water leakage

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water leakage

Mesaj  pierderiapa la data de Mier Iun 13, 2012 2:34 am

http://www.guardian.co.uk/news/datablog/2012/may/08/water-companies-leaks-target-drought?utm_source=twitterfeed&utm_medium=twitter&goback=%2Egde_2507272_member_123768238



Water leakages: which company is the worst?
3.36bn litres of water a day are currently being leaked by our water companies. See how yours is tackling this issue
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Despite millions facing hosepipe bans, over half of water companies aren't required to reduce their leakages. Photograph: Frank Baron for the Guardian
Over three billion litres of water leaks from our water companies every day according to data obtained by the Guardian showing that over half of water companies are not required to reduce their leakages before 2015.

Despite the wettest April on record, millions of people across the UK are facing a hosepipe ban for the rest of the year and drought has been declared in southern and central England. Damian Carrington writes:

Ofwat and the water industry highlight a one-third reduction in leakages since privatisation, but over the past 12 years, year-on-year leakages have increased as often as they have fallen, suggesting no long-term downward trend.

The average annual customer bill for water has risen by £64 since 2001 and is now £376, while the companies collectively made £2bn in pre-tax profits and paid £1.5bn in dividends to shareholders in 2010-11.


The data from regulator Ofwat shows some suprising results by water company - more than half of water companies won't have to reduce their leakages at all before 2015. The chart below shows how estimated water leakages have changed over time.


Here are some of the key points from the figures:

• From 1998-2011 there was only a 5% cut in leaks by the 21 water companies serving England and Wales
• 1.5% cut in leaks - the target for the next 4 years (to 2014-15)
• 10% - the target for the next 25 years according to Ofwat
• 11 of the 21 water companies have zero % leak targets for years up to 2014-15
• Southern water, which missed its leak target (again) in 2010-11 by 16%, is allowed to *increase* leakage by 6% by 2014-15
• 3.36bn litres of water a day are currently being leaked, and aiming for 3.24bn by 2014-15 - roughly 25% of all water
• Average bills have risen by £64 in last decade to £376 a year

The tables below show company targets up to 2014-15. Data showing figures for company estimates of total leakage (MI/d) from 1998-99 to 2010-11 can be found in the spreadsheet.What can you do with the data?

Data summary
Company estimates of total leakage - megalitres per day (Ml/d)

Click heading to sort table. Download this data
Company 2010-11 (perfor - mance) 2010-11 2011-12 2012-13 2013-14 2014-15 % change from 2010-11 to 2014-15
SOURCE: OFWAT

Anglian 230 212 212 211 211 211 -0.5
Dŵr Cymru 199 190 188 186 185 184 -3.2
Northumbrian-North East 158 150 147 144 141 141 -6.0
Northumbrian-Essex & Suffolk 65 66 66 66 66 66 0.0
Severn Trent 497 483 474 468 456 453 -6.2
South West 84 84 84 84 84 84 0.0
Southern 96 83 93 90 89 88 6.0
Thames 665 674 673 673 673 673 -0.1
United Utilities 464 464 464 464 463 463 -0.2
Wessex 71 71 71 71 71 71 0.0
Yorkshire 325 297 297 297 297 297 0.0
Sembcorp Bournemouth 22 22 22 22 22 21 -4.5
Bristol 50 52 51 50 49 49 -5.8
Cambridge 13.7 14.0 14.0 14.0 14.0 14.0 0.0
Dee Valley 9.92 10.2 10.2 10.2 10.2 10.2 0.0
Portsmouth 30 30 30 30 30 30 0.0
South East 95 95 95 94 94 93 -2.1
South Staffordshire 73 74 74 74 74 74 0.0
Sutton & East Surrey 25 25 25 25 25 25 0.0
Veolia Water Central 181 185 185 185 185 185 0.0
Veolia Water East 5.02 5.1 5.1 5.1 5.1 5.1 0.0
Veolia Water South East 7.21 7.9 7.8 7.7 7.6 7.5 -5.1
Whole industry 3,365 3,294 3,288 3,271 3,252 3,245 -1.5

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guide

Mesaj  pierderiapa la data de Joi Iun 14, 2012 11:09 pm

The guide:

Introduction to Leakage Detection
Hydraulics and Network Analysis
District Meter Area Management
Metering for Leakage Detection
Detection Equipment
Equipment and Leakage Detection
Techniques for Trunk Mains
Identification of Mains, Services and Valves
Leakage Identification and Localisation
Leakage Location, Confirmation and Repair
Pressure Monitoring and Management
The Economics of Leakage Management
Interpretation and Use of Night Flow Data

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