420 Works

Filtration for metals removal from stormwater

S. Clark, P. Johnson, R. Pitt, S. Gill & M. Pratap
Filtration as a method of stormwater treatment was investigated in a 3-year study. Equilibrium and kinetic studies of metals\342\200\231 capture were performed initially on twelve media. The three best performing media: peat-sand mix, compost, and zeolite were then selected for in-depth study. Upflow filters did not clog as easily as downflow, and longer-term performance was better in the upflow column. Metals were retained on the filters during anaerobiosis. Metal retention by the filters was not...

Relative comparison of different types of uncertainties in sewer water quality modelling

P. Willems
Quantifiable sources of uncertainty have been identified for a case-study of integrated modelling of a sewer system with a more downstream wastewater treatment plant and storage sedimentation tank. The different sources were classified in model input and model-structure uncertainties. They were quantified and propagated towards the uncertainty in the prediction of sewer emissions (flow, and physico-chemical water quality concentrations and loads). Based on variance decomposition, the total prediction uncertainty was splitted into the contributions of...

Flood frequency estimation for an urban catchment using continuous simulation

G. A. Jenkins & D.B. Newton
Urban development of rural areas generally has a significant impact upon the hydrologic and hydraulic regime of nearby creeks and rivers. The removal of vegetation and replacement with buildings and paved surfaces also significantly affects the water quality and morphological characteristics of the receiving waters. An understanding of the hydrologic impacts of urbanization is essential for the assessment of the ecosystem health of urban waterways, as well as for the prediction of flooding. This paper...

A Proposal of Combined Separate Sewer System (CSSS)

M. Zaizen & Y. Matsumoto
With respect to the systems of urban drainage, two main systems have been adopted so far, i.e., combined sewer system (CSS) and separate sewer system (SSS). Each of them has some merits and demerits respectively. Regarding the environmental demerits, the CSS has a problem of combined sewer overflow (CSO), and the SSS has a problem of diffuse pollution. Then, what system is more appropriate for urban areas? This paper describes a new concept of urban...

Artificial intelligence techniques for short-term rainfall forecast

I.J. Pelczer & H.L. Cisneros Iturbe
The purpose of the present study is to evaluate the appropriateness of the use of artificial intelligence techniques for short term rainfall forecast in a large urban basin. The work represents the first step of a year-term enterprise that has as final purposes the spatial-temporal characterization and forecast of rainfall events in Mexico City based on rain-gauge data only and modeling the rainfall-runoff relation for the same region. In a first approach we analyzed the...

Sewer rehabilitation planning \342\200\223 priority and cost planning using GIS

R. Burkhard & S. G. Lakehal
Rehabilitation priority and cost planning are an important and integral part of urban drainage master planning in Switzerland. Although Entsorgung + Recycling Z\303\274rich (ERZ), the sewer-age utility of the city of Z\303\274rich, has considerable financial means available for the rehabilita-tion of its sewers, it has so far not established a continuous leading role in triggering rehabili-tation projects among the city\342\200\231s utilities departments, which results in a suboptimal qualitative improvement of the sewer network. This was...

Reduction of pollution load from street-runoff by an inlet-filtration-system filled with adsorptive material

H. Sommer & H. Sieker
Pollution of surface waters by runoff from sealed areas is coming more into focus. As shown by several national and international studies, this part of wastewater cannot be neglegted. There are different strategies to reduce emission from urban runoff. One is to reduce the pollution load to rivers and lakes by centralised retention, purification tanks and centralised constructed wetlands. An alternative strategy is source control. The presented solution in this paper concerns the thousands of...

Comparison of infiltration flows at three types of infiltration facilities in serial rainfall events with different characteristics

M. Murakami, H. Furumai, F. Nakajima, H.K.P.K. Jinadasa & R.K. Aryal
Infiltration facilities function for the groundwater recharge, retention of non-point pollutants as well as the reduction of stormwater peak flow in urban areas. Although there have been several simulation researches focusing on reduction of stormwater peak flow by introduced infiltration facilities, limited simulations have been done to estimate the water balance and discuss the characteristics of infiltration flows. In this study, runoff quantity simulation was carried out to compare the contribution of infiltration volume for...

