NAMWA
The Dutch system of Water Accounts
Sjoerd Schenau - CBS (National Accounts)
Rob van der Veeren - RIZA
Roy Brouwer - IVM
Structure
– Introduction to NAMWA
– Work on NAMWA in the
Netherlands
– Results and indicators
– Future work
What is NAMWA?
System of National Accounts (SNA)
National Accounting Matrix including
Environmental Accounts (NAMEA)
National Accounting Matrix including
Water Accounts (NAMWA)
Work on NAMWA in the
Netherlands
– Based on an experimental NAMWA published
in 1996
– Collaboration between RIZA and Statistics
Netherlands
– 2002: Extension of original NAMWA
– 2003: further extension: addition of more
pollutants, more detail for river basins
Scale: National and River Basins
Structure NAMWA
NAMWA exists of three parts:
1. Economic accounts, primarily based on
the national accounts (euros)
2. Emission accounts, based on emission
registration (kg)
3. Water extraction and discharge account,
based on the water survey (m3)
Economic parameters
– National: overview of the expenses (vertical)
and receipts (horizontal) with specific attention
to water (waterboards, sewage taxes etc.)
– Regional: production, use, value added,
number of employees per industry
NAMWA : the matrix
Account nr 1-10
1-10
NAM (economic); mln
Euros
11 Water balance; mln m3
12 Emission balance; kg
13 Water balance; mln m3
14 Emission balance; kg
11
12
13
14
Distribution of economic value added
generated in the various river basins
in the Netherlands
Rhine west
Rhine mid
Rhine east
Rhine north
Meuse
3%
3%
21%
50%
5%
10%
8%
Scheldt
Ems
Economic production 1996-2000
140
130
120
nationaal
rijnwest
rijnmidden
rijnnoord
rijnoost
110
100
90
80
1996
1997
1998
1999
2000
Economic production 1996-2000:
agriculture
140
130
120
nationaal
west
midden
noord
oost
110
100
90
80
1996
1997
1998
1999
2000
Emission accounts
– National en regional emission registration
– overview of the production and absorption of
emissions by the industries
– 78 substances: o.a. P, N, heavy metals,
pesticides etc.
Origin of pollutants
P
N
Heavy metals
Waste water
Consumers
x
x
x x x x x
x
Producers
–Agriculture
–Fisheries
–Mining
–etc
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Input from abroad
x
x
x x x x x
x
Total
x
x
x x x x x
x
x
x
x
x
x
x
x
x
x
x
x
x
Destination of pollutants
P
N
Heavy metals
Waste water
Absorption
x
x
x x x x x
x
Export abroad
x
x
x x x x x
x
x
x
Env. indicators
–eutrophication
–Waste water
–Heavy metals
Total
x
x x x x x
x
x
x x x x x
x
GDP and environmental
indicators: national
130
125
120
115
wastewater
nutrients
heavy metals
GDP
110
105
100
95
90
85
80
1996
1997
1998
1999
2000
2001
GDP and environmental indicators :
SCHELD
140
130
120
110
wastewater
nutrients
heavy metals
GDP
100
90
80
70
60
1996
1997
1998
1999
2000
2001
Distribution emissions over the
industries (2000)
100%
80%
other
transport
60%
environmental services
industry
40%
agriculture
households
20%
0%
As Cd Cr
Cu Hg Pb
Ni
Zn
P
N
Water accounts
– Water survey from the CBS (national and
regional)
– every 5 years
– production and use of fresh water (ground-,
surface- en drinking water) per NACE
Use of salt surfacewater
5000
4500
4000
3500
mln m3
3000
1996
2500
2001
2000
1500
1000
500
0
refineries
Chemical industry
Basic metals
manufactering
electricity supply
Use of water in 2001
100%
90%
80%
SCHELD
70%
MEUSE
60%
EEMS
50%
MID
EAST
40%
NORD
30%
WEST
20%
10%
0%
tapwater
sweet
groundwater
brackish
groundwater
sweet surface
water
salt
surfacewater
Results so far
– National NAMWA for 1996 t/m 2001
– Regional NAMWA for 1996 t/m 2000
Indicators
Eco-efficiency:
- value added and water extraction by industry
- value added and emissions to water by
industry
Eco-efficiency branches of
industry
80
70
60
Extraction
(millions m3)
50
40
Value added
(billions of
euros)
30
20
10
0
Agri Energ Chem Paper Food
Eco-efficiency branches of industry
80
70
60
50
Emission
(kg tons N)
Value added
(billions of euros)
40
30
20
10
0
Agri
Energ
Chem
Trans
Other
Indicators
Eco-efficiency:
- value added and water extraction by industry
- value added and emissions to water by
industry
Cost recovery rates based on:
- Production costs water services
- Environmental taxes related to water
Total costs and revenues of the water service
wastewater treatment (in million euros)
Costs
Revenues
1998
1999
1400
1200
1000
800
600
400
200
0
1996
1997
2000
2001
Usefulness of NAMWA for WFD (1)
NAMWA provides a consistent integrated
economic- environmental accounting
framework which provides
information about:
- Intensity of water use by branches of industry
- The physical flows of supply of water services
- Production costs of water services
- Environmental taxes related to water
at National and River Basin level
Usefulness of NAMWA for WFD (2)
Hence NAMWA provides indicators about:
- Extent and relative significance of water
services
- Extent and relative significance of water use
- Cost recovery
- Application of Polluter Pays Principle
Future work
• NAMWA as a regular ‘product’ from 2002
onwards
• Calculate data for 1990-1995
• Waterbalance every year
• Composition of indicators
• Publication of the data (also on the internet)