❓ A WA parliamentary question seeks detailed water usage and savings data for Kalgoorlie-Boulder following water conservation initiatives, and explores the potential and cost of implementing similar schemes in Perth. The answer provides some data but acknowledges limitations in calculating precise year-by-year savings.
AnsweredQoN 2032Legislative Assembly
QuestionView source ↗
(1) Reflecting the success of the water conservation initiatives undertaken in Kalgoorlie-Boulder in 1996 as described in your media statement of 12 September 2003, how much water (both in percentage and total volume terms) has been saved in Kalgoorlie-Boulder as a result of these initiatives in each year since the scheme was implemented in 1996?
(2) How much water sourced via the Mundaring pipeline was being used in the Kalgoorlie-Boulder area for each of the years 1991 to 1995 inclusive?
(3) Does the volume of saved water refer to the total water volume delivered to Kalgoorlie-Boulder via the Mundaring pipeline or does it include water sourced locally and, if so, from what sources, in what volumes, and used for what purposes?
(4) What would be the estimated savings in domestic water usage if similar initiatives were applied to all households in metropolitan Perth?
(5) What would be the estimated cost of such a scheme if it was instituted in the Perth metropolitan area?
(2) How much water sourced via the Mundaring pipeline was being used in the Kalgoorlie-Boulder area for each of the years 1991 to 1995 inclusive?
(3) Does the volume of saved water refer to the total water volume delivered to Kalgoorlie-Boulder via the Mundaring pipeline or does it include water sourced locally and, if so, from what sources, in what volumes, and used for what purposes?
(4) What would be the estimated savings in domestic water usage if similar initiatives were applied to all households in metropolitan Perth?
(5) What would be the estimated cost of such a scheme if it was instituted in the Perth metropolitan area?
AnswerView source ↗
Answered
21 October 2003
Responded by
Minister representing the Minister for Government Enterprises
Response time
34 days
(1) It is not possible to calculate savings directly attributable to conservation initiatives on a year by year basis However, assessments can be made on the basis of medium term trends pre and post the implementation of the initiative. The average usage figures per property for Pre Water Efficiency Program 1995 and Post Water Efficiency Program 1995 are shown on the table below: Description 5 year average 6 year average Percentage Difference (1991-1995) (1996 – 2001) The average town water usage per property was 549 kL/a 480 kL/a 12.60% The average non-mining use for the six years after the program was 5.5GL per annum. From this base it can be inferred (using 12.6% variance) that the average annual savings have been in the order of 0.7GL. This represents a saving of 4.2GL for the period 1996 to 2001. Since 2001, the community has been subject to restriction and usage patterns have altered. For this reason no inferences can be drawn from recent consumption records. (2) Kalgoorlie-Boulder Annual Water Use (All Use Ex Mundaring): Year No of Services Town Use (kL) Mining Use (kL) Total Use (kL) Pre-Kalgoorlie-Boulder Water Efficiency Program – Water Use Totals 1990/1 9,205 5,579,764 1,987,026 7,566,789 1991/2 9,323 5,544,148 1,571,627 7,115,775 1992/3 9,633 4,997,926 1,477,172 6,475,098 1993/4 10,046 5,479,914 1,602,751 7,082,665 1994/5 10,514 5,054,902 1,979,130 7,034,032 (3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
