2,430 Works

Laboratory experiments for predicting clogging in stormwater infiltration systems

N.R. Siriwardene, B. E. Hatt, A. Deletic & T. D. Fletcher
Infiltration systems divert urban stormwater away from the surface runoff path, acting to temporarily store and then infiltrate it into the surrounding soils. However, these systems have a very high failure rate due to clogging. Research is being conducted at Monash University to develop a fundamental understanding of clogging processes and to develop a new clogging prediction method for stormwater infiltration systems. This paper presents the method and results of the preliminary experiments carried out...

Modelling constructed wetlands for CSO treatment in long-term pollution load simulation

I. Kaufmann & T. G. Schmitt
In combined sewer systems an enhanced treatment of combined sewer overflow (CSO) is required, when augmented water quality requirements are demanded or conventional CSO treatment does not meet environmental quality standards. Constructed wetlands (CWs) have become the most common method to provide enhanced treatment of CSO in Germany. As simulation models are an important tool in planning urban drainage systems, enhanced treatment devices need to be implemented in the computing procedures. A new module for...

Full scale testing of enhanced local treatment of CSOs enabling a cost-efficient implementation of the EU Water Framework Directive

N.K. Andersen, P. Hallager, A. Laustsen, J.B. Nielsen, N.T.D Kristensen, P. Nordemann, W. Rauch, G.G. Nielsen & K. Arnbjerg-Nielsen
There is a definite need for full-scale applications on which to judge the efficiency of novel processes for local treatment of combined sewer overflows (CSO). Three full-scale facilities are constructed to study typical types of CSO discharges: 1) Discharges from small upstream catchments to small watercourses, 2) Discharges from larger catchments to larger surface water, and 3) Discharges to marine coastal waters where bathing is permitted. The paper outlines the proposed technologies and discusses the...

Significant climate change of extreme rainfall in Denmark

K. Arnbjerg-Nielsen
During the last years practitioners of urban drainage has complained that they felt that surcharging occurred more frequently. Therefore a study was initiated focussing on the variations in extreme rainfall during the last two decades. In Denmark a total of 41 rain gauges with a high resolution in time and volume have an observation period close to 20 years. The rainfall observed at these gauges was selected for this study. Three variables were analyzed for...

Full scale testing of enhanced local treatment of CSOs enabling a cost-efficient implementation of the EU Water Framework Directive

N.K. Andersen, P. Hallager, A. Laustsen, J.B. Nielsen, N.T.D Kristensen, P. Nordemann, W. Rauch, G.G. Nielsen & K. Arnbjerg-Nielsen
There is a definite need for full-scale applications on which to judge the efficiency of novel processes for local treatment of combined sewer overflows (CSO). Three full-scale facilities are constructed to study typical types of CSO discharges: 1) Discharges from small upstream catchments to small watercourses, 2) Discharges from larger catchments to larger surface water, and 3) Discharges to marine coastal waters where bathing is permitted. The paper outlines the proposed technologies and discusses the...

Significant climate change of extreme rainfall in Denmark

K. Arnbjerg-Nielsen
During the last years practitioners of urban drainage has complained that they felt that surcharging occurred more frequently. Therefore a study was initiated focussing on the variations in extreme rainfall during the last two decades. In Denmark a total of 41 rain gauges with a high resolution in time and volume have an observation period close to 20 years. The rainfall observed at these gauges was selected for this study. Three variables were analyzed for...

Development and investigation of a pollution control pit for treatment of stormwater from metal roofs and traffic areas

C. Dierkes, P. G\303\266bel, M. Lohmann & W.G. Coldewey
Source control by on-site retention and infiltration of stormwater is a sustainable and proven alternative to classical drainage methods. Unfortunately sedimentary particles and pollutants from drained surfaces cause clogging and endanger soil and groundwater during long-term operation of infiltration devices. German water authorities recommend the use of infiltration devices such as swales or swale-trench-systems. Direct infiltration by underground facilities such as pipes, trenches or sinks without pre-treatment of runoff is generally not permitted. Problems occur...

Comparison of numerical and experimental simulations of a flood in a dense urban area

E. Mignot, A. Paquier & T. Ishigaki
Although various numerical methods were used to simulate real floods occurring in cities, the validation of the models was never accurate because of the lack of data about location and event description and about observation for validation. In order to check the capacities of our 2-dimensional shallow water equations model to simulate an urban flood, we then decided to simulate numerically an experimental event with well known characteristics and accurate flow measurements. The physical model...

Radical and gradual environmental innovations in urban water management - could they be friends?

