373 Works

Development of the San Diego creek natural treatment system

E. Strecker, P. Mangarella, N. Brandt, T. Hesse, K. Rathfelder & M. Leisenring
A Natural Treatment System (NTS) Master Plan that includes a watershed-wide network of constructed wetlands was evaluated for treatment effectiveness of dry weather base flows and runoff from smaller more frequent storms in a 120 square mile (311 km2) urban watershed. The goal of the \342\200\230regional retrofit\342\200\231 wetland network is to serve as an integral component in watershed-wide Best management Practices (BMPs) for compliance with pollutant loading limits (TMDLs) requiring discharge limits of sediments, nutrients,...

Practical measurement of stormwater events \342\200\223 Not a trivial task

T. Mietzel, T. Frehmann, R. Kutzner, M. Becker & W.F. Geiger
Setting up and maintaining monitoring stations is a common, but not trivial task for engineers working in the field of urban water management. Especially when faced with this task for the first time, it is difficult to find applied literature that gives answers to common problems with measuring equipment. The experience gathered during three major studies at stormwater treatment facilities, is summarized in this paper. The measuring included level measurement and flow measurement with different...

New Act Legislated in Japan for Well-balanced Hydrological System and Urban Inundation Prevention

A. Okashita & K. Ogata
This paper presents the new act legislated in Japan for well-balanced hydrological system and urban inundation prevention. The comprehensive mitigation measures for flood control have been carried out by the government for nearly 30 years. Since it does not have a legal basis to stand on, there is a limitation to implement the measures on a mandatory basis. In order to supplement this disadvantage, the new act was constituted to bridge the existing laws such...

Assessment of runoff contributing catchment areas in rainfall runoff modelling

S. Thorndahl, C. Johansen & K. Schaarup-Jensen
In numerical modelling of rainfall caused runoff in urban sewer systems an essential parameter is the hydrological reduction factor which defines the percentage of the impervious area contributing to the surface flow towards the sewer. As the hydrological processes during a rainfall are difficult to determine with significant precision the hydrological reduction factor is implemented to account all hydrological losses except the initial loss. This paper presents an inconsistency between calculations of the hydrological reduction...

The integrated unit process design approach for source control and best management practice design

M.M. Quigley, E.W. Strecker, M. Leisenring, W.C. Huber, J. Heaney, N. Weinstein, J. Sansalone & D. Bodine
Research being conducted by the authors under the National Cooperative Highway Research Program project \342\200\234Evaluation of Best Management Practices for Highway Runoff Control\342\200\235 and the Water Environment Research Foundation project \342\200\234Critical Assessment of Stormwater Treatment and Control Selection Issues\342\200\234 seeks to advance the state of the practice of stormwater design through the application of basic scientifically and technically sound engineering principals using a fundamental unit process design methodology. The research findings are being incorporated into...

Synthetic flood simulation in urban area and application of simulation model

T. Uetsuka
To mitigate flood damage in urban areas, such preventive policy as disaster prevention program and evacuation procedures should be effectively established together with upgrading and expansion of sewerage systems and improvement of rivers. However, it is difficult to effectively design these measures unless the magnitude of flood is accurately estimated in advance on the basis of the physical conditions of the targeted area and the present states of sewerage system development and river improvement. In...

Interactions within wastewater systems

J.G. Langeveld, F.H.L.R. Clemens & J.H.J.M. Van Der Graaf
Wastewater systems consist of sewer systems and wastewater treatment works. As the performance of a wastewater treatment plant is affected by the characteristics, i.e. operation and design, of the contributing sewer systems, knowledge of the interactions between sewers and wastewater treatment works is very important when trying to understand and improve wastewater systems. This paper presents an overview of the results of a 4 year research project studying the interactions within wastewater systems, focussing on...

Feasibility of roof water harveseting in a cold climate

M. Brown, N. Lo, M. B. Liebman, L. J. D. Roach & R. B. Staples
Faced with mounting security of supply issues, the water supply authority in an Australian snowplay resort is trialling roof water harvesting to reduce mains water demand. A trial was established to harvest roof water from a building in Perisher Valley, New South Wales with both a roof and ground collection system. While the trial is ongoing, results from June 2004 to January 2005 show that the ground and roof collection systems collected approximately 100kL and...

