Taking Control of CSOs
Faruk Oksuz, Carlton Ray, Kerry Bruce, David Egger, and Lawrence P. Jaworski
Cities successfully apply 21st century approaches to 19th century infrastructure, improve quality of life for urban dwellers
Long-term programs to manage combined sewer overflows (CSOs) often cost billions of dollars and entail multidecade implementation periods. The CSO control and minimization programs that have been initiated since the early 1990s now are being implemented. Lessons learned from the planning, design, and implementation approaches of major CSO cities can provide guidance that extends beyond traditional CSO solutions. Read full article (login required)
Bring 'Em Back to the Waterfront
Christopher P. Martin and Daniel Bentivogli
Buffalo, N.Y., must remediate combined sewer overflow for canal project to succeed
Once the busiest port on the Great Lakes, Buffalo, N.Y., now has a largely underused waterfront. An ambitious plan is under way to redevelop this area, emphasizing the history of the Erie Canal.
However, the canal terminus also is the terminus of the Hamburg Drain, a combined sewer owned and operated by the Buffalo Sewer Authority (BSA). This drain is the site of BSA’s fourth-largest and third-most-active combined sewer overflow (CSO). It must be remediated for the Erie Canal Harbor Project to succeed. Read full article (login required)
Building a Community-Based Watershed Group From the Ground Up
Vallejo, Calif., alliance brings together utility, environmentally minded customers
In 2005, a local fisherman approached the Vallejo (Calif.) Sanitation and Flood Control District with a simple problem. He was concerned about the water quality in Lake Chabot and hoped the district would help find solutions to the lake’s sediment, temperature, and pollution problems.
So the district helped environmentally minded residents form the Vallejo Watershed Alliance. Since then, the group has grown and found new ways to serve the community. Read full article (login required)
Operations Forum Features
Maximize Pump Performance
Paul Maier, Randy White, Steve Connell, Chris King, and Richard Metzger
A simple interior treatment can keep pumps operating at manufacturer specifications
Pumping systems account for nearly 20% of global power demand and 25% to 50% of the energy used in certain industrial and municipal operations. So, anything that produces even moderate gains in pumping efficiency can greatly reduce worldwide energy use, costs, and greenhouse gases.
The Monroe County (N.Y.) Water Authority (MCWA) has found a simple method for maximizing pump efficiency. Read full article (login required)
Felix Belanger, James Brescol, and Matt Alpaugh
A cost-effective approach to evaluating hydrogen sulfide deterioration in a concrete interceptor
The Shades Valley Transfer Line (SVT) in Jefferson County, Ala., is only 24 years old, but high hydrogen sulfide conditions early in its operation have its owners concerned about its overall condition. The Jefferson County Environmental Services Department (ESD) owns and operates the 92,000-ft (28,000-m) SVT as part of its 3100-mi (5000-km) collection system.
However, due to a limited budget, ESD robotically inspecting the entire 92,000 linear ft (28,000 linear m) of reinforced-concrete pipe was out of the question, so the agency sought an evaluation process that would identify the worst segments on the interceptor so that complete inspections could be limited to those segments.
The solution was a risk-based approach that uses a model to tie accepted equations for the production and release of hydrogen sulfide gas to the corrosion of the interceptor. Read full article (login required)
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