North & South Florrisant Drainage Pump Station Rehabilitation Project

St. Bernard Parish Government, Department of Public Works, Chalmette, LA

On August 29, 2005, Hurricane Katrina made landfall along the Louisiana / Mississippi state border causing widespread wind damage and flooding from storm surge and levee failures. St. Bernard Parish, Louisiana (Parish) experienced some of the greatest devastation from storm surge with nearly the entire parish flooding due to levees that were overtopped and failed. As a result, the North and South Florrisant Drainage Pump Stations were seriously damaged.

The North Florrisant Drainage Pump Station (NFDPS) and South Florrisant Drainage Pump Station (SFDPS) are generally located in the northeastern end of St. Bernard Parish near the communities Reggio and Yscloskey, respectively.

A contract authorizing the Design, Bidding, and Construction Phase engineering services for this project was executed between H. Davis Cole & Associates, LLC (HDCA) and the St. Bernard Parish Government on February 15, 2007 with an effective date of October 16, 2006.

The construction of the approximately $3.0 million project was funded by the Federal Emergency Management Agency (FEMA) under the Public Assistance Program. The General Contractor for the project is Lou-Con, Inc. of Meraux, LA.

NORTH FLORRISANT DRAINAGE PUMP STATION REHABILITATION

The NFDPS is located atop the St. Bernard Parish Hurricane Protection Levee (SBPHPL) in community of Reggio at the eastern end of St. Bernard Parish, LA. Specifically it is located near the intersection of Louisiana Highway 46 (Florrisant Highway) and Louisiana Highway 300 (Delacroix Highway).

The NFDPS pumps storm water collected by Bayou la Loutre and discharges the water into the wetlands located along the north side of the SBPHPL. Bayou la Loutre is aligned in a northeasterly direction along the south side of the SBPHPL (north side of LA 46 Florrisant Highway) and collects storm water from developed areas along the north side of LA 46 (Florrisant Highway).

The Pre-Katrina NFDPS consisted of two (2) hydraulic type axial flow pumps which pushed storm from Bayou la Loutre through two (2) 16-inch diameter pipes through the SBPHPL to the wetlands located along the north side of the levee. Each 16-inch diameter pipe is approximately 75 feet long. The pumps were enclosed in a pre-engineered metal building nominally 12 feet by 20 feet in plan and approximately 9 feet high at the side walls.
The NFDPS pumps were driven by diesel engine powered hydraulic modules which provided motivation to in-line axial flow pump impellers installed within the two (2) 16- inch pipes which penetrate the SBPHPL. The pumps were Hydraflo Pumps (Model HAC316 by MWI Pump, Deerfield Beach, FL) rated to pump 7,700 gallons per minute (GPM), or 17.2 Cubic Feet per Second (CFS), each at 12-feet of total dynamic head (TDH).

The redesigned NFDPS basically replaces the pre-Katrina station in-kind with the exception that the pumps, building, and fuel tank will be constructed upon an elevated (approximately 18 feet above existing grade) reinforced concrete platform to mitigate against future flooding during similar storm events. This reinforced concrete platform consists of pre-cast, pre-stressed concrete piles, each 110 feet long topped with pre-cast concrete slab sections. The pre-cast concrete components of the structure and tied together with structural steel members.

SOUTH FLORRISANT DRAINAGE PUMP STATION REHABILITATION

The South Florrisant Drainage Pump Station (SFDPS) is located atop the South Florrisant Levee (SFL) near the community of Yscloskey at the eastern end of St. Bernard Parish, LA. Specifically it is located near the intersection of Louisiana Highway 46 (Florrisant Highway) and Louisiana Highway 300 (Delacroix Highway), approximately 1,150 feet south of 840 Florrisant Highway.

The SFDPS pumps storm water collected by the canal along the north side of the SFL to the wetlands located along the south side of the SFL. The canal along the north side of the SFL is aligned in a northeasterly direction along the north side of the SFL (south side of LA 46 Florrisant Highway) and collects storm water from developed areas along the south side of LA 46 (Florrisant Highway).

Prior to Katrina, the SFDPS consisted of two (2) hydraulic type axial flow pumps which pushed storm water from the canal through two (2) 24-inch diameter pipes through the SFL to the wetlands located along the north side of the levee. Each 24-inch diameter pipe is approximately 75 feet long. The pumps were enclosed in a pre-engineered metal building nominally 20 feet by 24 feet in plan and approximately 12 feet high at the side walls.

The SFDPS pumps were driven by diesel engine powered hydraulic modules which provided motivation to in-line axial flow pump impellers installed within the two (2) 24- inch pipes which penetrate the SFL. The pumps were Hydraflo Pumps (Model HAC324 by MWI Pump, Deerfield Beach, FL) rated to pump 15,300 gallons per minute (GPM), or 34.1 Cubic Feet per Second (CFS), each at 12-feet of total dynamic head (TDH).

The redesigned SFDPS basically replaces the pre-Katrina station in-kind with the exception that the pumps, building, and fuel tank will be constructed upon an elevated (approximately 18 feet above existing grade) reinforced concrete platform to mitigate against future flooding during similar storm events. This reinforced concrete platform consists of pre-cast, pre-stressed concrete piles, each 110 feet long topped with pre-cast concrete slab sections. The pre-cast concrete components of the structure and tied together with structural steel members.