Water Projects


Tavis Road Flood Control

Burleigh County, ND

Flood Control
Services Provided
  • 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
Overview

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. 

Approach

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.   

Outcome

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.