Chlorine Residual Boosting in Distribution Water: Problems with Chlorine Application and Disinfection Byproducts - Part 2   Water Engineering & Management May 2003   Shin-ichi Tokuno
Part one of this article covered breakpoint chlorination and discussed the stability of chlorine, chloramine and Cl:NH3 after chlorination.
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Chlorine Residual Boosting in Distribution Water: Problems with Chlorine Application and Disinfection Byproducts - Part 1   Water Engineering & Management April 2003   Shin-ichi Tokuno
Previous research on the boosting of chlorine residual1 included how to increase low levels of chlorine disinfectants (free and combined chlorine) in the distribution system. Simple bench tests using a pocket photometer showed that there are no problems in boosting the low level of chlorine residual when boosting the same disinfectant to the water (e.g., free chlorine to free chlorine, or chloramine to chloramine). In the boosted chlorine residual, there is no significant instability in decay or dissipation during the time needed (72 hours) after boosting for the small utility distributors.

Chlorine Residual Boosting in Distribution Water   Water Engineering & Management January 2002   Shin-ichi Tokuno
When it comes to the methods to increase, or boost, the low level of disinfectant in distribution water, information is scarce
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Controlling Nitrification in a Water Distribution System Using Sodium Chlorite   Water Engineering & Management September 2001   Thomas L. O’Connor, Bart Murphy and Dr. John T. O’Connor, P.E.
Engineers set out to discover whether the direct addition of sodium chlorite to a water stream might be an effective nitrification control process.
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Trends in Sewer Overflow Management   Water Engineering & Management February 2001   Hubert Fleming, Ph.D., and David Slack
In this era of environmental stewardship, large cities and counties are faced with increasing pressure not only to deliver safe potable water supplies but also to treat combined and stormwater flows.
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Water Quality Deterioration in Distribution Systems: Part 3   Water Engineering & Management January 2001   Thomas L. O’Connor and John T. O’Connor
This article summarizes studies directed at controlling microbial growths in distribution systems supplied by groundwaters containing ferrous ion and naturally occurring microbial nutrients.

Reconsideration of Hydrostatic Leakage Allowance Provided in AWWA C-600 Standard   Water Engineering & Management November 2000   H. Steven Kanofsky and John Kasprzak
A sanitary commission conducts tests that show that there is no reason why the maximum leakage allowance shouldn't be reduced by half.

Water Quality Deterioration in Distribution Systems: Part 2   Water Engineering & Management November 2000   Thomas L. O'Connor and John T. O'Connor
This article assesses the role of microorganisms in distribution main corrosion and tries to understand th sources of these microorganisms.

Shake, Rattle & Roll: Pipe Bursting Provides Seismic Upgrade Solution in California   Water Engineering & Management October 2000   Jim Schill
One water district recently utilized pneumatic pipe bursting to help complete a seismic upgrade and retrofit one of its key water mains.

Water Quality Deterioration in Distribution Systems: Part 1   Water Engineering & Management October 2000   Thomas L. O'Connor and John T. O;Connor
For more than a century, scientists have tried to develop solutions to water quality deterioration caused by microorganisms.

Air Chamber Eliminates Water Distribution System Main Breaks   Water Engineering & Management April 2000
Burr Ridge, Ill., has celebrated its fifth year of nearly eliminating main breaks in its water distribution system thanks to an innovative concept developed by a water superintendent who studied the problem for more than 20 years.

Meeting the Long-Range Water Needs of a New Community   Water Engineering & Management March 2000   Charles K. Cothern

Optimizing Chemical Feed at Watertown Water Wells   Water Engineering & Management March 2000   Michael C. Olesen

Irrigation Pipeline Installed Over 14 Miles of Rough, Hilly Terrain   Water & Wastes Digest March 2000

New Ductile Iron Check Valve Stops Water Hammer In Louisiana Municipality   Water & Wastes Digest August 1999
After suffering years of water hammer problems and the resulting effect on maintenance personnel and equipment, the St. Charles Parish Municipality in Louisiana needed a product that would save them both time and money. Milliken Valve Company of Bethlehem, Pa., provided the answer.

Remote Wireless Meter Reading Technology Utilizes Only Digital Control Channels   Water & Wastes Digest August 1999
The challenge from a major natural gas transmission company was simple: develop a low cost, remote wireless technology that could provide daily automatic PC meter reading. The solution, developed by PGI International of Houston, Texas, was a product called Skylemetry.

Low Lead Bronze Water Meters: Common Questions   Water & Wastes Digest July 1999   Patrick T. Grayson
A question-and-answer session with Patrick T. Grayson, president of ABB Water Meters Inc., about low lead bronze water meters.

