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Environmental Assessment Group Project

MINIMISATION OF THE IMPACT OF CONSTRUCTION ON THE WATER ENVIRONMENT IN URBAN AREAS
by

Emily Lachlan

on 14 December 2012

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Transcript of Environmental Assessment Group Project

Ghalia Albarazi, Afzal Ginwalla, Emily Lachlan, Charlie Lomas, Cara Mulholland MINIMISATION OF THE IMPACT OF CONSTRUCTION
ON THE WATER ENVIRONMENT IN URBAN AREAS So, what are the impacts? Shortage of water due to over consumption
Contamination of water from on-site runoff directly into water systems
Alteration of the water table The grease from washing lorries pollutes drains and water systems, requiring extensive cleaning processes to maintain drains. Design Stage Two main methods to reduce water wastage are:
fitting trigger controls
closed loop methods using a drip tray
Washing of Lorries There are several methods of detecting leaks, including:
Pressure Wave Transmission
Leak Noise Mapping
Listening survey FACT Nine litres of water can be wasted every minute from a leaking hosepipe. That means 540 litres of water wasted every hour! Every year in the UK, the construction industry is prosecuted for more than 500 water pollution incidents. FACT FACT By 2030 it is projected that 5 billion people, 60% of the world’s population, will live in urban areas Any Questions? Construction Stage Ultimately determines the characteristics of water usage during the construction stage and the rest of the structures life

“Identify, investigate and implement”

“The Designing out Waste Process” Designing water usage out of the construction phase is not always possible, so water reduction is necessary. Hose Pipes Dust Supression Leaks Ways of reducing water usage for these activites:
alternative machinery options
chemical additives
water source Hosepipes are used in construction for a number of reasons such as cleaning lorry wheels and for dust suppression and are noted as one of the key factors in the excessive use of water. Requirements are set down under Part IV of the Environment Act 1995 and the UK Air Quality Strategy Water is used for dust suppression in several tasks, including:
•Spraying water during activities such as filling skips and breakout of concrete
•Washing the vehicle wheels when leaving the site if they carry mud or debris
•Cleaning the road and footpath near the site entrance
•Possibly used with disk cutters Up to 540 litres of water can be wasted in one hour from one leaking pipe New methods of washing plant equipment:
using pressure water machines or steam cleaners to reduce water used
wash racks will reduce the impact of pollution off site
reduction of dust on site by use of boarding or paving How are water systems contaminated? Primarily from the effects of the sediment and chemical pollution produced by many construction site processes, such as excavation and concrete mixing. Sediment pollution in water courses causes increased turbidity which results in the reduced availability of sunlight for aquatic life Chemical pollution, for example from alkaline run-off due to concrete mixing, can result in changes to the pH level in water courses. Methods to Control Water Pollution Clearly marked and segregated site drainage plan
Sustainable Urban Drainage Systems (SUDS)
Carefully planned deliveries of hazardous products Detailed guides available from the Environmental Agency Changing Habits Although information is available regarding the reduction of water use and pollution, reducing wastage is largely dependent upon altering the engrained behaviour and bad habits of people Employers need to be convinced of the economic benefits gained when training staff in environmental issues. The Strategic Forum for Construction highlighted the need for water reduction in construction.

The aim was to reduce the water usage of the industry by 20% between 2008 and 2012

A baseline of 148 cubic metres of water usage per £1million of contractors output was used so that reduction targets could be set.
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