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...

Treatment of CSO water using floating plant beds

L. Buts, C. Thoeye & G. De Gueldre
A pilot installation treating a combined sewer overflow (CSO) at Bornem, Flanders is built. The construction comprises a presettler and a plug flow treatment zone with floating vegetation elements. The installation is aimed to treat efficiently a so-called two-year overflow event of 2,309 m\302\263 volume and 0.17 m\302\263/s peak flow. During the past three years a number of overflow events were registered. Initially the system performed well, with an observed COD-removal efficiency of 68% and...

Climate change and urban Drainage: Strategies

H. Van Luijtelaar, W. Stapel, M. Moens & A. Dirzwager
The national study \342\200\230Climatic Change and Urban Drainage: Quick Scan\342\200\231, in the Netherlands has shown that climatic change can have a significant effect on the functioning of urban drainage systems, Van Luijtelaar and Dirkzwager (2002).It is important to anticipate on the effects of climatic change knowing the fact that urban drainage systems are realized for a period of 40 years or more. The follow-up project called \342\200\230strategies\342\200\231 is aimed at developing \342\200\230strategies\342\200\231 to anticipate on...

Transfer of hydrophobic contaminants in urban runoff particles to benthic organisms estimated by an in vitro bioaccessibility test

F. Nakajima, K. Saito, Y. Isozaki, H. Furumai, A.M Christensen, A. Baun, A. Ledin & P.S. Mikkelsen
An in vitro bioaccessibility test was applied for assessing the transfer of polycyclic aromatic hydrocarbons (PAHs) present in road dust, into benthic organisms living in receiving water body. The road dust is supposed to be urban runoff particles under wet weather conditions. Sodium dodecyl sulfate (SDS) solution was used as a hypothetical gut fluid. Pyrene, fluoranthene and phenanthrene were the main PAH species in the SDS extractable fraction of road dust as well as the...

Pollution based real time control of a combined sewer overflow structure

K. Klepiszewski
Real time control processes in combined sewer systems are normally based on measurements of the hydraulic load conditions in the system. Dependent on the conditions, the flow in the system is adjusted to optimise the utilisation of available storage volume, to reduce discharged volume and pollutant loads into receiving water courses, and to support the operation of waste water treatment plants. Moreover, if the focal point of interest is the reduction of emitted pollutant loads...

Research and evaluation of CSO treatment technologies "SPIRIT21"

N. Horie, M. Kabata & H. Sano
Abstract The early sewer systems were built in Japan as combined sewer system (CSS), which played an important role in urban development. In recent years, pollution of receiving waters by combined sewer overflows (CSOs) conveying large oil balls was widely reported and the Ministry of Land, Infrastructure and Transport (MLIT) addressed this issue by establishing \342\200\234CSS Advisory Committee\342\200\235 with a mandate to report on CSS improvement in Japan. This study was followed by publications of...

A stormwater management information system for the catchment area of the river Emscher

M. Becker, G. Geretshauser, B. Spengler & H. Sieker
In order, in the course of remediating the Emscher river system, to reinforce the ecological potential and the municipal landscaping benefits of the new bodies of water and to limit the costs for technical stormwater management measures, great importance has been attached to coping with stormwater via surface seepage. The potential of such measures depends on many different factors of influence. Consequently it makes sense to prepare a systematic classification for checking and evaluating the...

Colloidal speciation of heavy metals in runoff and interstitial waters of a retention/infiltration pond

B. Bech\303\251t, B. Durin, M. Legret & P. Le Cloirec
The thickness of non saturated zone and physico-chemical conditions are important parameters to assess the impact of infiltration ponds on water resources with respect to heavy metals transfer. As changes in physico-chemical parameters of solutions have a strong impact on the mobility of colloidal phases in sediments and soils, the colloidal facilitated transfer of heavy metals has to be investigated. Therefore, this study focuses on the characterization of runoff, surface and interstitial waters in a...

On detecting gas pockets in pressurised wastewater mains

C. Lubbers & F. Clemens
In the Netherlands, wastewater is mostly collected in combined sewer system and transported to a WWTP through pressure mains. These pressure mains form an element of the system that did not receive much attention lately with respect to monitoring of performance and maintenance. Failure of operation is only noticed when during storm conditions the capacity of the system drops, resulting in undesirable discharge to the surface water. A recently made inventory showed that about half...