Water District Finds Alternative to Traditional Roofs   Water Engineering & Management February 1999

Flowmeter Helps Industry Measure Success   Water Engineering & Management December 1998
Many industrial companies rely on accurate metering of the liquid they process through their plants. When the metering fails, so does the process. A paper mill in West Monroe, Louisiana, Riverwood International, discovered this a few years ago when operators found that existing flowmeters were unreliable.

Analyzing Underground Water-Pipe Breaks In Residual Soils   Water Engineering & Management December 1998   Paul F. Hudak, Barry Sadler and Bruce A. Hunter
This study evaluates water pipe breaks caused by one of the world's most costly hazards: expansive soils.

Los Vaqueros Project: Blending Consistent Water Quality and Reliability with Concern For Environment   Water Engineering & Management July 1998   Bruce Ross
This $450 million project put environmental concerns on equal footing with technical and financial considerations in the planning process.

Specialized Motor Controller Manages Pump Surges During Starting and Stopping Cycles   Water Engineering & Management May 1998   Walter Lukitsch, P.E.
Fluid hammer can damage water systems, but specialized motor controllers can reduce surges and prolong system life.

All-stainless Tapping Sleeve Installed in Boca Raton Florida   Water & Wastes Digest May 1998
The managers at Boca Raton Service Company made a decision to tap into their 48-in. ductile water line. They wanted to make sure they had the best possible tapping sleeve available.

Upgraded Water System Helps Farmers Conserve Water and Save Money   Water Engineering & Management March 1998

Water District Solves Instability In Dual Pressure-Reducing Station Design   Water Engineering & Management March 1998   John Bengtson

GA Optimization Applied to Las Vegas Distribution System   Water Engineering & Management February 1998

Cooling Water Piping Project Provides Cost Effective Alternative to Stainless Steel   Water & Wastes Digest January 1998

Pipe with Sleeve Coupler Installed Under an Ohio Haul Road   Water & Wastes Digest January 1998

Motor Management Solves Water District's Pump Reliability Problem   Water Engineering & Management December 1997

Sliplining Meets Needs of Miami-Dade   Water & Wastes Digest November 1997

Nostalgic MWD Joins Computer Revolution   Water Engineering & Management October 1997

Roof Replacement Project Has Residents Staring Skyward   Water Engineering & Management October 1997

Old Redwood Distribution Line Continues On with Rehabilitation   Water Engineering & Management October 1997   Edward H. Russell
When major repairs of an old wooden distribution line became necessary, a polyethylene sliplining installation was the best option.

Survey Uncovers Million-Gallon-Per-Day Leak   Water Engineering & Management September 1997

Tunnel Boring Machine Carves Out Queens Water Tunnel   Water Engineering & Management September 1997

Inbound Technology and Wireless AMR   Water Engineering & Management September 1997   Larry Sears
With their wireless installation and better efficiency, automatic meter reading systems are destined to become a neccessity.

AMR: A Crucial Element in Developing a Comprehensive Customer Service Strategy   Water Engineering & Management August 1997   Don Schlenger, Ph.D.
Automatic meter reading can be expensive, but when looked at as a customer service instrument, it can be a valuable asset.

Saving Money Through the Use of Optimization Analysis   Water Engineering & Management August 1997   Jeffery Frey, P.E. and John Gransbury, CPEng
A district in Colorado used a genetic algorithm optimization process to meet projected demands for the year 2015 while saving money.

City Cuts Costs, Improves Accuracy with Radio Frequency Meter Reading   Water Engineering & Management August 1997   Joe Hastreiter
Officials in Aiken, S.C., found that reading water meters with radio frequency systems can increase revenue and decrease labor costs.

Water System Metering Modernization Eases Metropolitan Money Crunch   Water Engineering & Management July 1997

Shutting Down Reservoirs for Renovation   Water Engineering & Management July 1997   Charles T. Duncan
Sixty-one reservoirs required renovation, and the district needed a plan to shut down the facilities without disrupting service.

Microbiological Corrosion in Municipal Water Treatment Plant Piping   Water Engineering & Management May 1997   Helmut Thielsch and Susan Freeman
Municipal water treatment plant experiences pipe deterioration caused by microbes and bacteria.

An Alternative to Removing Lead-Based Paint: Overcoating   Water Engineering & Management May 1997   Richard DaSilva
Stripping and repainting a water tank can be more costly than a town can afford. Under the right conditions, overcoating is an affordable alternative.

Propeller Meter Undergoes Its Own Improvements   Water Engineering & Management March 1997

Meter Management: Best Practices for Water Utilities   Water Engineering & Management March 1997   Donald L. Schlenger, Ph.D.
Choosing the right meter for your utility can have a great impact on the options available to you in the future.

