Physical Supply and Use tables (PSUT) SEEAW training New York, 13-17 November 2006

Physical Supply and Use tables Physical Supply and Use tables (PSUT)(PSUT)

SEEAW trainingNew York, 13-17 November 2006

OutlineOutline

• What do PSUT measure?What do PSUT measure?• Basic definitionsBasic definitions• Industry breakdownIndustry breakdown• SEEAW standard tablesSEEAW standard tables• Supplementary tables/informationSupplementary tables/information

• Breakdown of water flowsBreakdown of water flows• Matrix of flows within the economyMatrix of flows within the economy• Water losses in distributionWater losses in distribution

What do PSUT measure?What do PSUT measure?

PSUT describe in physical units

• The exchanges of water between the environment and the economy (abstraction and returns)

• The exchanges of water within the economy (supply and use within the economy)

Why compiling PSUTWhy compiling PSUT

PSUT are important because PSUT are important because

• They allow for the identification of the They allow for the identification of the activities/sectors which put more pressure on activities/sectors which put more pressure on the environment the environment

• They provides indication of the more They provides indication of the more consumptive useconsumptive use

• Together with monetary data, they provide Together with monetary data, they provide information for water allocation policiesinformation for water allocation policies

Basic concepts and definitionsBasic concepts and definitions

Economic activity/Households

UseUse

From the From the environment environment (abstraction)(abstraction)

From another From another economic economic unitunit

Supply

To the To the environment environment (returns)(returns)

To another To another economic economic unitunit

EvapotranspireEvapotranspire

PSUTPSUT

• By columns, industries, households and the Rest of By columns, industries, households and the Rest of the worldthe world

• By rows, types of flowsBy rows, types of flows

SNA identity “Supply is equal to the Use” holdsSNA identity “Supply is equal to the Use” holds

They consist of three part:They consist of three part:• Flows from the environment to the economyFlows from the environment to the economy• Flows within the economyFlows within the economy• Flows from the economy to the environmentFlows from the economy to the environment

Industry breakdownIndustry breakdown

Standard PSUT distinguishes the following groups:Standard PSUT distinguishes the following groups:

ISIC 1-3 which includes ISIC 1-3 which includes AgricultureAgriculture, , ForestryForestry and and FishingFishing; ;

ISIC 5-33, 41-43 which includes: ISIC 5-33, 41-43 which includes: Mining and Mining and quarryingquarrying, , ManufacturingManufacturing and and ConstructionConstruction; ;

ISIC 35 ‑ ISIC 35 ‑ Electricity, gas, steam and air conditioning Electricity, gas, steam and air conditioning supplysupply; ;

ISIC 36 ‑ ISIC 36 ‑ Water collection, treatment and supplyWater collection, treatment and supply; ; ISIC 37 ‑ ISIC 37 ‑ SewerageSewerage; ; ISIC 38, 39, 45-99, which corresponds to the ISIC 38, 39, 45-99, which corresponds to the Service Service

industriesindustries. .


ISIC 36 and 37 are key activities for the ISIC 36 and 37 are key activities for the distribution of water and wastewater servicesdistribution of water and wastewater services

ISIC 35 is a major user of water for ISIC 35 is a major user of water for hydroelectric power generation and cooling hydroelectric power generation and cooling purposes: it abstracts and returns into the purposes: it abstracts and returns into the environment enormous quantities of water.environment enormous quantities of water. Aggregating information on water use and Aggregating information on water use and supply by ISIC 35 with that of other supply by ISIC 35 with that of other industries would provide misleading industries would provide misleading information. information.


• ISIC does not classify according to the ISIC does not classify according to the institutional sector (government, households, institutional sector (government, households, NPISH and corporations) to which a statistical NPISH and corporations) to which a statistical unit belongs.unit belongs.

• Activities carried out by government units that Activities carried out by government units that are specifically attributable to other divisions are specifically attributable to other divisions of ISIC should be classified in the appropriate of ISIC should be classified in the appropriate division of ISIC and not in division 84, ISIC division of ISIC and not in division 84, ISIC Rev. 4. Rev. 4.