However, assessments can be made on the basis of medium term trends pre and post the implementation of the initiative. The average usage figures per property for Pre Water Efficiency Program 1995 and Post Water Efficiency Program 1995 are shown on the table below: Description 5 year average 6 year average Percentage Difference (1991-1995) (1996 – 2001) The average town water usage per property was 549 kL/a 480 kL/a 12.60% The average non-mining use for the six years after the program was 5.5GL per annum. From this base it can be inferred (using 12.6% variance) that the average annual savings have been in the order of 0.7GL. This represents a saving of 4.2GL for the period 1996 to 2001. Since 2001, the community has been subject to restriction and usage patterns have altered. For this reason no inferences can be drawn from recent consumption records. (2) Kalgoorlie-Boulder Annual Water Use (All Use Ex Mundaring): Year No of Services Town Use (kL) Mining Use (kL) Total Use (kL) Pre-Kalgoorlie-Boulder Water Efficiency Program – Water Use Totals 1990/1 9,205 5,579,764 1,987,026 7,566,789 1991/2 9,323 5,544,148 1,571,627 7,115,775 1992/3 9,633 4,997,926 1,477,172 6,475,098 1993/4 10,046 5,479,914 1,602,751 7,082,665 1994/5 10,514 5,054,902 1,979,130 7,034,032 (3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
The average usage figures per property for Pre Water Efficiency Program 1995 and Post Water Efficiency Program 1995 are shown on the table below: Description 5 year average 6 year average Percentage Difference (1991-1995) (1996 – 2001) The average town water usage per property was 549 kL/a 480 kL/a 12.60% The average non-mining use for the six years after the program was 5.5GL per annum. From this base it can be inferred (using 12.6% variance) that the average annual savings have been in the order of 0.7GL. This represents a saving of 4.2GL for the period 1996 to 2001. Since 2001, the community has been subject to restriction and usage patterns have altered. For this reason no inferences can be drawn from recent consumption records. (2) Kalgoorlie-Boulder Annual Water Use (All Use Ex Mundaring): Year No of Services Town Use (kL) Mining Use (kL) Total Use (kL) Pre-Kalgoorlie-Boulder Water Efficiency Program – Water Use Totals 1990/1 9,205 5,579,764 1,987,026 7,566,789 1991/2 9,323 5,544,148 1,571,627 7,115,775 1992/3 9,633 4,997,926 1,477,172 6,475,098 1993/4 10,046 5,479,914 1,602,751 7,082,665 1994/5 10,514 5,054,902 1,979,130 7,034,032 (3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
Description 5 year average 6 year average Percentage Difference (1991-1995) (1996 – 2001) The average town water usage per property was 549 kL/a 480 kL/a 12.60% The average non-mining use for the six years after the program was 5.5GL per annum. From this base it can be inferred (using 12.6% variance) that the average annual savings have been in the order of 0.7GL. This represents a saving of 4.2GL for the period 1996 to 2001. Since 2001, the community has been subject to restriction and usage patterns have altered. For this reason no inferences can be drawn from recent consumption records. (2) Kalgoorlie-Boulder Annual Water Use (All Use Ex Mundaring): Year No of Services Town Use (kL) Mining Use (kL) Total Use (kL) Pre-Kalgoorlie-Boulder Water Efficiency Program – Water Use Totals 1990/1 9,205 5,579,764 1,987,026 7,566,789 1991/2 9,323 5,544,148 1,571,627 7,115,775 1992/3 9,633 4,997,926 1,477,172 6,475,098 1993/4 10,046 5,479,914 1,602,751 7,082,665 1994/5 10,514 5,054,902 1,979,130 7,034,032 (3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
The average non-mining use for the six years after the program was 5.5GL per annum. From this base it can be inferred (using 12.6% variance) that the average annual savings have been in the order of 0.7GL. This represents a saving of 4.2GL for the period 1996 to 2001. Since 2001, the community has been subject to restriction and usage patterns have altered. For this reason no inferences can be drawn from recent consumption records. (2) Kalgoorlie-Boulder Annual Water Use (All Use Ex Mundaring): Year No of Services Town Use (kL) Mining Use (kL) Total Use (kL) Pre-Kalgoorlie-Boulder Water Efficiency Program – Water Use Totals 1990/1 9,205 5,579,764 1,987,026 7,566,789 1991/2 9,323 5,544,148 1,571,627 7,115,775 1992/3 9,633 4,997,926 1,477,172 6,475,098 1993/4 10,046 5,479,914 1,602,751 7,082,665 1994/5 10,514 5,054,902 1,979,130 7,034,032 (3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