D.L.T. Hegger, B.J.M. Van Vliet & A.R. Mels
This paper deals with the socio-cultural aspects of environmental innovations in urban water management, comparing two categories of cases: disconnection of rainwater from the sewage system and Ecological Sanitation. The former is a gradual innovation that has become official policy in The Netherlands. The latter is a radical innovation that has been implemented in several demonstration projects in Western Europe. After studying the cases, it can be concluded that gradual innovations such as disconnection of...

Simulations of flash floods in Marseille and Bordeaux with a two-dimensional runoff model

F. Pons, B. Zhang, P. Sergent & D. Felts
Recent tragedies of flooding in urban areas like Bordeaux (1982), N\303\256mes (1988) or Marseille (2000) have led stakeholders and technicians to lean on this issue. Sewage systems for rainfalls are generally designed for events with a return period of ten years whereas more severe events lead to runoff on the streets and unfortunately to damages of goods and sometimes human casualties. This work aims at improving surface flow models in urban area through a project...

Co-operation of inhabitants and public authorities

E. Jacobs
In the Netherlands as a low-lying country, high groundwater tables cause problems in some houses. The actual cause of these problems is different in different cases, but a problem is always that the responsibilities are complex. The official policy is that not only there is a responsibility for the public bodies; also the owners of the houses themselves have a responsibility. From the point of view of the inhabitants however, high groundwater tables are something...

Simulations of flash floods in Marseille and Bordeaux with a two-dimensional runoff model

F. Pons, B. Zhang, P. Sergent & D. Felts
Recent tragedies of flooding in urban areas like Bordeaux (1982), N\303\256mes (1988) or Marseille (2000) have led stakeholders and technicians to lean on this issue. Sewage systems for rainfalls are generally designed for events with a return period of ten years whereas more severe events lead to runoff on the streets and unfortunately to damages of goods and sometimes human casualties. This work aims at improving surface flow models in urban area through a project...

Co-operation of inhabitants and public authorities

E. Jacobs
In the Netherlands as a low-lying country, high groundwater tables cause problems in some houses. The actual cause of these problems is different in different cases, but a problem is always that the responsibilities are complex. The official policy is that not only there is a responsibility for the public bodies; also the owners of the houses themselves have a responsibility. From the point of view of the inhabitants however, high groundwater tables are something...

Pollution retention of different permeable pavements with reservoir structure at high hydraulic loads

C. Dierkes, M. Lohmann, M. Becker & U. Raasch
Permeable pavements for sustainable stormwater management and source control are have been furthered and investigated in Germany for many years. In particular the runoff from streets and parking areas with low traffic densities can be permitted to infiltrate with the aid of concrete pavers with wide joints. But runoff from traffic areas contains pollutants such as heavy metals and hydrocarbons that can endanger the soil and groundwater. Furthermore solids in stormwater runoff bring about clogging....

Performance indicators for waste water treatment and urban drainage system

G. Vaes, P. Swartenbroekx, F. Provost, S. Van Den Broeck & L. Bourgoing
In Flanders the practical implementation of investments in main sewers and treatment plants and the exploitation of it, is carried out by Aquafin. The investments are commissioned by the Flemish government, who wants to introduce a result commitment that is function of the performance of the management of the waste water transport and treatment system. To realise this, a framework of performance indicators was worked out and tested. For the typical Flemish waste water system...

The perception of flood risk and water nuisance

T. Terpstra, J. M. Gutteling, G.D. Geldof & B. Kappe
In this paper we applied the psychometric paradigm to validate a questionnaire that assesses the risk perception characteristics of flooding and water nuisance. The state-trait anxiety inventory was used as a bench mark to determine whether perceptions are related to anxiety characteristics. A focus group was used to further validate the questionnaire. Factor analyses of 49 questionnaires identified eight flooding factors (explained variance: 74%) and three water nuisance factors (explained variance: 62%). Internal consistencies of...

The perception of flood risk and water nuisance

T. Terpstra, J. M. Gutteling, G.D. Geldof & B. Kappe
In this paper we applied the psychometric paradigm to validate a questionnaire that assesses the risk perception characteristics of flooding and water nuisance. The state-trait anxiety inventory was used as a bench mark to determine whether perceptions are related to anxiety characteristics. A focus group was used to further validate the questionnaire. Factor analyses of 49 questionnaires identified eight flooding factors (explained variance: 74%) and three water nuisance factors (explained variance: 62%). Internal consistencies of...

