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09 Water

DependenciesDefinitionMethodologyExamples

Dependencies

Definition

Emissions associated with the supply and treatment of water at owned sites and tenanted sites where the reporter holds billing responsibility to the water supplier.

Methodology

Data map

Description of data available Reduced calculation [RC] Standard calculation [SC] Optimal Calculation [OC]
Water supply and treatment billing (£) X
Monitored annual consumption, >10% estimated (m3) X
Monitored annual consumption, ≤10% estimated (m3) X

Reduced calculation: Water

Equation 9.1 The RC approach for calculating emissions associated with the use of water.

( WatSuppCost × WatSICFac ) + ( WatTreat × WatSICFac ) 1000 = tCO 2 e  [RC]

Where:

  • WatSuppCost = The cost of water supply (£).
  • WatTreatCost = The cost of water treatment (£).
  • WatSICFac = The value assigned to "natural water; water treatment and supply services" from a date relevant dataset (kgCO2e/£).

Standard calculation: Water

Equation 9.2 The SC approach for calculating emissions associated with the use of water.

( WatSuppVol × WatSuppFac ) + ( WatTreatVol × WatTreatFac ) . . . 1000 = tCO 2 e  [SC]

Where:

  • WatSuppVol = The volume of water supplied (m3) where >10% estimated.
  • WatSuppFac = The value assigned to emissions associted with supply of water from a date relevant dataset (kgCO2e/m3).
  • WatTreatVol = The volume of water treated (m3).
  • WatTreatFac = The value assigned to emissions associted with treatment of water from a date relevant dataset (kgCO2e/m3).

Optimal calculation: Water

Equation 9.3 The OC approach for calculating emissions associated with the use of water.

( WatSuppVol × WatSuppFac ) + ( WatTreatVol × WatTreatFac ) . . . 1000 = tCO 2 e  [OC]

Where:

  • WatSuppVol = The volume of water supplied (m3) where ≤10% estimated.
  • WatSuppFac = The value assigned to emissions associted with supply of water from a date relevant dataset (kgCO2e/m3).
  • WatTreatVol = The volume of water treated (m3).
  • WatTreatFac = The value assigned to emissions associted with treatment of water from a date relevant dataset (kgCO2e/m3).

Examples

Reduced calculation: Water

Jeremy sources theDepartment for Environment, Food and Rural Affairs (DEFRA) UK and England's carbon footprint to 2019: UK Full dataset 1990 - 2019, including conversion factors by SIC code dataset. Using the information most relevant to the period being assessed, Jeremy makes a note of the GHG (kgCO2e per £) value for 'Natural water; water treatment and supply services'.

Jeremy then multiplies the costs for supply (£400) and treatment (£600) by the intensity metric sourced from DEFRA (0.215kgCO2e/£). Jeremy wants to report in tonnes, therefore divides the sum by 1,000 and then rounds to two decimal places. Along with adding their units (tCO2e), Jeremy adds the [RC] tag to support transparency around how this figure was calculated. The final value added to Jeremey’s report on emissions associated with water supply and treatment is 0.22tCO2e [RC].

Equation 9.4 A worked example of an RC calculation of emissions associated with supply and treatment of water.

( 400 × 0.215 ) + ( 600 × 0.215 ) 1000 = 0.22 tCO 2 e  [RC]

Standard calculation: Water

For more information on ascertaining whether the standard calculation (e.g. where more than, or equal to, 11% of consumption data has been estimated) can be used and a transferable method for using, please see Fossil Fuels.

Optimal calculation: Water

For more information on ascertaining whether the optimal calculation (e.g. where less than, or equal to, 10% of consumption data has been estimated) can be used and a transferable method for using, please see Fossil Fuels.