miller Creek and area wetlands to the project boundaries was
of concern to the Soil and Water Conservation District (SWCD) and the Minnesota Pollution Control
Agency (MPCA).
Due to the proximity to Miller creek and area wetlands and the lack of stormwater management from the existing parking lot and access roads, The Duluth International Airport Authority, RS&H and Krech Ojard decided to treat more than double the volume of stormwater runoff that was required by current environmental requirements.
- Total Project Area = 45.0 ac
- Existing Impervious Surface Area = 17.6 ac
- Proposed Impervious Surface Area = 20.7 ac
- Additional Impervious Surface Area Created = 3.1 ac
- Required Water Quality Volume To Be Treated = 0.258 ac-ft (11,200 cu. ft.)
- Actual Water Quality Volume To Be Treated = 0.583 ac-ft (25,400 cu. ft.)
- Area 1- 80 MC-3500 Chambers, System Volume-13,500 cu. ft., Water Quality Volume- 10,900 cu. ft.
- Area 2- 100 MC-3500 Chambers, System Volume – 16,700 cu. ft., Water Quality Volume – 14,500 cu. ft.
