Water - Footnotes
1) Figures for financial year.
2) 2012/13 data subject to Water Industry Commission confirmation.
3) The figure for raw water abstracted for 2012/13, is the corporate data submitted to SEPA. However, this is required to be collected over the calendar year, 2012 whilst treated water produced data is based on the business reporting year, April 2012 to March 2013. Since 2010/11 raw water abstracted has been based on metered data. Prior to 2010/11 it was estimated based on a calculation methodology.
4) Figures for raw water abstracted and treatment process losses and raw water mains losses are estimates up to 2009/10. In 2010, slight corrections have been made to years 07/08 and 08/09.
5) Total Top Down Leakage is the summation of Scottish Water distribution network losses and customer supply side leakage, as calculated using ISO9001 Water Balance methodologies.
6) Treated water produced is measured and is the figure reported in the SW Annual Return to WICS.
7) Operational use includes standpipe volumes, fire service use, hydrant misuse, void property use, as well as use by Scottish Water in Offices, waste water treatment works, the distribution network and sewer jetting.
8) Only parameters available over the whole period are included in the indicator; thus it is not possible to equate these results with those using the latest classification based on all the parameters in the Water Framework Directive.
9) Data are expressed as mg N/l. To convert to mg NO3/l (nitrate), multiply by 62/14.
10) A set of around 176 sites was used in 2012, based on nitrate directive locations. Previously around 200 sites had been used. The reduction in sites is a consequence of SEPA moving to a risk based monitoring network. The risk based approach means that sites with background levels and little risk of anthropogenic influence are no longer monitored reducing the percentage in the lower categories and increasing the percentage in the higher categories.
11) This applies to most European rivers though for some rivers up to 1 mg N/l is reported. European Environment Agency, 'Indicator Fact Sheet'. '(WEU02) Nutrients in Rivers'.
12) In Aberdeen, Moray, Banff and Buchan; Strathmore and Fife; Lothians and Borders; and Lower Nithsdale.
13) Under The Designation of Nitrate Vulnerable Zones (Scotland) Regulations 2002 and The Designation of Nitrate Vulnerable Zones (Scotland) (No. 2) Regulations 2002 and EC Nitrates Directive (91/676/EEC) Annex 1A(3).
14) Soluble reactive phosphorus was measured as µg P/l. To convert to µg PO4/l (orthophosphate), multiply by 95/31.
Email: Callum Neil
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