Since 2001, the community has been subject to restriction and usage patterns have altered. For this reason no inferences can be drawn from recent consumption records. (2) Kalgoorlie-Boulder Annual Water Use (All Use Ex Mundaring): Year No of Services Town Use (kL) Mining Use (kL) Total Use (kL) Pre-Kalgoorlie-Boulder Water Efficiency Program – Water Use Totals 1990/1 9,205 5,579,764 1,987,026 7,566,789 1991/2 9,323 5,544,148 1,571,627 7,115,775 1992/3 9,633 4,997,926 1,477,172 6,475,098 1993/4 10,046 5,479,914 1,602,751 7,082,665 1994/5 10,514 5,054,902 1,979,130 7,034,032 (3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
(2) Kalgoorlie-Boulder Annual Water Use (All Use Ex Mundaring): Year No of Services Town Use (kL) Mining Use (kL) Total Use (kL) Pre-Kalgoorlie-Boulder Water Efficiency Program – Water Use Totals 1990/1 9,205 5,579,764 1,987,026 7,566,789 1991/2 9,323 5,544,148 1,571,627 7,115,775 1992/3 9,633 4,997,926 1,477,172 6,475,098 1993/4 10,046 5,479,914 1,602,751 7,082,665 1994/5 10,514 5,054,902 1,979,130 7,034,032 (3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
(3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
(4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
(5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
However, assessments can be made on the basis of medium term trends pre and post the implementation of the initiative. The average usage figures per property for Pre Water Efficiency Program 1995 and Post Water Efficiency Program 1995 are shown on the table below: Description 5 year average 6 year average Percentage Difference (1991-1995) (1996 – 2001) The average town water usage per property was 549 kL/a 480 kL/a 12.60% The average non-mining use for the six years after the program was 5.5GL per annum. From this base it can be inferred (using 12.6% variance) that the average annual savings have been in the order of 0.7GL. This represents a saving of 4.2GL for the period 1996 to 2001. Since 2001, the community has been subject to restriction and usage patterns have altered. For this reason no inferences can be drawn from recent consumption records. (2) Kalgoorlie-Boulder Annual Water Use (All Use Ex Mundaring): Year No of Services Town Use (kL) Mining Use (kL) Total Use (kL) Pre-Kalgoorlie-Boulder Water Efficiency Program – Water Use Totals 1990/1 9,205 5,579,764 1,987,026 7,566,789 1991/2 9,323 5,544,148 1,571,627 7,115,775 1992/3 9,633 4,997,926 1,477,172 6,475,098 1993/4 10,046 5,479,914 1,602,751 7,082,665 1994/5 10,514 5,054,902 1,979,130 7,034,032 (3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
The average usage figures per property for Pre Water Efficiency Program 1995 and Post Water Efficiency Program 1995 are shown on the table below: Description 5 year average 6 year average Percentage Difference (1991-1995) (1996 – 2001) The average town water usage per property was 549 kL/a 480 kL/a 12.60% The average non-mining use for the six years after the program was 5.5GL per annum. From this base it can be inferred (using 12.6% variance) that the average annual savings have been in the order of 0.7GL. This represents a saving of 4.2GL for the period 1996 to 2001. Since 2001, the community has been subject to restriction and usage patterns have altered. For this reason no inferences can be drawn from recent consumption records. (2) Kalgoorlie-Boulder Annual Water Use (All Use Ex Mundaring): Year No of Services Town Use (kL) Mining Use (kL) Total Use (kL) Pre-Kalgoorlie-Boulder Water Efficiency Program – Water Use Totals 1990/1 9,205 5,579,764 1,987,026 7,566,789 1991/2 9,323 5,544,148 1,571,627 7,115,775 1992/3 9,633 4,997,926 1,477,172 6,475,098 1993/4 10,046 5,479,914 1,602,751 7,082,665 1994/5 10,514 5,054,902 1,979,130 7,034,032 (3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
