Showing results for: drainage modeling Articles

Characterization of the hydraulic performance of a gully under drainage conditions

During rainfall events with low return periods (1–20 years) the drainage system can provide some degree of protection to urban areas. The system design is based not only on good hydraulic performance of the surface and the sewer network but also on their linking elements. Although the linking elements are of utmost importance as they allow the exchange of flow between the surface and the ...

Jun. 25, 2014

By IWA Publishing
Urban drainage models – simplifying uncertainty analysis for practitioners

There is increasing awareness about uncertainties in the modelling of urban drainage systems and, as such, many new methods for uncertainty analyses have been developed. Despite this, all available methods have limitations which restrict their widespread application among practitioners. Here, a modified Monte-Carlo based method is presented that reduces the subjectivity inherent in typical ...

Nov. 29, 2013

By IWA Publishing
An integrated cellular automata evolutionary-based approach for evaluating future scenarios and the expansion of urban drainage networks

The paper describes and demonstrates an integrated cellular automata evolutionary-based approach for evaluating future scenarios including the expansion of urban drainage networks. The approach can be used to derive a drainage network layout based on future land use scenarios. Two techniques are used to derive the layout of the system: one using agent-based modelling and the other using similar ...

Mar. 26, 2014

By IWA Publishing
Adaptation of sewer networks using integrated rehabilitation management

The urban water structure is aging and in need of rehabilitation. Further, the need to address future challenges (climate change, urban development) also arise lines. This study investigates if it is possible to combine rehabilitation and adaptation measures. To do so, we combined an urban development model, an urban drainage model and a rehabilitation model. A case study of a medium-sized ...

Dec. 15, 2014

By IWA Publishing
Simplifying impact of urban development on sewer systems

Linking urban development and urban drainage models is a more and more popular approach when impacts of pavement of urban areas on sewer system performance are evaluated. As such an approach is a difficult task, this is not a feasible procedure for everyday engineering practice. We propose an alternative method, based on a developed simple near-quadratic relationship, which directly translates ...

Dec. 15, 2014

By IWA Publishing
Flood control in an urban drainage system using a linear controller

Effective management of floods in densely populated urban areas poses a great challenge. Computer modeling plays an important role in appropriate management of urban drainage systems. In this study an effort has been made to develop an efficient urban drainage model in which hydraulic results obtained from the developed SWMM model have been linked with a Proportional Integral Derivative (PID) ...

Jan. 1, 2017

By IWA Publishing
Analysing urban floods and combined sewer overflows in a changing climate

Climate change is expected to lead to an increased frequency and intensity of extreme precipitation events. For urban drainage, the primary adverse effects are more frequent and severe sewer overloading and flooding in urban areas, and higher discharges through combined sewer overflows (CSO). For assessing the possible effects of climate change, urban drainage models are run with ...

Dec. 1, 2011

By IWA Publishing
An appraisal of the qualifying role of hydraulic heritage systems: a case study of Qanats in central Iran

Hydraulic heritage systems, both underground and exposed, have been known to be sustainable for millennia. Persian and also Roman aqueducts are examples of such hydrosystems. Their value is often overlooked but they have undeniable advantages: they have functional interconnectedness with their surrounding society and ecology, which sometimes leads to revitalization plans. By using the notion ...

Dec. 15, 2014

By IWA Publishing
Effects of a 20 year rain event: a quantitative microbial risk assessment of a case of contaminated bathing water in Copenhagen, Denmark

Quantitative microbial risk assessments (QMRAs) often lack data on water quality leading to great uncertainty in the QMRA because of the many assumptions. The quantity of waste water contamination was estimated and included in a QMRA on an extreme rain event leading to combined sewer overflow (CSO) to bathing water where an ironman competition later took place. Two dynamic models, (1) a ...

Dec. 11, 2013

By IWA Publishing
Assessing the potential of using telecommunication microwave links in urban drainage modelling

The ability to predict the runoff response of an urban catchment to rainfall is crucial for managing drainage systems effectively and controlling discharges from urban areas. In this paper we assess the potential of commercial microwave links (MWL) to capture the spatio-temporal rainfall dynamics and thus improve urban rainfall-runoff modelling. Specifically, we perform numerical experiments ...

Nov. 1, 2013

By IWA Publishing
Real-time forecasting urban drainage models: full or simplified networks?

