WHAT ARE THE POSSIBLE SOLUTIONS? The remaining options were bundled together to form several solutions or scenarios. These were grouped into four sets – the base scenario, the water scenarios, the sewer scenarios and the small village scenarios. The ‘base scenario’ involves all the things we plan to undertake over the next 30 years – like reducing water use, reducing stormwater infiltration, continuing to undertake catchment management projects, continuing our recycled water schemes, and constructing water storages at Bulahdelah, Stroud and Gloucester. The components of the base scenario are listed in more detail in Appendix 2. A summary of the other scenarios, including a description, the Typical Residential Bill value and the Project Reference Group Workshop 1, environmental and social scores, is shown in Table 5. Selecting one scenario from each of the water, sewer and small village scenarios will provide a total solution to ensure that all identified issues are addressed.
The Typical Residential Bill is an indicator used to represent the average annual water and sewer cost for households.
The ranking of the scenario combinations, based on Triple Bottom Line analysis, is shown in Table 4 TABLE 4 - COMBINED WATER AND SEWER SCENARIO SOCIAL AND E NVIRONMENTAL TRIPLE BOTTOM LINE RANKING
Low reuse
Mid-level reuse
High-level reuse
IPR
New storage
5
4
2
-
Desalination
7
6
3
-
IPR
-
-
-
1
Triple Bottom Line is a method of analysis that looks at social, environmental and economic factors. It is sometimes referred to as the three Ps – people, planet and profit.
IWCM Strategy 2015
29