Description 5 year average 6 year average Percentage Difference (1991-1995) (1996 – 2001) The average town water usage per property was 549 kL/a 480 kL/a 12.60% The average non-mining use for the six years after the program was 5.5GL per annum. From this base it can be inferred (using 12.6% variance) that the average annual savings have been in the order of 0.7GL. This represents a saving of 4.2GL for the period 1996 to 2001. Since 2001, the community has been subject to restriction and usage patterns have altered. For this reason no inferences can be drawn from recent consumption records. (2) Kalgoorlie-Boulder Annual Water Use (All Use Ex Mundaring): Year No of Services Town Use (kL) Mining Use (kL) Total Use (kL) Pre-Kalgoorlie-Boulder Water Efficiency Program – Water Use Totals 1990/1 9,205 5,579,764 1,987,026 7,566,789 1991/2 9,323 5,544,148 1,571,627 7,115,775 1992/3 9,633 4,997,926 1,477,172 6,475,098 1993/4 10,046 5,479,914 1,602,751 7,082,665 1994/5 10,514 5,054,902 1,979,130 7,034,032 (3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
The average non-mining use for the six years after the program was 5.5GL per annum. From this base it can be inferred (using 12.6% variance) that the average annual savings have been in the order of 0.7GL. This represents a saving of 4.2GL for the period 1996 to 2001. Since 2001, the community has been subject to restriction and usage patterns have altered. For this reason no inferences can be drawn from recent consumption records. (2) Kalgoorlie-Boulder Annual Water Use (All Use Ex Mundaring): Year No of Services Town Use (kL) Mining Use (kL) Total Use (kL) Pre-Kalgoorlie-Boulder Water Efficiency Program – Water Use Totals 1990/1 9,205 5,579,764 1,987,026 7,566,789 1991/2 9,323 5,544,148 1,571,627 7,115,775 1992/3 9,633 4,997,926 1,477,172 6,475,098 1993/4 10,046 5,479,914 1,602,751 7,082,665 1994/5 10,514 5,054,902 1,979,130 7,034,032 (3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
Since 2001, the community has been subject to restriction and usage patterns have altered. For this reason no inferences can be drawn from recent consumption records. (2) Kalgoorlie-Boulder Annual Water Use (All Use Ex Mundaring): Year No of Services Town Use (kL) Mining Use (kL) Total Use (kL) Pre-Kalgoorlie-Boulder Water Efficiency Program – Water Use Totals 1990/1 9,205 5,579,764 1,987,026 7,566,789 1991/2 9,323 5,544,148 1,571,627 7,115,775 1992/3 9,633 4,997,926 1,477,172 6,475,098 1993/4 10,046 5,479,914 1,602,751 7,082,665 1994/5 10,514 5,054,902 1,979,130 7,034,032 (3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
(2) Kalgoorlie-Boulder Annual Water Use (All Use Ex Mundaring): Year No of Services Town Use (kL) Mining Use (kL) Total Use (kL) Pre-Kalgoorlie-Boulder Water Efficiency Program – Water Use Totals 1990/1 9,205 5,579,764 1,987,026 7,566,789 1991/2 9,323 5,544,148 1,571,627 7,115,775 1992/3 9,633 4,997,926 1,477,172 6,475,098 1993/4 10,046 5,479,914 1,602,751 7,082,665 1994/5 10,514 5,054,902 1,979,130 7,034,032 (3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
(3) The volume of saved water refers only to potable water delivered to Kalgoorlie-Boulder via the Goldfields & Agricultural Water Supply Scheme. (4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
(4) The estimated savings, if similar initiatives were offered to all households (Kalgoorlie was a voluntary program) in metropolitan Perth, has been assessed at approximately 5.5GL per annum. (5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
(5) The estimated cost of implementing the Kalgoorlie initiatives in participating metropolitan Perth properties is $90million.
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