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THE EFFECT OF VARIOUS INTERMITTENT DRY-WET CYCLES ON NITROGEN REMOVAL CAPACITY IN BIOFILTERS SYSTEMS

Stormwater biofilter systems have the potential to remove nutrients from urban runoff. These systems operate in unique intermittent dry-wet cycles that may affect their performance. Current consensus suggests that sediment drying promotes the release of potentially significant amounts of bio-available nitrogen and phosphorus upon re-wetting. We sought to investigate the impact of drying/wetting cycles on biofilter performance. Eighteen columns were planted with Carex appressa which reached maturity after eight months. The recovery of biofilter systems was tested in a range of drying periods from one to eight weeks with and without a Submerged Anoxic Zone (SAZ) and carbon supplement in the filter media. In all experiments, moisture content, adjacent soil and ambient temperature were logged in parallel to record the drawdown profile behaviour.

 

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Testing and Refining a Policy and Methods Framework for Water Sensitive Urban Design

An important means of facilitating the uptake of Water Sensitive Urban Design, which has much in common with ‘low impact’ approaches, is to ensure that local government plans and practices are underpinned by an appropriate set of principles. A research programme in New Zealand, that is facilitating the uptake and implementation of low impact urban design policies and practices, has developed principles as a foundation for policy development in local government statutory and non-statutory plans and guidelines. Each principle is related to practical implementation methods many of which use sustainable technologies that need to be tested for their feasibility, practicality and effectiveness.

 

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MARCHING AHEAD TOWARDS WATER SUSTAINABILITY OF DELHI – A PUBLIC INTEREST LITIGATION BY TAPAS

Delhi, the capital city of India is facing today an acute water crisis reflecting the tragedy of the commons. The problem attributed is not only the shortage of water, but also the lack of proper management of the water resources. In India, the traditional water harvesting structures and the community based management practices and wisdom have been ignored apace since the onset of the British colonial rule. The British introduced a highly centralised bureaucratic top-down management system for water management based on profit making and the scientific vision of conquest of nature.

 

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Water Environment Issues of Bangkok City, Thailand:Options for Sustainable Management

Bangkok is a major city, with an area of 1570 km2 and a population of 10 million inhabitants.Situated 2 meters above sea level, and lacking proper infrastructure and planning, Bangkok faces watermanagement and water pollution problems. Presently, 91% of water demand is supplied from river water and9% from deep wells. Increased rainwater harvesting would decrease problems of land subsidence, groundwater contamination and dependence on surface water sources.

 

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The Treatment Of Rainwater For Potable Use

This paper explores the development and application of water treatment systems for rainwater. Rainwater has been traditionally used as household potable water in rural Australian and New Zealand. Individual householders have been responsible for their own water quality and this paper explores the various treatment options currently employed in rural markets to ensure potable water. Some of the potential threats to human health from rainwater and subsequenttreatment solutions are discussed.

 

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The verification of a behavioural model for simulating the hydraulic performance of rainwater harvesting systems

This paper describes the field testing of a commercially available rainwater harvesting or collection system and the verification of a model which simulates system performance. A rainwater harvesting system was installed successively into three properties and monitored for periods of twelve, six and eight months. The model verified is a behavioural model which simulates the operation of the rainwater collector’s storage tank with respect to time by routing simulated mass flows through an algorithm which describes the operation of the store. The input data in time series form is used to simulate the mass flow through the model based upon a time interval of either, a minute, hour, day or month.

 

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Urban Water Systems: Drivers of Climate Change?

Urban water systems contribute to climate change bothdirectly through the fugitive greenhouse gas (GHG) emissions associated with water storage reservoirs and wastewater treatmentprocesses, and indirectly through significant energy and materials consumption. This paper presents the findings of an investigation of the GHG emissions associated with operating a case study urban water system in Melbourne, Australia. It was revealed that the appliances associatedwith the residential end uses of water were responsible for significantly more GHG emissions than all upstream and downstream operations.

 

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Water as a Detonator of a Model of Communitarian Sustainable Development: The Case of Villa García Márquez at LaBarca, Jalisco, Mexico

The present work describes in general way a model of sustainable development applied to small communities, from considering to the water as a development axis. This proposal would be located in the community of Villa Garcia Marquez, Municipality of La Barca, Jalisco Mexico, which comprises the river basin of the Lake of Chapala, which is the most important natural water reservoir of the country and it displays remarkable environmental problems and of over-exploitation at the present time.

 

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Water crises and management through rain water in research centre of Government of India

Raja Ramanna Center For Advanced Technology is a research unit of Govt. of India, Department of Atomic Energy located in the city of Indore ( MadhyaPradesh State). The Centre is spread over an area of 700 hectares, comprising of laboratories, housing colony, gardens,open space & some surface water bodies.The water demand of Centre comprising of domestic need, scientific need & industrial need amounting to 1.50 MLD is met partly from city distribution system & partly by extracting ground water from the campus.

 

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Water Harvesting Asa Tool To Allow Environmental Recovery In A Semi-Arid Region In Brazil

A research project has been developed to evaluate the most effective microcatchment runoff farming rainwater harvesting technique to be applied in a semi-arid region in Brazil in order to increase soil humidity, minimize erosion and soil degradation as well as restore and create more options of land use for the population. The techniques tested in two 800 m2experimental plots were: Negarim; Semi-circular bunds; Contour Bunds; and Contour ridges. For each 3mx3m microcatchment one tree – guava ormango – was planted. A 200 m2area with no treatment was used as a control.

 

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