Sewer Performance Reporting: Factors That Influence Blockages

Marlow, David; Boulaire, Fanny; Beale, David J.; Grundy, Christine; Moglia, Magnus

doi:10.1061/(asce)is.1943-555x.0000041

Cited by 37 publications

(14 citation statements)

References 11 publications

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“…This survey also disclosed that lateral connections in foul systems are mentioned twice as often as being susceptible to tree root intrusion, compared to combined lateral connections. This is c be supported by Marlow et al (2011). Butler and Davies (2011) define fat, oil and grease (FOG) deposits as "a collective term for deposits consisting of fats, oils, greases and waxes of plant or food-based origin present in sewage".…”

Section: Tree Rootsmentioning

confidence: 99%

Statistical analysis of lateral house connection failure mechanisms

Post

Pothof

Veldhuis

et al. 2015

Urban Water Journal

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The performance of lateral house connections can have a substantial impact on the overall level of service provided by sewer systems. However, knowledge on the failure probability of these components remains scarce. This paper analyses field data to determine failure rates. A distinction is made between different mechanisms that contribute to the overall failure probability of lateral house connections. Root causes that promote the occurrence of these failure mechanisms are derived from a literature review. Results of a trend analysis shows a time constant failure rate, which exceeds blockage rates reported for main sewers. Fat, oil, and grease deposits are the dominant failure mechanism for both a specific case study in Rotterdam and the Netherlands. Literature suggests misuse and the structural condition as main root causes for this failure mechanism. The sheer number of failures associated with lateral house connections suggests that these components should be taken into account in sewer asset management. ARTICLE HISTORY

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Section: Tree Rootsmentioning

confidence: 99%

Statistical analysis of lateral house connection failure mechanisms

Post

Pothof

Veldhuis

et al. 2015

Urban Water Journal

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“…It is therefore vital to analyse each local context in order to define a strategy for reducing blockages. Moreover, according to Marlow et al (2011) andWarhurst et al (2014), it is very difficult to establish the relationship between the blockage and the blockage factors. In other words using the data from a sample section of the territory to generalize practices across the whole territory Table 2 Data required by the intervention form in order to establish hazard maps and identify major causes of flooding.…”

Section: Introductionmentioning

confidence: 99%

“…In other words using the data from a sample section of the territory to generalize practices across the whole territory Table 2 Data required by the intervention form in order to establish hazard maps and identify major causes of flooding. Halfawy and Hengmeechai (2014) Tree roots Closed circuit television (CCTV) Evrard et al (2007) Tree leaves and others solids Municipalities data collection Littlewood and Butler (2003) Deposition of solids Laboratory experiments Marlow et al (2011) Damaged pipe; foreign object; fat, oil and grease (FOG); sediment; tree roots.…”

Section: Introductionmentioning

confidence: 99%

Assessing urban potential flooding risk and identifying effective risk-reduction measures

Cherqui

Belmeziti

Granger

et al. 2015

Science of The Total Environment

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“…Purcell stated that pipe sizes smaller than 150 mm in diameter are "usually not practical due to the risk of blockage" and also notes this point in foul sewer design examples when considering the adequacy of pipe diameters [65]. Marlow et al reported that sewer diameter is one of the most significant factors in relation to sewer blockages [66]. This claim is based on analysis from two water companies in Australia.…”

Section: Sewer Blockagesmentioning

confidence: 99%

“…The analysis included approximately 13,000 km of sewer network with pipework of 300 mm diameter and under and concluded that 100 mm diameter pipes were the cause of the majority of blockages and went on to report that increased diameter pipes reduced the probability of blockages. Marlow et al [66] present data on blockage type for each of the companies as presented in Table 2 which clearly shows that fats, oils and grease (FOG) are major causes of blockages. Fenner et al [59] and Marlow et al [66] agree on a number of sewer blockage problems.…”

Section: Sewer Blockagesmentioning

confidence: 99%

Solid Transfer in Low Flow Sewers, the Distance Travelled So Far Is Not Enough

McDermott¹,

Strong²,

Griffiths³

2019

JEP

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Sewer blockages are on the increase whilst water closet (WC) flush volumes are on the decrease. Furthermore, Water UK reported figures show that the actual number of properties affected by sewer flooding is on the rise. Sewer blockages can lead to sewer flooding of homes and collapse of sewers which impact negatively on social, economic and environmental factors, and therefore, they are not sustainable. Water conservation is required due to water stress but reduced water use results in less water to waste, which in turn reduces solids' transfer in sewers. When considering reducing water usage through water conservation, these savings could be cancelled out by an increased population and the situation exacerbated by the impacts of climate change. There are issues in relation to varying design methods, a reliance on engineering judgement in sewer design, uncertainty relating to future water stress, and a lack of cross disciplinary design decision-making. Public health engineering solutions are needed to reduce the number of sewer blockages and the environmental impact of sewer flooding. This paper examines the fundamental research that have been carried out in the area of "solid transfer in sewers" resulting from "less water to waste" since the mid-20th Century. Contrary to existing literature, this paper identifies that, now more than ever, this type of research is needed to deal with the increased need for water conservation. To judge that solid transfer research is complete can be compared to supporting a statement that "water conservation is complete".

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Sewer Performance Reporting: Factors That Influence Blockages

Cited by 37 publications

References 11 publications

Statistical analysis of lateral house connection failure mechanisms

Statistical analysis of lateral house connection failure mechanisms

Assessing urban potential flooding risk and identifying effective risk-reduction measures

Solid Transfer in Low Flow Sewers, the Distance Travelled So Far Is Not Enough

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