Flows from the environment to the economy

1-35-33, 41-43 35 36 37

38,39, 45-99 Total

1. Total abstraction (=1.a+1.b=1.i+1.ii)

1.a. Abstraction for own use

1.b. Abstraction for distribution

1.i. From water resources:

1.i.1 Surface water

1.i.2 Groundwater

1.i.3 Soil water

1.ii. From other sources

1.ii.1 Collection of precipitation

1.ii.2 Abstraction from the sea

Millions m3

Industries (by ISIC categories)

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From the environment

Basic concepts and definitionsBasic concepts and definitions

AbstractionAbstraction is defined as the a is defined as the amount of water mount of water that is removed from any source, either that is removed from any source, either permanently or temporarily, in a given period permanently or temporarily, in a given period of time for consumption and production of time for consumption and production activities.activities. Water used for hydroelectric power Water used for hydroelectric power generation, is also considered as abstraction. generation, is also considered as abstraction.

AbstractionAbstraction

Abstraction from soil waterAbstraction from soil water includes rainfed agriculture includes rainfed agriculture

Collection of precipitationCollection of precipitation is the is the direct collection of direct collection of precipitation for production and consumption activitiesprecipitation for production and consumption activities (rain roof harvest)(rain roof harvest)

Abstraction from the seaAbstraction from the sea includes the cases of water includes the cases of water used for cooling purposes (the corresponding used for cooling purposes (the corresponding wastewater flow is generally returned to the sea or wastewater flow is generally returned to the sea or ocean) and for desalination processesocean) and for desalination processes

Flows within the economy

1-35-33, 41-43 35 36 37

38,39, 45-99 Total

2. Use of water received from other economic units

4. Supply of water to other economic units

of which:

4.a. Reused water

4.b. Wastewater to sewerage

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Water supplyWater supply

• Water supply is recorded net of losses in Water supply is recorded net of losses in distributiondistribution

• Water losses in distribution: Water losses in distribution: volume of water volume of water lost during transport through leakages and lost during transport through leakages and evaporation between a point of abstraction and evaporation between a point of abstraction and a point of use, and between points of use and a point of use, and between points of use and reuse.reuse.

• Losses in distribution may occur because of Losses in distribution may occur because of leakages and evaporationleakages and evaporation

WastewaterWastewater

Wastewater:Wastewater: water which is of no further immediate water which is of no further immediate value to the purpose for which it was used or in the value to the purpose for which it was used or in the pursuit of which it was produced because of its pursuit of which it was produced because of its quality, quantity or time of occurrence.quality, quantity or time of occurrence.

Wastewater can be discharged directly into the Wastewater can be discharged directly into the environment (environment (return flowreturn flow), supplied to a treatment ), supplied to a treatment facility (ISIC 37) (facility (ISIC 37) (wastewater to Seweragewastewater to Sewerage) or ) or supplied to another industry for further use (supplied to another industry for further use (reused reused waterwater). ).

Reused waterReused water

Reused water: Reused water: wastewater delivered to a user for wastewater delivered to a user for further use with or without prior treatment. further use with or without prior treatment. Recycling within industrial sites is excluded.Recycling within industrial sites is excluded.

It is important to record this reused water as it It is important to record this reused water as it can alleviate the pressure on water resources can alleviate the pressure on water resources by reducing direct abstraction of water.by reducing direct abstraction of water.

Flows from the economy to the environment

1-35-33, 41-43 35 36 37

38,39, 45-99 Total

5. Total returns (=5.a+5.b)

5.a. To water resources

5.a.1. Surface water

5.a.2. Groundwater

5.a.3. Soil water

5.b. To other sources (e.g. sea water)

To the environment

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Standard PSUTStandard PSUT

1-35-33, 41-43 35 36 37

38,39, 45-99 Total

1. Total abstraction (=1.a+1.b=1.i+1.ii)

1.a. Abstraction for own use

1.b. Abstraction for distribution

1.i. From water resources:

1.i.1 Surface water

1.i.2 Groundwater

1.i.3 Soil water

1.ii. From other sources

1.ii.1 Collection of precipitation

1.ii.2 Abstraction from the sea

Within the economy

2. Use of water received from other economic units

1-35-33, 41-43 35 36 37

38,39, 45-99 Total

4. Supply of water to other economic units

of which:

