sanitary sewer Articles | Environmental XPRT

A New Method of Predicting Rainfall Dependent Inflow and Infiltration

ABSTRACT There are many hydrological models available to quantitatively characterize rainfall dependent inflow and infiltration (RDII) in a sanitary sewer system, most of which were first derived for quantifying rainfall surface runoff process and later found many applications in studying the issues of combined sewer overflows (CSO). However, it has been long recognized that profound ...

Oct. 12, 2007

By Water Environment Federation (WEF)

Another Sewer from Hell - The City of Richmond, British Columbia, Canada Experience

ABSTRACTThe City of Richmond has a population of approximately 180,000 and is located on a flood plain at approximately sea level. These physical attributes present numerous challenges with underground utility design, including sanitary sewers. On January 21, 2005 the City declared a local state of emergency near the intersection of No. 3 Road at Cook Road due to the development of a large ...

Oct. 21, 2006

By Water Environment Federation (WEF)

Protecting Homes from Sewage Backup - Metropolitan Sewer District of Greater Cincinnati’s Water in Basement Prevention Program

ABSTRACT Many customers of the Metropolitan Sewer District of Greater Cincinnati (MSDGC) have experienced basement backup due to surcharging of the sanitary and combined sewer systems. The surcharging was caused by excessive infiltration and inflow entering the sanitary sewer system and a lack of capacity in the combined sewer system. As part of the Consent Decree that MSDGC signed with the ...

Oct. 12, 2007

By Water Environment Federation (WEF)

Getting your money’s worth - collecting and utilizing accurate flow monitoring data for collection system analysis and modeling

A comprehensive flow monitoring network can provide powerful insight about the performance of a sanitary sewer collection system. Accurate flow monitoring data reveals numerous system details, such as sewer usage patterns, the presence of sediments, groundwater infiltration, rainfall-dependent inflow and infiltration, stream intrusion, and sewer exfiltration or leakages. Knowledge of these ...

Oct. 12, 2007

By Water Environment Federation (WEF)

An Update on Louisville MSD`s Basement Backflow Prevention Program - 10 Years and 6,700 Installations Later

ABSTRACTLouisville and Jefferson County Metropolitan Sewer District (MSD) is responsible for stormwater and wastewater service for the Louisville, Kentucky metropolitan area. A longstanding problem for MSD has been basement flooding due to sewers that are surcharged from wet weather. A non-traditional program was developed by MSD as a means to address this problem in a cost effective and timely ...

Oct. 21, 2006

By Water Environment Federation (WEF)

Getting your money’s worth - collecting and utilizing accurate flow monitoring data for collection system analysis and modeling

Abstract A comprehensive flow monitoring network can provide powerful insight about the performance of a sanitary sewer collection system. Accurate flow monitoring data reveals numerous system details, such as sewer usage patterns, the presence of sediments, groundwater infiltration, rainfall-dependent inflow and infiltration, stream intrusion, and sewer exfiltration ...

Oct. 12, 2007

By Water Environment Federation (WEF)

Tractive force design for self-cleansing of sanitary sewers

The new edition of the WEF FD 5/ASCE MOP 60 manual recommends use of the tractive force approach for self-cleansing design of gravity sanitary sewers. The tractive force approach is a major improvement in designing gravity sewers to achieve self-cleansing. This approach results in a self-cleansing slope value, Smin, for the combination of sewer diameter, design particle size, d, and design ...

Oct. 12, 2007

By Water Environment Federation (WEF)

Risk Analysis for SSO Projects

ABSTRACT In 1999 the City of Atlanta negotiated a comprehensive settlement titled the First Amended Consent Decree (FACD) with the United States Environmental Protection Agency (EPA) and Georgia Environmental Protection Division (EPD) to address its sanitary sewer system to prevent future Sanitary Sewer Overflows (SSOs). The Clean Water Atlanta Program Management Team (PMT) has ...

Oct. 12, 2007

By Water Environment Federation (WEF)

Sanitation

Wastewater collection The standard sanitation technology in urban areas is the collection of wastewater in sewers, its treatment in wastewater treatment ...

Apr. 5, 2012

By IWA Publishing

How to Nearly Double Sewer Rates without Ratepayer Revolt

In early 2005, the City of Indianapolis identified $435 million in stormwater and sanitary infrastructure needs for 2005-2008. In order to finance these projects, the city needed to raise sanitary sewer rates by 87 percent and stormwater rates by 80 percent over a three-year period. The Department of Public Works developed and implemented a public relations campaign to disseminate the messages ...