The Portuguese experience on the regulation of the water and solid wastes sectors - Quality of service assessment

J. Melo Baptista, H. Alegre, R. Matos & E. Beja Neves
The main objectives of this paper are to provide an overview of the Portuguese Regulator\342\200\231s (IRAR) main strategic guidelines and to describe the outcome of a project carried out, in association with LNEC, aimed at defining the performance indicators (PI) systems to be used as basis for comparison of the operators\342\200\231 performance. Three groups of PI were defined, related to: 1) protection of the user interests; 2) sustainability of the operator; and 3) environmental sustainability....

Life cycle optimization for highway BMPs

J. G. Lee, J. P. Heaney, D. N. Rapp & C. A. Pack
Highway runoff can cause a number of water quantity and quality problems. Stormwater management systems for highways have been developed based on a fast drainage for large storm situations. Nonpoint source pollution from highway runoff is a growing water quality concern. Stormwater quality control needs to be integrated into highway drainage design and operation to reduce the stormwater impacts on the receiving water. A continuous simulation/optimization model for analyzing integrated highway BMPs is presented. This...

The DTU Strategy Implementer Workbook

Josef Oehmen, Diana Velasco, Line Christiane Lund Strøm & Pelle Lundquist Willumsen
The Strategy Implementer - a workbook for mastering people and uncertainty in implementing strategy initiatives.

The hydraulic capacity of sewer system scanned by CCTV inspection

J. Pollert Jun, R. Ugarelli & S. Saegrov
Sewer and wastewater systems suffer from insufficient capacity, construction flaws and pipe deterioration. This paper presents the results of a research developed inside the CARE-S project focused on sewer and storm water networks management.. Hydraulic simulations are usually done running commercial models that apply, as input, default values of parameters that strongly influence results. Using CCTV inspections data to cataloguefailures affecting pipes, a 3D model was used to evaluate their hydraulic consequences. The translation of...

New guidelines for planning of real time control for urban drainage systems

M. Sch\303\274tze, U. Haas, M. Scheer & W. Schilling
Recently, the Working Group \342\200\234Real time control\342\200\235 of the German Association for Water, Wastewater and Waste (DWA, formerly: ATV-DVWK) has prepared a guideline document on planning of real time control (RTC) systems for urban drainage catchments. At present, the document is in its consultation phase, its publication as a DWA guideline document is envisaged (in German language) in 2005. This paper summarises its main issues, in order to make the guidelines available to an international...

Cascaded numerical models for offshore floating wind turbines

Antonio Manuel Pegalajar Jurado

Interactive implementation

G. D. Geldof
In the last decades it has become clear that improving the quality of the urban environment asks for an integrated approach and stormwater source control. However, practice shows stubborn behaviour. Water managers did start to produce integrated water plans, but only a few measures in these plans are really implemented. This paper uses complexity science building bricks to handle above mentioned problem. Instead of the traditional serial approach a parallel approach is introduced. This is...

Assessing the impact of infiltration and exfiltration in sewer systems using performance indicators: case studies of the APUSS project

M.A. Cardoso, V. Prigiobbe, M. Giulianelli, E. Baer, J. De B\303\251n\303\251dittis & S.T. Coelho
The structural quality and functional efficiency of sewer systems are key parameters to guarantee the transfer of domestic, commercial and industrial wastewater to treatment plants without infiltration nor exfiltration. Infiltration of groundwater is particularly detrimental to treatment plant efficiency, while exfiltration of wastewater can lead to groundwater contamination. The APUSS project associating universities, SMEs and municipalities in 7 European countries, developed new methods and techniques to assess and quantify infiltration and exfiltration (I/E) in sewer...