4.a. Reused water

4.b. Wastewater to sewerage

5. Total returns (=5.a+5.b)

5.a. To water resources

5.a.1. Surface water

5.a.2. Groundwater

5.a.3. Soil water

5.b. To other sources (e.g. sea water)

From the environment

7. Consumption (=3-6)

3. Total use of water (=1 + 2)

Physical supply table

Millions m3


Within the economy

To the environment

6.Total supply of water (=4+5)

Physical use table

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Water UseWater Use

Water use:Water use: water intake of industries and households for water intake of industries and households for production and consumption activities. Water Use is the production and consumption activities. Water Use is the sum of sum of water use within the economywater use within the economy and and water use from water use from the environmentthe environment..

Water use within the economyWater use within the economy: water intake for : water intake for production and consumption activities, which is production and consumption activities, which is distributed by industries or households and by the Rest distributed by industries or households and by the Rest of the World (Imports). of the World (Imports).

Water use from the environmentWater use from the environment: water abstracted from : water abstracted from water resources, seas and oceans, and precipitation water resources, seas and oceans, and precipitation collected by industries and households for production collected by industries and households for production and consumption activities, including rainfed and consumption activities, including rainfed agriculture.agriculture.

Water SupplyWater Supply

Water supply: Water supply: water leaving/flowing-out from an economic unit water leaving/flowing-out from an economic unit (Industries, Households and rest of the world). Water supply is (Industries, Households and rest of the world). Water supply is the sum of the sum of water supply to other economic unitswater supply to other economic units and and water supply water supply to the environmentto the environment. .

Water supply to the environment Water supply to the environment (also Water returns): water (also Water returns): water returned into the environment during a given period of time after returned into the environment during a given period of time after use. Returns can be classified according to the receiving media use. Returns can be classified according to the receiving media (i.e. water resources and sea water) and to the type of water (e.g. (i.e. water resources and sea water) and to the type of water (e.g. treated water, cooling water, etc.).treated water, cooling water, etc.).

Water supply within the economy:Water supply within the economy: water distributed to water distributed to households and industries (including agriculture) and to the rest households and industries (including agriculture) and to the rest of the world (exports). Water supply within the economy is net of of the world (exports). Water supply within the economy is net of losses in distribution. losses in distribution.

Water consumptionWater consumption

Water consumptionWater consumption: part of water use which is not : part of water use which is not distributed to other economic units and does not return distributed to other economic units and does not return to the environment (to water resources, sea and ocean) to the environment (to water resources, sea and ocean) because during use it has been incorporated into because during use it has been incorporated into products, consumed by households or livestock. products, consumed by households or livestock.

It is calculated as a difference between total use and total It is calculated as a difference between total use and total supply, thus it may include losses due to evaporation supply, thus it may include losses due to evaporation occurring in distribution and apparent losses due to occurring in distribution and apparent losses due to illegal tapping and malfunctioning meteringillegal tapping and malfunctioning metering

Supplementary information (1)Supplementary information (1)

Abstraction for own useAbstraction for own use

• Hydroelectric power generationHydroelectric power generation

• Irrigation waterIrrigation water

• Mine waterMine water

• Urban runoffUrban runoff

• Cooling waterCooling water

• OtherOther


Use of water received from other economic unitsUse of water received from other economic units

• Reused waterReused water

Supply of water to other economic unitsSupply of water to other economic units

• Desalinated waterDesalinated water


Matrix of flows within the economy

1-35-33, 41-43 35 36 37

38,39, 45-99 Total

1

2-33, 41-43

35

36

37

38,39, 45-99

Total

Households

Rest of the w orld

Total use

to:

from:


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Tables on losses in distribution

1-3

5-33, 41-43 35 36 37

38,39, 45-99 Total

1. (Net) Supply of w ater to other economic units

2. Losses in distribution (=2.a+2.b)

2.a Leakages

2.b Other (e.g. evaporation, apparent losses)

3. Gross supply w ithin the economy (=1.+2.)

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Documents

Physical Supply and Use tables (PSUT) SEEAW training New York, 13-17 November 2006