Comparative study among different methodologies to determine storm sewer inlet efficiency from test data

B. Russo & M. G\303\263mez
Storm drain inlets are used to collect urban runoff and discharge it to an underground sewer system. Inadequate attention to inlet capacity can cause undue hazard to the security of many urban activities. Several agencies and manufacturers of grates have investigated inlet grate interception capacity by hydraulic tests. Actually the reference in this field is the Hydraulic Engineering Circular No.12 published by U.S. Department of Transportation; it describes a semi-theoretical method for estimating inlet efficiency...

Using measured data for reducing precipitation distribution uncertainty

M. K. Nielsen, M. Lindstr\303\270m, K. V. Gernaey & H. Madsen
The analysis of on-line sewer system data, for example obtained from pumping stations, confirms that rainfall is far from being uniformly distributed. As a consequence, CSO estimates from deterministic sewer models using a few rain gauges as a source for input rain series data, and thus assuming a uniform distribution of the rain over a catchment, was found to be very unreliable. It is thus questionable if evaluations based on sewer models are useful when...

A Decision Support System for Urban Groundwater Resource Sustainability

S. Burn, D. DeSilva, M. Ambrose, S. Meddings, C. Diaper, R. Correll, R. Miller & L. Wolf
This paper discusses the development of a computer based software tool to generate groundwater contaminant data; that can be utilised in the sustainable management of water resources; in urban areas reliant on groundwater. The tool incorporates several models, including a model for simulation of the integrated urban water system within an urban area to estimate contaminant loads, a model that estimates the extent of leakage from sewer pipelines and two unsaturated transport models which trace...

Construction and testing of a CSO treating combined sewage to bathing water quality standards

N. K. Andersen, C. Cronqvist, P. Nielsen, L. L. Mathiasen, A. Albrechtsen & L. Bentsen
Traditional design of combined sewer overflows is known to have detrimental effects sometimes preventing surface waters from having a good status. Implementation of the Water Framework Directive highlights the need to bridge the gab between discharge permits and resulting water quality in surface waters from combined sewer discharges. New concepts must be developed and tested in full scale. The poster discusses the design, construction and testing of a treatment plant specifically intended for combined sewage....

Road runoff treatment with dual porosity filtration - 18 m3/h subsurface pilot construction in \303\230restad, Copenhagen

M.B. Jensen & L. Bisballe
In Orestad, - a 310 hectares development area in Copenhagen, storm water runoff is discharged into open canals that serve recreational purposes too. Runoff from trafficked surfaces (i.e. road runoff) has to be cleaned to obtain high quality canal water. Consequently roof runoff, which is discharged directly to the canals, and road runoff are handled in individual sewer systems. Available techniques for wastewater treatment do not fulfill the requirements in Orestad regarding effluent quality, treatment...

Water quality criteria guiding the selection and design of stormwater management measures

A. I. Lawrence & B. C. Phillips
Effective protection and management of aquatic ecosystems and other water resource values requires the establishment of clear links between catchment land use and management practice and receiving water quality. This paper demonstrates an approach to translate the receiving water protection objectives (water quality guidelines) to sustainable catchment loads of key pollutants or stressors. By comparing these values with assessments of current and projected future loads it is possible to identify the pollutant or stressor reduction...

Can we put the PUBLIC back into UTILITIES

A. Cashman
Since the later half of the 1990\342\200\231s there has been a growing concern to define the role and rights of the public vis-\303\240-vis access to and provision of water services. Implicated in this debate has been the question of the nature and extent of stakeholder involvement and public participation. The purpose of this paper is to explore the relationship between civil society and industry with respect to the management of water resources and services in...

Behavior of the activated storage-volume of flushing waves on cleaning performance

J. Dettmar & P. Staufer
Deposits build up in sewer networks during both dry-weather and storm-water events. Especially in combined sewers, the sediment materials cause various undesirable effects. Flushing devices are able to remove deposits in sewers by generating flushing waves. To optimize the flushing with so called Storage-Volume-Activated-Devices (SVAD) numerical studies were carried out. The objective was to investigate the behaviour of the activated storage-volume of flushing waves on cleaning performance.

Registration Year

  • 2011

Resource Types

  • Event