282
J. F. Guidolini et al.
At GD8, the social subsystem presented 0.2539 weight, the economic subsystem,
0.3935 and the environmental subsystem, 03526.
Thus, the economic and environmental subsystems at the two Rio Grande Basin
water management units are noted as presenting great responsibility in achieving
sustainable sanitation conditions, corresponding to approximately 74% of the total
weight.
3.3 Sanitation Sustainability Condition Index (CSS) at GD1
and GD8 During the Analyzed Study Periods
The Sanitation Sustainability Condition Index (CSS) at GD1 and GD8 are presented
in Table 4 for each analyzed period. At GD1, the sanitation sustainability condition,
in general, evolved from 2008 to 2014. In 2008, this unit reached a CSS of 0.3721,
decreasing to 0.3128 in 2010, increasing again to 0.5023 in 2012 and ending 2014
with a CSS of 0.6670. Thus, between 2010 and 2012, GD1 was characterized by a
weak stage of sustainable development concerning sanitation, evolving to the basic
stage of sustainable development for sanitation between 2012 and 2014.
On the other hand, GD8 regressed sanitation sustainability conditions between
2008 and 2014. In 2008, this unit reached a CSS of 0.5271, decreasing to 0.3861.
In 2012, an increase to 0.5033 was observed, but another decrease was again noted
in 2014, to 0.3603. Thus, in 2014, GD8 was characterized as at a weak sanitation
sustainable development stage.
4 Discussion
The application of the Entropy Weight Method allows for the measurement of the
amount of useful information provided by the sustainability indicator. When the
magnitude of the value among the evaluation objects for the same indicator is high,
entropy is low (Zhi-Hong et al. 2006). Therefore, the indicator will provide more
useful information, and its weight will be higher. The indicators with the highest weight and the lowest entropy for the GD1 and GD8 social subsystems were
S6/S7 (Infant Mortality and Number of Hospitalizations for Waterborne Diseases)
and S5/S6 (Untreated Water and Infant Mortality), respectively. These indicators
adequately reflect the sanitation situation in the assessed water management units.
Despite the notable advance of the sanitation sector throughout the study period, a
significant distance to sanitation service universalization is still noted. In addition,
advance occurs very unevenly.
In 2013, GD1 comprised a population of approximately 363 thousand people. The
treated sewage collection rate was of only 12.8%, while GD8 presented a sewage collection rate of 43% during the same period and housed a population of approximately
J. F. Guidolini et al.
At GD8, the social subsystem presented 0.2539 weight, the economic subsystem,
0.3935 and the environmental subsystem, 03526.
Thus, the economic and environmental subsystems at the two Rio Grande Basin
water management units are noted as presenting great responsibility in achieving
sustainable sanitation conditions, corresponding to approximately 74% of the total
weight.
3.3 Sanitation Sustainability Condition Index (CSS) at GD1
and GD8 During the Analyzed Study Periods
The Sanitation Sustainability Condition Index (CSS) at GD1 and GD8 are presented
in Table 4 for each analyzed period. At GD1, the sanitation sustainability condition,
in general, evolved from 2008 to 2014. In 2008, this unit reached a CSS of 0.3721,
decreasing to 0.3128 in 2010, increasing again to 0.5023 in 2012 and ending 2014
with a CSS of 0.6670. Thus, between 2010 and 2012, GD1 was characterized by a
weak stage of sustainable development concerning sanitation, evolving to the basic
stage of sustainable development for sanitation between 2012 and 2014.
On the other hand, GD8 regressed sanitation sustainability conditions between
2008 and 2014. In 2008, this unit reached a CSS of 0.5271, decreasing to 0.3861.
In 2012, an increase to 0.5033 was observed, but another decrease was again noted
in 2014, to 0.3603. Thus, in 2014, GD8 was characterized as at a weak sanitation
sustainable development stage.
4 Discussion
The application of the Entropy Weight Method allows for the measurement of the
amount of useful information provided by the sustainability indicator. When the
magnitude of the value among the evaluation objects for the same indicator is high,
entropy is low (Zhi-Hong et al. 2006). Therefore, the indicator will provide more
useful information, and its weight will be higher. The indicators with the highest weight and the lowest entropy for the GD1 and GD8 social subsystems were
S6/S7 (Infant Mortality and Number of Hospitalizations for Waterborne Diseases)
and S5/S6 (Untreated Water and Infant Mortality), respectively. These indicators
adequately reflect the sanitation situation in the assessed water management units.
Despite the notable advance of the sanitation sector throughout the study period, a
significant distance to sanitation service universalization is still noted. In addition,
advance occurs very unevenly.
In 2013, GD1 comprised a population of approximately 363 thousand people. The
treated sewage collection rate was of only 12.8%, while GD8 presented a sewage collection rate of 43% during the same period and housed a population of approximately