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Selecting Flow Monitoring Technologies for Your Agency
Water & Wastes Digest
July 2005
By Patrick Stevens
The EPA recognized the difficulty faced by municipalities as they try to sort through the performance claims by manufacturers of environmental equipment, and several years ago developed the Environmental Technology Verification (ETV) Program to verify performance of several types of air- and water-related equipment including flow meters.
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In Control & Beyond Expectations
Water & Wastes Digest
July 2005
By William F. Verona and Robert Rumelfanger
“This system has been operating beyond expectations,” commented Philip D’Angelo of JoDAN, “The treated water is well within the compliance limits mandated by the utility’s discharge limits, at only a fraction of the cost previously observed.
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Chesterfield County Gains Sewer Flow Monitoring Freedom
Water & Wastes Digest
April 2005
By Marcia Kinley
A major force within the county’s Utilities Department is their steadfast commitment to utilize only innovative technology to maintain their water and wastewater systems.
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Going with the Flow
Water & Wastes Digest
February 2005
By Brian Roughan
Appomattox, Va. River Water Authority recently installed an electromagnetic flowmeter in their fluoride feed line to measure instantaneous and total flow
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Finding Leaks Leads to Saving Money
Water & Wastes Digest
February 2005
By Betsy Loeff
We hate the expression unaccounted-for water,” Carl Yates, the utility’s general manager, said. “So we started using our SCADA system to monitor nighttime flows in an effort to understand consumption patterns and identify potential problems.”
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An Asset Coming of Age
Water & Wastes Digest
February 2005
By John Hengesh
At a basic level, AMR technology enables accurate and timely meter reading with unprecedented efficiency.
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Accurate Flow Monitoring Aids Billing Process
Water & Wastes Digest
April 2004
WWD Staff
When a new regional wastewater treatment facility opened in north Kern County, Calif., the nearby city of Shafter closed its own facility and began piping its residential wastewater to the new plant. Shafter, located 17 miles northwest of Bakersfield, Calif., has 12,000 residents. For billing purposes, the city needed to precisely monitor daily flow to the plant. The operators needed to remotely monitor flow between the city’s collection system and the regional treatment facility.
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Advances in Magmeter Technology
Water & Wastes Digest
April 2004
By Jeffrey A. Galvin
For many reasons, applications for magmeters have mushroomed in a number of key markets, including those in water and wastewater.
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CMOM is Coming
Water & Wastes Digest
December 2003
Susan McHugh
The U.S. EPA continues to develop proposed National Pollutant Discharge Elimination System (NPDES) permit requirements for capacity, management, operation and maintenance (CMOM) programs for municipal sanitary sewer collection systems. New CMOM programs for municipal sanitary sewer collection systems have been designed to limit the number of sanitary sewer overflows.
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Montgomery County Works With EPA To Upgrade Infrastructure
Water & Wastes Digest
May 2003
More and more communities face the dual problem of aging infrastructure and overdevelopment due to population growth. Under the Federal Clean Water Act (CWA), EPA is keeping a vigilant eye on the problem. When a community does not meet CWA regulations for sewage overflow, EPA works with that community through long-term loans and expertise to develop a solution. Such is the case in Montgomery County, Ohio.
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Flow Monitoring Springboards City to System-wide Sewer Management Solution
Water & Wastes Digest
April 2003
The forward-looking Metropolitan Sewer District of Greater Cincinnati (MSDGC) saw a dynamic model of most of Cincinnati's collection system as the tool that would support improved sewer system management, including sanitary sewer overflow (SSO) and combined sewer overflow (CSO) control, planning, and operations.
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How Does Pump Suction Limit the Flow?
Pump Source
April 2003
One of the claimed advantages of centrifugal pumps over positive displacement pumps is their ability to operate over a wide range of flow. Since a centrifugal pump operates at the intersection of a pump curve and a system curve, by varying the system curve the operating point of the pump easily is changed. The convenience and simplicity of such flow control by the discharge valve throttling comes at a price because a pump is forced to run either to the left or right of its best efficiency point (BEP). The flow must be limited on both sides of the BEP.
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At Work on Flow Metering Devices
Water Engineering & Management
January 2003
Professional flow data analysis now is accomplished easilyby the city's own engineering staff utilizing data management and report generation software.
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Smoking Out Sewer Leaks: An Overview of Smoke Testing, an Important Part of I&I Studies
Operations & Maintenance Supplement
November 2002
Paul Tashian, Superior Signal Company, Inc.
Smoke testing is a relatively simple process that consists of blowing smoke mixed with large volumes of air into the sanitary sewer line usually induced through the manhole. The smoke travels the path of least resistance and quickly shows up at sites that allow surface water inflow. Smoke testing is a method of inspecting both the main lines and laterals. Smoke travels throughout the system, identifying problems in all connected lines?even sections of line that were not known to exist or thought to be independent or unconnected.
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Smoking Out Sewer Leaks: An Overview of Smoke Testing, an Important Part of I&I Studies
Water & Wastes Digest
October 2002
Paul Tashian, Superior Signal Company, Inc.
Although video inspection and other techniques certainly are important components of an I&I survey, research has shown that approximately 65 percent of all extraneous stormwater inflow enters the system from somewhere other than the main line (see private sector diagram). Smoke testing is a method of inspecting both the main lines and laterals. Smoke travels throughout the system, identifying problems in all connected lines?even sections of line that were not known to exist or thought to be independent or unconnected.
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Concord, N.C. - A Proactive Approach to Beginning a CMOM-Based Program
Water Engineering & Management
August 2002
Ron Geiger, PE, and Todd Schuster
The federal government is in the process of establishing a CMOM philosophy for wastewater collection and treatment facilities that hinges on an aggressive, proactive approach, calling for utilities to act like investigative reporters rather than firefighters. Eventually, utility providers will have to follow federal CMOM guidelines, and states may establish similar guidelines.
PDF Version
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Meters - High-accuracy Stormwater, CSO Flow Monitoring
Water & Wastes Digest
July 2002
Ultrasonic transit-time flowmeters can be used to good effect for meeting specific site monitoring and documentation requirements by providing highly accurate and continuous flowrate measurement during dry- and wet-weather conditions.
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Surge Suppression Protects Utility Authority
Water Engineering & Management
September 2000
With its 34 water wells and 280 sewage lift stations, the Escambia County Utility Authority (ECUA) in Pensacola, Fla., is the largest water provider and wastewater manager for a population of about 85,000 in the Florida Panhandle. It also is extremely prone to lightning strikes.
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Multi-year Project Wraps Up With Installation of Permanent Flowmeters throughout Dallas
Water & Wastes Digest
January 2000
The City of Dallas recently awarded a $1.3 million contract to Byrd/Forbes Associates, Inc., which will employ American Sigma 950 Portable Area Velocity Flow Meters to perform temporary and permanent flow monitoring. The overall project includes GPS (x, y, and z) of each manhole for use in updating system maps and construction of a dynamic hydraulic model.
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Dealing with EPA Flow Monitoring Compliance
Water Engineering & Management
May 1998
Amy Fardo Patsey, E.I.T.
Flow monitoring devices can help prevent raw sewage discharges and bring municipalities into compliance with the Clean Water Act.
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Accurate Flow Critical for Successful I & I Studies
Water & Wastes Digest
September 1996
In the fight to relieve pressure on wastewater treatment plants from having to treat excessive amounts of clean water pouring into sewer systems from rainfall events, municipalities and their consultants have been building hydraulic models to determine the most cost-effective method for rehabilitating deteriorating systems.
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