Air in Pipelines: Sources, System Impact, Removal by Air Valves   Water & Wastes Digest March 1997   By Phillip O. Landon
When air is allowed to accumulate in pressurized pipelines, efficiency is sacrificed and serious damage can occur. Air valves are a cost effective, reliable method of improving efficiency and solving air-related surge problems.

Inadequate Fire Protection Leads NASA Center to Implement Repair Program   Water Engineering & Management January 1997   David J. Braidich and Robert M. Puzak
A two-system setup worked well in the 1940s, but a modern, unified network has taken its place.

Protecting Water Storage Tanks in an Era of Environmental Compliance   Water Engineering & Management November 1996   Dallas Finch
Learning more about the causes of corrosion in an on water storage tanks can lead to the right coating choice for the tank site.
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Hunting Down Water Leaks   Water Engineering & Management October 1996   Brian Dumbleton
Computers are now playing an ever-increasing role in the monitoring and control of leaks.

Determining the Economical Optimum Life of Residential Water Meters   Water Engineering & Management September 1996   Dr. Hans D. Allender, P.E.
When should you replace a water meter? A methodology for the calculation of this optimum age is presented.

AMR Installation: Make Your Own Decision   Water Engineering & Management August 1996   Maritza Jackson
When faced with a majority of old meters performing poorly, the City of Pontiac, Michigan, not only replaced these meters, but also the hand-held meter reading devices.

Water Utilities Use AMR to Reduce Costs, Improve Services   Water & Wastes Digest July 1996   Heather Freise
Milwaukee Water Works has a problem. Unfortunately, it is not a problem unique to this utility.

Chemical Cleaning Process for Water Systems   Water Engineering & Management March 1996   Martin J. Plishka, Ph.D. and Myron Shenkiryk
A new process, tested and certified by NSF International under Standard 60, for cleaning water distribution systems is available

Indianapolis Water Company Goes to School   Water Engineering & Management March 1996
AWWA-approved, high density polyethylene piping material provided a solution to a school waterline extension.

Corrosion Control: Begin with pH Adjustment   Water Engineering & Management January 1996   Robert A. Leitch, P.E.
While many corrosion control options exist, increasing the pH of the groundwater to a non-acidic level reduces the corrosive nature.

Water Storage Evaluations: Are You Getting All the Answers and Getting Them Often Enough?   Water Engineering & Management January 1996   Daniel J. Zienty
As part of annual public works planning, it is important to schedule in-house inspections of water storage facilities and provide for minor maintenance.

Performance Factors and Installation Procedures for AWWA Butterfly Valves: Part II   Water Engineering & Management December 1995   Joseph W. Hoff, P.E., and Albert W. Libke, P.E.
Part II of this article gives guidelines on the installation of butterfly valves.

Residential Backflow Prevention Begins at User Connection   Water Engineering & Management November 1995   Wally Gross
Backflow prevention programs are now being made feasible for single family residences

Performance Factors and Installation Procedures for AWWA Butterfly Valves: Part I   Water Engineering & Management November 1995   Joseph W. Hoff, P.E., and Albert W. Libke, P.E.
Part I of this article discusses the factors that influence a butterfly valve's performance.

Pipe Expansion Project Quickly Increases Production Capacity   Water Engineering & Management October 1995   Bill Swichtenberg
A project to install over 41,000 linear feet of 60-in. pipe increaseda Michigan water plant's pumping rate.

Energy Act Spurs Use of More Efficient Fixtures   Water Engineering & Management September 1995   Naeem Qureshi
New regulations relating to water saving devices will enable utilities to help customers conserve water.

Multimedia Computer Applications in Control Systems   Water Engineering & Management August 1995   Keith R. Lenart
Third article in a series looks at uses of multimedia capability in control systems.

Maintenance History of Four Steel Water Tanks   Water Engineering & Management July 1995   Walter Neumann, Jr. and Wade D. Newman
A survey looked the maintenance painting costs for four large-capacity steel water tanks

Better Large Meter Accuracy Increases Revenues, Reduces Water Losses   Water Engineering & Management January 1995   Mark C. Carney, John Travis and Jeffrey A. Smith
Large water meters help public and private water utilities to battle higher costs while striving to keep water rates down.

Ohio City Benefits From AMR Decision   Water Engineering & Management January 1995   Dennis Zentarski
A 34-item list of potential benefits helped persuade a city council to give AMR a chance.

Research Needs for Water Distribution System Rehabilitation   Water Engineering & Management August 1994   Dr. Ahmad Habibian
Important factors that have to be considered before water distribution system mains can or should be repaired, rehabilitated or replaced are discussed.

Application Possibilities Grow for Plastic Pumps   Water Engineering & Management June 1994   Ken Comerford
A review of the role of plastic pumps in water pollution control systems.