IBOS Regenwater: the Dutch interactive decision support tool for sustainable storm water management

J. Kluck, P.G.G. Ganzevles, M.M. Van Wijk & A.S. Beenen
In order to facilitate urban water managers developing alternative ways of dealing with storm water, an interactive decision support system has been developed. It is called \342\200\234IBOS Regenwater\342\200\235 (Dutch abbreviation for: Interactive Decision Support System for Storm Water) and can be used on the Internet: http://www.ibosregenwater.nl. The decision support system focuses on local projects. It results in a well argued policy line for storm water management that is adapted to the specific local conditions. The...

Urban run-off volumes dependency on rainfall measurement method - Scaling properties of precipitation within a 2x2 km radar pixel

L. Pedersen, N. E. Jensen, M. R. Rasmussen & M. G. Nicolajsen
Urban run-off is characterized with fast response since the large surface run-off in the catchments responds immediately to variations in the rainfall. Modeling such type of catchments is most often done with the input from very few rain gauges, but the large variation in rainfall over small areas suggests that rainfall needs to be measured with a much higher spatial resolution (Jensen and Pedersen, 2004). This paper evaluates the impact of using high-resolution rainfall information...

Characteristics of benzo(a)pyrene in highway runoff pollution

Y. Wada, T. Ozaki & M. Muraoka
The influence on receiving water of highway runoff is considered to be serious in Japan. On the road surface, tire wear, automobile exhaust emissions, floating in the atmosphere and so on, accumulate on the road surface and in its lateral ditches. This polluted matter is discharged by stormwater into the receiving water. These accumulated pollution loads contain harmful materials to both the human body and the ecosystem. In this study, the amount of accumulated pollutants...

Stormwater inflow prediction using radar rainfall data compressed by principal component analysis

K. Katayama, K. Kimijima, O. Yamanaka, A. Nagaiwa & Y. Ono
This paper proposes a method of stormwater inflow prediction using radar rainfall data as the input of the prediction model constructed by system identification. The aim of the proposal is to construct a compact system by reducing the dimension of the input data. In this paper, Principal Component Analysis (PCA), which is widely used as a statistical method for data analysis and compression, is applied to preprocessing radar rainfall data. Then we evaluate the proposed...

Flood control measures in Kuala Lumpur city centre

W. S. Wong, M. N. Zulkifli, K. W. Loke & N. M. K. Nik Hassan
ABSTRACT Due to rapid urbanisation in the Kuala Lumpur city, flooding has become very frequent and severe in the recent years that have caused great economical losses and disruption to social activities. Immediate flood control measures have to be implemented and because of the land constraint, the proposed measures have to be innovative to achieve the required protection level with minimum disturbance to the present conditions. The project work involved a detailed review of previous...

The Flemish CSO monitoring network revisited

R. Bouteligier, G. Vaes & J. Berlamont
In 1998 a combined sewer overflow (CSO) monitoring network was established by the Water division of the Administration of Environment, Nature, Land and Water Management AMINAL (Ministry of Flanders, Department of Environment & Infrastructure). At the end of the measuring campaign 19 CSOs were being monitored. As a result data for five consecutive years are available at a number of CSO locations. This paper presents the results of a research project carried out by the...

CSO detention tanks in Barcelona: Real time control design and operation

I. Escaler, A. Gil, R. Guasch & J. M. Verdejo
The environmental concern in the sewerage field has led Barcelona to build and operate its first CSO (combined sewer overflow) detention tank. It has been built in the zone of Forum de les Cultures 2004 and its main objective is the environmental protection of the new area seafront. This tank will be part of the Remote Control System of Barcelona\342\200\231s sewer network so its regulation strategy has been designed. This paper presents the design process...

Capturing extreme rainfall events in Kerayong catchment

M.N.M. Desa, M. Akhmal H. & A.W. Kamsiah
ABSTRACT This paper will discuss the extreme event of recorded rainfall in the Kerayong river catchment which has been categorised as sub-urban catchment with rapid growth rate due to urbanisation process. From the two years data collected in the catchment, the analysis will determine the number of storm events, distribution of rainfall in the catchment and the highest rainfall at 1,3 and 5-minutes interval for better understanding and input to flood forecasting and flood mitigation...

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