- Hydraulic Analysis using XP-SWMM
- Secured Funding from NDSWC
- Grade Raise and Pavement Design
- Control Gate and Structure Design
- Outfall Piping and Outlet Structure Design
- Erosion Control
- Pump Station Planning and Design
- Construction Observation
Burleigh County identified the Tavis Road causeway as the
location for permanent flood protection after the 2009 and 2011
flood events. In 2012, Burleigh County entered in an agreement with
Apex Engineering Group to provide the engineering services to
accomplish this goal.
Apex used the City of Bismarck's existing XP-SWMM model to
determine the 60-cfs pumping rate requirement for the contributing
watershed. Many scenarios were created in the model to analyze
various events, and inundation mapping was created for the upstream
Riverwood Golf Course and adjacent homes.
From the modeling process, it was determined the best solution
was to modify the existing box culvert through the causeway to
include a 16-foot wide flood control gate. The roadway was raised
to the required freeboard, and three, 24-inch gasketed reinforced
concrete discharge pipes with an outlet headwall and erosion
control mats were installed to protect the embankment. A 60-cfs
pump station was constructed as a utilitarian cast-in-place
concrete structure using submersible propeller pumps. The pump
station is designed to remove internal stormwater from South
Bismarck and Burleigh County by pumping the stormwater from the
protected side to the river side of Tavis Road.
The modifications to the Tavis Road causeway provides a flood
control structure and the location to pump internal runoff from
South Bismarck and Burleigh County during a Missouri River ice jam
or open water flood event.