Daily patterns of micro-organisms in the foul sewer system of Doncaster, United Kingdom

J. Rueedi, A.A. Cronin & B.L. Morris
Much is known about short-term changes in sewage volumes because they are often measured in pipeline design studies. Usually, sewage volumes peak in the morning and again in the evening, and leakage rates are expected to change correspondingly. To assess the contaminant load leaking into the subsurface, however, it is important to know the daily evolution of contaminant concentrations. These data are scarce, particularly for pathogenic micro-organisms. This study describes results of raw sewage sampling...

Daily patterns of micro-organisms in the foul sewer system of Doncaster, United Kingdom

J. Rueedi, A.A. Cronin & B.L. Morris
Much is known about short-term changes in sewage volumes because they are often measured in pipeline design studies. Usually, sewage volumes peak in the morning and again in the evening, and leakage rates are expected to change correspondingly. To assess the contaminant load leaking into the subsurface, however, it is important to know the daily evolution of contaminant concentrations. These data are scarce, particularly for pathogenic micro-organisms. This study describes results of raw sewage sampling...

Dynamic least-cost optimisation of wastewater systems remedial works requirements

Z. Vojinovic, D. Solomatine & R. K. Price
In recent years there has been increasing concern for wastewater system failure and identification of optimal set of remedial works requirements. So far, several methodologies have been developed and applied in asset management activities by various water companies worldwide but often with limited success. In order to fill the gap, there are several research projects that have been undertaken in exploring various algorithms to optimise remedial works requirements but mostly for drinking water supply systems...

Use of 3D modeling to instrument CSOs

G. Lipeme Kouyi, J. Vazquez, Y. Simonin, M. Zug & J.B. Poulet
The assessment of the flows and the pollutant load discharged into the natural environment requires the installation of an adequate instrumentation. The knowledge of the hydraulic operation of the Combined Sewer Overflows (CSOs) is thus essential. We use 3D modeling (FLUENT) in order to understand the hydrodynamics in these works. Initially, the numerical results arising from 3D modeling of the flows in side storm overflows were validated in experiments in laboratory. In the second time,...

How to divide hydrographs into the original sources of runoff

K. Arnbjerg-Nielsen, A. B. Hasling, N.B. Johansen, C. R. Petersen, H. S. Andersen, M. Grum, F. Agerskov, J. Thyme, S. Nielsen, T. H. Nielsen, H. M. Petersen, J. N\303\270rremark & B. N. Jacobsen
ABSTRACT Today, many sewer systems are monitored closely with on-line data with high resolution in time. This information is used to plan and optimize the management of the system by checking pump performance, counting the number and size of combined sewer overflows etcetera. Sometimes the data is also used to calibrate hydrodynamic models of the sewer system. However, the information can also be used to study long-term changes in the performance of the sewer system...

The influence of extensive vegetated roofs on runoff water pollution loads

J. Czemiel Berndtsson & L. Bengtsson
The influence of extensive sedum-moss vegetated roofs on runoff water pollution loads was studied for four full scale installations located in southern Sweden. The aim of the study was to ascertain whether the vegetated roof behaves as a sink or a source of pollutants on annual basis. The pollution loads from vegetated roofs was also compared with the pollution loads from two non-vegetated roofs located in the study areas. The annual pollution loads were calculated...

Dynamic least-cost optimisation of wastewater systems remedial works requirements

Z. Vojinovic, D. Solomatine & R. K. Price
In recent years there has been increasing concern for wastewater system failure and identification of optimal set of remedial works requirements. So far, several methodologies have been developed and applied in asset management activities by various water companies worldwide but often with limited success. In order to fill the gap, there are several research projects that have been undertaken in exploring various algorithms to optimise remedial works requirements but mostly for drinking water supply systems...

Optimization of sediment trap configuration using CFD modelling for Indian drainage systems

K. Gupta, P. Mehta, T. Thinglas, S.J. Tait & V. Stovin
The flow capacity of urban stormwater drainage channels in major cities of India are gradually being reduced due to increased quantities of solid waste being introduced into these systems. During low flows, the solid waste forms deposits within these open drainage channels. These must be regularly cleaned to ensure that the drains function at an optimal hydraulic capacity in order to limit overflows. This places a significant burden on the operators of these systems. The...

Registration Year

  • 2010
    1
  • 2011
    2,020
  • 2013
    1
  • 2014
    259
  • 2015
    4
  • 2016
    2
  • 2017
    14
  • 2018
    40
  • 2019
    89

Resource Types

  • Text
    420
  • Event
    373
  • Dataset
    39
  • Collection
    26
  • Other
    23
  • Audiovisual
    10
  • Software
    10