USACE General Design Services Post-Katrina
BKI was selected by the U.S. Army Corps of Engineers, New Orleans District, in April 2006 to provide general design support services to the District under an indefinite delivery type contract. This contract was made shortly after Hurricane Katrina and was focused on the restoration and protection of the City of New Orleans Hurricane Protection levees, floodwalls and drainage pump station systems. The Corps relied on BKI's local knowledge and prior experience in design of levees, floodwalls and pumping stations to expedite these emergency repairs to the flood protection system. Projects assigned to BKI included:
- Preliminary analysis for determining the wind speed resistance of New Orleans Sewerage and Water Board Pump Stations Nos. 3, 6, and 7 to evaluate structural capacity to resist category 5 hurricane force winds in each structural element of these three drainage pumping stations which are the most critical outfall stations necessary to dewater the City of New Orleans in any future flood event.
- Preparation of right-of-way maps, plans and specifications for levee enlargement for the West Bank and Vicinity hurricane protection levee from Westwego to the Harvey Canal to restore the levee cross section to its full authorized evaluation which provides storm surge flood protection to a large portion of the west bank of Jefferson Parish.
- Plans and specifications, engineering during advertisement and engineering during construction for installation of two emergency generators and fuel supply system to operate the seven drainage pumps which currently operate at 60Hz power at the New Orleans Sewerage & Water Board Drainage Pump Station Number 6 in New Orleans. These generators will allow the S&WB to operate 4,000 CFS drainage pumping capacity even if the Central Power Plant or the S&WB 25Hz power grid goes offline during an emergency. This represents approximately 40% of the full capacity of the station.
- Plans and specifications, engineering during advertisement and engineering during construction for the hurricane levee enlargement, Chalmette loop levee, Verret to Caernarvon levee reach, in St. Bernard Parish, Louisiana. This project was a restoration to the erosion caused by Hurricane Katrina to the Caernarvon Hurricane Levee System to bring the levee cross section back to its authorized prestorm section and provides protection to the southern end of the St. Bernard Parish Hurricane Levee System.
- Preparation of plans and specifications for construction of West Bank and Vicinity Hurricane Protection Project, East and West of Algiers Canal.
- Fronting protection at five drainage pump stations including the New Orleans Sewerage & Water Board Pump Stations Numbers 11 & 13, Belle Chasse Pump Stations Number 1 & 2, and Planters Pump Station. This fronting protection includes concrete T-Walls across the discharge of each drainage pumping station with sluice gates at each horizontal pump and butterfly gates at the T-Wall for each vertical pump discharge pipe penetrating the floodwall to provide positive closure and prevents back siphoning through the pump bays during a pump outage during the peak hurricane storm surge at each station. Design of the fronting protection was based on the 100 year storm design criteria; flood proof study to protect vital equipment at all 22 New Orleans Sewerage & Water Board drainage pump stations and protect the Sewerage & Water Board Central Power Plant in New Orleans from flooding for future storm events similar to Hurricane Katrina. The design criteria was to offer flood protection all vital pump equipment and electrical systems up to the level of the floodwaters that each station experienced during Hurricane Katrina maintain pumping capacity during similar events in the future. Structural analysis for 150 mph wind loads was performed on all facilities included in this study to determine where each structure needed to be reinforced for category five hurricane force wind conditions. All designs were performed in accordance with the current design criteria established by the New Orleans District for levees and floodwalls based on lessons learned after Hurricane Katrina. Levee stability and floodwall analyses were based on the Spencer Method as well as the District's standard wedge method for stability to determine the most critical failure mode at each element to prevent any future levee or floodwall failures. Engineering during construction services provided by BKI included weekly job site visits, responding to contractors' requests for information, review of contractor submittals, and issuing design clarification drawings as necessary during the construction of each project.