Lead time between rainfall prediction results and flood prediction results obtained by hydraulic simulations is one of the crucial factors in the implementation of real-time flood forecasting systems. Therefore, hydraulic simulation times must be as short as possible, with sufficient spatial and temporal flood distribution modelling accuracy. One of the ways to reduce the time required to run ...

Nov. 13, 2010

By IWA Publishing
Receiving water quality assessment: comparison between simplified and detailed integrated urban modelling approaches

Urban water quality management often requires use of numerical models allowing the evaluation of the cause–effect relationship between the input(s) (i.e. rainfall, pollutant concentrations on catchment surface and in sewer system) and the resulting water quality response. The conventional approach to the system (i.e. sewer system, wastewater treatment plant and receiving water body), considering ...

Nov. 1, 2010

By IWA Publishing
Soil Column Drainage Modelling Using a Geotechnical Centrifuge

Equipment has been developed to facilitate supplying a soil column with water or draining a soil column under conditions of constant head while the soil column is under centrifugal forces in a geotechnical centrifuge. Accurate monitoring of the water mass transfer is also facilitated by the equipment. At the completion of a modelling sequence, the soil column may be partitioned for moisture ...

Sep. 1, 1991

By ASTM International
Impact of rainfall temporal resolution on urban water quality modelling performance and uncertainties

A key control on the response of an urban drainage model is how well the observed rainfall records represent the real rainfall variability. Particularly in urban catchments with fast response flow regimes, the selection of temporal resolution in rainfall data collection is critical. Furthermore, the impact of the rainfall variability on the model response is amplified for water quality ...

Jul. 4, 2013

By IWA Publishing
Short-term forecasting of urban storm water runoff in real-time using extrapolated radar rainfall data

Model-based short-term forecasting of urban storm water runoff can be applied in real-time control of drainage systems in order to optimize system capacity during rain and minimize combined sewer overflows, improve wastewater treatment or activate alarms if local flooding is impending. A novel online system, which forecasts flows and water levels in real-time with inputs from extrapolated radar ...

Jun. 25, 2013

By IWA Publishing
Pore–scale analysis of the effects of contact angle hysteresis on blob mobilisation in a pore doublet

The mobilisation of residual oil blobs in porous media is hampered by the so–called Jamin effect. We studied the Jamin effect experimentally in a pore doublet model and explain it through contact angle hysteresis. We measured the contact angles (in 2D and 3D) and the mean curvatures of a blob trapped in the pore doublet model. Due to gravity effects and hysteresis, the contact angles were ...

Apr. 4, 2012

By Inderscience Publishers
Uncertainty in urban flood damage assessment due to urban drainage modelling and depth-damage curve estimation

Due to the increased occurrence of flooding events in urban areas, many procedures for flood damage quantification have been defined in recent decades. The lack of large databases in most cases is overcome by combining the output of urban drainage models and damage curves linking flooding to expected damage. The application of advanced hydraulic models as diagnostic, design and decision-making ...

Jun. 1, 2010

By IWA Publishing
Real-time forecasting urban drainage models: full or simplified networks?

Lead time between rainfall prediction results and flood prediction results obtained by hydraulic simulations is one of the crucial factors in the implementation of real-time flood forecasting systems. Therefore, hydraulic simulation times must be as short as possible, with sufficient spatial and temporal flood distribution modelling accuracy. One of the ways to reduce the time required to run ...

Oct. 1, 2010

By IWA Publishing
Real-time urban flood forecasting and modelling – a state of the art

All urban drainage networks are designed to manage a maximum rainfall. This situation implies an accepted flood risk for any greater rainfall event. This risk is often underestimated as factors such as city growth and climate change are ignored. But even major structural changes cannot guarantee that urban drainage networks would cope with all future rain events. Thus, being able to forecast ...

Jun. 25, 2013

By IWA Publishing
Estimation of combined sewer overflow discharge: a software sensor approach based on local water level measurements

Combined sewer overflow (CSO) structures are constructed to effectively discharge excess water during heavy rainfall, to protect the urban drainage system from hydraulic overload. Consequently, most CSO structures are not constructed according to basic hydraulic principles for ideal measurement weirs. It can, therefore, be a challenge to quantify the discharges from CSOs. Quantification of ...

Sep. 30, 2016

By IWA Publishing

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