64
4 Sefficiency (Sustainable Efficiency)
(Benito 2009) was funded by the European Commission, Directorate-General
Environment and produced a report that focusses on urban (buildings and industries) and agriculture. This report defines water efficiency as “the relationship
between the amount of water required for a particular purpose and the amount of
water used or delivered”, which is a CE type concept.
Third, the Portuguese Water Use Efficiency Plan - PNUEA (National Laboratory
of Civil Engineering 2001) is used in many activities related to water, such as, River
Basin Management Plans (Portuguese Environment Agency 2019b), and Strategic
Environmental Assessment of the Roadmap for Carbon Neutrality 2050 (Portuguese
Environment Agency 2019a). PNUEA is defined for various types of water users,
such as, urban, agriculture and industry. In its indicator section, it defines water
use efficiency as the ratio of “useful consumption” to “effective demand”, and sets
water loss (%) equal to (100 – efficiency). This CE type equation does not explain
the meaning of the words useful, consumption and effective. In practice, PNUEA
uses Eq. (4.16) and defines various efficiency and investment targets that have been
adopted by the decision-makers.
Fig. 4.16 Contour lines of C1-WC1-cSE trade-offs and patterns along four WR1 values
4 Sefficiency (Sustainable Efficiency)
(Benito 2009) was funded by the European Commission, Directorate-General
Environment and produced a report that focusses on urban (buildings and industries) and agriculture. This report defines water efficiency as “the relationship
between the amount of water required for a particular purpose and the amount of
water used or delivered”, which is a CE type concept.
Third, the Portuguese Water Use Efficiency Plan - PNUEA (National Laboratory
of Civil Engineering 2001) is used in many activities related to water, such as, River
Basin Management Plans (Portuguese Environment Agency 2019b), and Strategic
Environmental Assessment of the Roadmap for Carbon Neutrality 2050 (Portuguese
Environment Agency 2019a). PNUEA is defined for various types of water users,
such as, urban, agriculture and industry. In its indicator section, it defines water
use efficiency as the ratio of “useful consumption” to “effective demand”, and sets
water loss (%) equal to (100 – efficiency). This CE type equation does not explain
the meaning of the words useful, consumption and effective. In practice, PNUEA
uses Eq. (4.16) and defines various efficiency and investment targets that have been
adopted by the decision-makers.
Fig. 4.16 Contour lines of C1-WC1-cSE trade-offs and patterns along four WR1 values