One of our goals at Restoration and Resilience is to offer a better analysis of green jobs potential from conservation work than past jobs multipliers have provided. To do this, we’ll examine case studies of completed and proposed wetland restoration projects. Today we are presenting the third in a series of posts that lay out estimates of job creation from restoration of the Central Wetlands Unit, a degraded marsh on the eastern edge of New Orleans. Bear in mind that we rely on assumptions and estimates throughout our analysis, and we encourage you at the outset to send us feedback on our methods.
Source: Municipal Sewer & Water Magazine
In our previous two posts on the Central Wetlands Unit (CWU), we looked at the direct and indirect jobs that could be generated there from dredging and site preparation. In this post, we estimate the employment generated by installation of water provisioning systems in the basin. Based on our calculations, an $11.02 million piping project completed over a period of fifty weeks could create nearly 175 jobs in Louisiana.
Previous Work on Water Provisioning in the Central Wetlands Unit
Water management is critical to the long-term success of the CWU restoration project, as cypress trees and other wetland plants thrive within certain ranges of salinity and seasonal inundation. In addition, it is important from both a public health and ecosystem management perspective to ensure compliance with state and federal standards regarding tertiary treatment of water running into the basin. As such, the Central Wetlands Unit will be managed using only disinfected, treated wastewater from local treatment facilities. Plants in the restored wetland will use the nutrients in this wastewater as fertilizer for their development, lowering the compliance costs of sewage treatment for Louisiana's largest city and its eastern suburbs.
Estimating the Cost of a Water Provisioning System in the Central Wetlands
Detailed Map of the Central Wetlands Unit, showing areas labeled A1 – A4 (Source: Office of Environmental Affairs, City of New Orleans)
As part of preliminary planning for the Central Wetlands Unit restoration, the New Orleans-based engineering firm Waldemar S. Nelson outlined fourteen scenarios for wastewater distribution systems in the basin. At the low end, Waldemar Nelson estimated that a system discharging one million gallons per day (MGD) of treated wastewater from the Riverbend Oxidation Pond would incur a project cost of about $75,000. At the high end, the firm estimated that a system of pipes and outfall channels discharging 78 MGD into the A3 and A4 units of the Central Wetlands would cost $33.99 million (see map at right for the locations of units A1, A2, A3 and A4 in the Central Wetlands).
To estimate the maximum potential for job creation, we based our job estimates on a more ambitious design that would discharge 100 MGD into units A2, A3, and A4 of the Central Wetlands. Using cost estimates from several Waldemar Nelson scenarios, we estimated that such a project would cost approximately $11.02 million (or $13.78 million if one includes 25% contingency costs, as is common for coastal restoration projects).
The proposed system would channel 94 million gallons of treated wastewater per day from Orleans Parish and 6 million gallons per day from St. Bernard Parish through nearly 90,000 linear feet of pipes and outfalls coursing through the CWU. To handle this volume of water, the discharge system would require pipe diameters ranging from 28” (14,000 feet of pipe) to 54” (20,750 feet of pipe) for the primary headers extending from the East Bank Sewage Treatment Plant in Orleans Parish and the Munster Facility in St. Bernard Parish. The secondary outfalls from each facility’s header pipes would be 3” in diameter.
How Many Jobs Could Be Created by This Pipeline Project?

We estimate that a team of six people, consisting of one civil engineer, two civil draftsmen, and three technicians, could finalize the layout of the piping system over a period of three months. After their plans for water provisioning were completed, work would commence on both the piping system and a network of platform walkways. The walkways would provide access for construction and maintenance crews to install fixtures, check valves spaced along the pipe length, and inspect tubes for leaks. Later, the walkways would be used in the day-to-day operations of the wastewater distribution system.
We estimate that this construction work (pipe installation and platform walkway construction) could be completed by a team of sixty-six workers. This larger group would be subdivided into three sub-crews. Each sub-crew would have twenty-two workers (two supervisors, fifteen construction laborers, and five operating managers). We assume that their respective average wages would be $26.23 (supervisors), $16.91 (operating engineers), and $12.48 (construction laborers) per hour, based on Occupational Employment Statistics wage data from the Labor Department.

We estimate that the pace of pipe installation and platform walkway construction by each sub-crew would be one linear foot every four minutes, equivalent to 15 feet per hour or 120 (= 15 ft./hr. * 8 hours) feet per day, assuming an eight-hour work day. Because the three sub-crews would be working simultaneously in different parts of the CWU, the pace of installation by all three crews would be 15 + 15 + 15 = 45 ft. per hour, equivalent to 360 ft. per day.
The 43,675 feet of platform walkways would run along the length of the pipelines, but not that of the outfall channels. We assume that construction of 89,875 ft. pipes and 43,675 ft. of platforms, done by three sub-crews of 22 people installing pipe for eight hours each day during the regular work-week (i.e.) from Monday through Friday, would take 89,875 ft. * 1 day / 360 ft. * 1 week / 5 days = approx. 49.93 weeks, equivalent to roughly a year of work.
To install the pipeline and construct the adjacent platforms, the workers would need lumber, tubes, valves, work tools, and vehicles like trenchers, tractors, and dumptrucks. We estimated that the total cost of materials and machinery would be approximately $9.02 million, while the direct jobs payroll for the project would be roughly $2.01 million. These figures are shown in the below chart (at right).

Converting the labor hours into full-time equivalents (FTE) of 2,000 work-hours per year, we estimate that pipe construction in the Central Wetlands Unit would create 67.4 FTE direct job years in civil engineering and construction. Using the 2006 RIMS II employment multiplier for waste management and remediation services (2.687 jobs), and adjusting its impact down 6% for changes in wage levels, we estimate that an additional (2.687-1) * (1-0.06) * (67.4) ≈ 106.8 indirect and induced job years would be generated at pipe manufacturing firms, lumber yards, and other industries supporting the project.
With a total budget of $11.02 million and approximately 174 (≈ 174.2 = 67.4 direct jobs + 106.8 indirect/induced jobs) FTE job years stemming from the project, we estimate that the jobs per budgeted $1 million ratio would be 174.2 jobs / 11.02 ≈ 15.80. This is less than the cumulative employment/budget outlay ratio from dredging (28.96 jobs per $1 million) that we estimated in the previous post on the Central Wetlands Unit. However, it is in line with employment/spending ratios for other green economic activities like building retrofits, estimated at 16.66 jobs per $1 million by researchers from the Political Economy Research Institute (PERI).
With water and mud in place, the foundation for the restored wetland will be established. However, the most visual demonstration of its health will be the growth of trees and grasses, which will in turn encourage the return of local fauna. In our next post on the Central Wetlands Unit, we will look at how many jobs could be generated from tree planting and related horticultural work in the basin.
