Comprehensive Flood Mitigation

Culvert and Creek Channel Improvements

Johnson County, Kansas

Project Overview

Alleviating Flooding on Nieman Road

GBA completed a Preliminary Engineering Study (PES) to investigate the flooding of Nieman Road and businesses along Tributary 63 of Turkey Creek. After completing the PES, GBA worked with Johnson County Stormwater Management Program (SMP) to secure funding for culvert and creek channel improvements. GBA’s mission was to:

  • Eliminate 100-year storm flooding of adjacent businesses
  • Increase culvert capacity at Nieman Road
  • Reduce the 100-year storm flood depth to less than 7 inches at Nieman Rd

GBA worked through several alternatives and hydraulic evaluations with the city before finalizing a plan to remove the adjacent businesses from the 100-year floodplain. Central to the design was the phased replacement of the existing two-cell reinforced concrete box (RCB) with a larger 3-cell RCB. In addition, retaining walls were used along the creek to provide bank protection to tightly spaced adjacent businesses and to improve hydraulic capacity. GBA completed the floodplain development permit and obtained a Corps of Engineers Nationwide Permit.

The innovative retaining wall solutions allowed for the walls near businesses and parking lots to be constructed without interrupting their daily business traffic. In total, 15,000 square feet of retaining wall was constructed with heights up to 22 feet and 1,600 linear feet of drilled shaft foundation.

Coordination with utilities, property owners and other consultants working on the “Nieman Now” project was all crucial to project success. Gas, sewer, power and phone were all coordinated and relocated as needed. Close coordination with affected property owners kept the project moving forward.

GBA provided full construction services, which included field observation of drilled shafts, retaining walls, RCB, roadway components, channel grading, riprap placement and final seeding and sodding.

 

Awards

KC ASCE 2018 Civil Engineering Project of the Year

PROJECT DETAILS
Client
City of Shawnee, Kansas
Contact Us
Let’s Create Something Remarkable Together
We will bring the complete team to meet your needs and move your project forward. Contact GBA today.
Reach Out
A Dedicated Team of Companies
The Power of Collaboration
GBA’s team of companies brings together a powerful combination of expertise and services to streamline your project’s success.
Meet Our Companies