Oct. 20, 2006

By Water Environment Federation (WEF)

WDRs: Developing an Effective Sanitary Sewer Management Plan Utilizing Innovative GIS Solutions

As California’s wastewater collection system infrastructure begins to age, the need to proactively manage this valuable asset becomes increasingly important. The first step in this process is to have a reliable reporting system for Sanitary Sewer Overflow (SSOs). Although there are some data systems to record spills and various spill-reporting requirements have been developed, inconsistent ...

Oct. 12, 2007

By Water Environment Federation (WEF)

Low pressure sewer system for affluent existing neighborhood

The River Oaks subdivision is an affluent, mature residential community located in Fairfax, County Virginia which includes 114 existing single family dwelling units with individual septic tank drainfields. The Fairfax County Health Department determined that several drainfields have failed and expressed concern that others would soon fail. In order to prevent the health and environmental problems ...

Oct. 12, 2007

By Water Environment Federation (WEF)

Developing an Effective Sanitary Sewer Management Plan Utilizing Innovative GIS Solutions

As California’s wastewater collection system infrastructure begins to age, the need to proactively manage this valuable asset becomes increasingly important. The first step in this process is to have a reliable reporting system for Sanitary Sewer Overflow (SSOs). Although there are some data systems to record spills and various spill-reporting requirements have been developed, inconsistent ...

Oct. 12, 2007

By Water Environment Federation (WEF)

Salmon Processor

The water is from a salmon processor where they are using an Andritz 3 phase decanter centrifuge to recover the oil in the salmon parts after packaging the salmon for human consumption. The oil is very valuable for use in the health food industry. The Andritz centrifuge recovers 90% of the oil from the wastestream, but leaves a residual oil emulsion that needs to be treated prior to discharge to ...

Jan. 29, 2009

By Integrated Engineers Inc.

Process to Estimate Sanitary Sewer Pipe Remaining Life Provides MWWSSB Remedial Decision Information

ABSTRACTA condition assessment study for the Water Works and Sanitary Sewer Board of the City of Montgomery’s (MWWSSB’s) West Catoma Interceptor (WCI) was conducted in 1998 and 2003. The WCI was evaluated in 1998 using core sampling, closed-circuit television, and manhole (MH) inspections. Approximately 193 MHs and 65,000 linear feet (LF) of pipe were inspected. A subsequent study conducted in ...

Oct. 21, 2006

By Water Environment Federation (WEF)

Identifying and Strengthening “Weak Links” in the Fog Management Chain

ABSTRACTRecently, EPA presented statistics that cited grease accumulation in sewers as the leading cause of sewer blockages resulting in sanitary sewer overflows (SSOs). Such blockages can be attributed to fats, oils, and grease (FOG) discharged from food preparation and manufacturing facilities, concentrated residential areas, and even single family homes. Municipalities and wastewater system ...

Oct. 21, 2006

By Water Environment Federation (WEF)

Economic analyses for optimizing the construction of separate sewer in a hybrid sewer system

Metropolitan Taipei located in north Taiwan uses a hybrid sewer system consisting of mostly separate sewer for the populated regions, and partly combined sewer for less populated regions. This study used the concept that Marginal Cost of Control (MCC) equals to Marginal Benefits of Control (MBC) to establish the method for studying the optimal household connection percentage, and the most ...

Nov. 30, 2010

By IWA Publishing

Sewer rehabilitation for capacity increase fast track solution for providing required capacity

The large North Carolina municipality had an obligation to provide sanitary sewer services to a development located in the downtown area. The existing sewer in the area was not sufficient to meet the demand and the increased capacity needed to be provided within three months. This paper outlines the required sewer assessment procedure and rehabilitation method selection. The ultimate solution ...

Oct. 12, 2007

By Water Environment Federation (WEF)

There’s No Use Crying Over Spilled Sewage: Using Standby Lift Station Pumps to Prevent SSOs before They Happen

Power outages and unforeseen mechanical failures create the potential for system distress and sanitary sewer overflows (SSOs) in wastewater collection and treatment systems. In accordance with a lawsuit initiated by Mobile Bay Watch (Mobile, Alabama), the Mobile Area Water and Sewer System (MAWSS) chose to install an automatic dry priming backup system to increase system reliability and enable ...

Oct. 20, 2006

By Water Environment Federation (WEF)

How Much Could You Save by Avoiding a Consent Decree?

In 2012, St. Louis, MO (Metropolitan St. Louis Sewer District) set a record for the most expensive sewer consent decree in history at $4.7 BILLION to be spent over the next 23 years. The cause of this consent decree and the cause of most consent decrees are overflow events that allow untreated waste into the nearby lakes, streams, river, or other nature areas. There are typically two types of ...

Feb. 10, 2016

By EnTech Engineering Company

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