In decision-making on sewer rehabilitation risk and uncertainty are not taken into account. However, the assessments on which the decisions are based are considerably affected by uncertainties on external inputs, system behaviour and effects. In this paper, a risk-based approach is presented considering uncertainty in sewer system dimensions, natural variability in rainfall and uncertainty in t...

Unfortunately, many small communities in Illinois are served by private septic systems that are failing, resulting in serious health problems for the community. These small rural communities are often populated by residents living on low to moderate incomes, who cannot afford the cost of a conventional sewer system. As funding sources become more scarce due to government budget cuts and a shift...

Discharges of combined sewer overflows (CSOs) and stormwater are recognized as an important source of environmental contamination. However, the harsh sewer environment and particular hydraulic conditions during rain events reduce the reliability of traditional flow measurement probes. An in situ system for sewer water flow monitoring based on video images was evaluated. Algorithms to determine ...

An algorithm for online distance computation based on images taken in a sewer by a robot-inspector is presented. Modern concrete sewers are made of standard cylindrical pipes separated by manhole junction areas. Circular structures typically originate at the pipe ends and entrances as well as at the joints of the pipe sections. These structures provide regular marks on the sewer images and can ...

Newtown Creek is an industrial waterway and former tidal wetland in New York City. It is one of the most polluted water bodies in the United States and was designated as a superfund site in 2010. For over a century, organic compounds, heavy metals, and other forms of industrial pollution have disrupted the creek’s environment. The creek is also impacted by discharges from twenty combined sewer ...

Sewer degradation is mainly a stochastic process. The future condition of sewers can be predicted with models based on condition states. In The Netherlands, the ‘SPIRIT’ model is being developed which combines expert opinion and visual inspections to predict sewer degradation. The statistical method implemented in this model is based on Bayesian statistics. The likelihood function of condition ...