Figure 1 and tables 1–5 summarise the water distribution for Yarra Valley Water for 2009–10. The tables provide a breakdown for values shown in Figure 1. Notes for the values provided in tables 1–5 are available after Table 5.
Figure 1. Urban note – summary of Yarra Valley Water*
*All volumes are in megalitres (ML)
Differences between the urban water distribution system components are attributed to unaccounted water losses, and limitations in the calculations of volumes sourced, treated and supplied for consumption and other uses.
Note 1: Direct comparison of the total volume of water supplied (via the urban water supply system and the recycled water supply system) and the total volume of wastewater generated is not feasible due to data limitations on:
Note 2: Part of the wastewater collected is treated by Melbourne Water.
Note 3: Total water usage (116,846 ML) is estimated as: (1) volume of water supplied via the urban water supply system (excluding nonrevenue water) (116,130 ML) plus (2) volume ofwater supplied via the recycled water supply system (716 ML).
Note 4: (1) Volume of wastewater treated by Yarra Valley Water (8,897 ML); (2) volume of effluent discharge (6,250 ML) + volume of recycled water produced (2,639 ML) = 8,889 ML.The difference between (1) and (2) is likely to be due to differences in metering accuracies and unaccounted losses.
Note 5: Volume of recycled water produced (2,639 ML) = recycled water used on-site in-process (1,923 ML)+ recycled water for supplies (716 ML).
| Sources of water | Volume (ML) | Note | |
|---|---|---|---|
| Delivered via the water supply system (connected areas) | Water sourced from external entity (Melbourne Water) |
132,772 |
YVW_U4+ YVW_U5 |
| Water sourced from surface water |
0 |
||
| Water sourced from groundwater |
0 |
||
| Water sourced from desalination |
0 |
||
| Water sourced from recycling |
See Table 4 |
||
| Total water sourced to supply connected areas |
132,772 |
||
| Directly abstracted water * | Water sourced from surface water |
– |
|
| Water sourced from groundwater |
– |
||
| Water sourced from farm dam |
– |
||
| Water sourced from rainwater tank |
– |
||
| Total water directly sourced |
– |
||
| Total water sourced(excluding recycled water) |
132,772 |
||
|
Item |
Water usage |
Volume (ML) |
Note |
|---|---|---|---|
|
1 |
Residential – potable water |
90,959 |
YVW_U9 |
|
2 |
55 |
YVW_U12 |
|
|
3 |
Commercial, industrial, municipal – potable water |
24,799 |
YVW_U10 |
|
4 |
Commercial, industrial, municipal – non-potable water |
317 |
YVW_U13 |
|
5 |
Other including agricultural – potable water |
0 |
|
|
6 |
Agricultural – non-potable water |
0 |
|
|
7 |
Environment – potable water |
0 |
|
|
8 |
Environment – non-potable water |
0 |
|
|
|
Total water use via urban water supply system |
116,130 |
Items 1 +2+ |
|
Item |
Wastewater produced and treated |
Volume (ML) |
Note |
|---|---|---|---|
|
1 |
Wastewater collected by Yarra Valley Water |
118,042 |
YVW_U19a |
|
2 |
Wastewater received from other water authorities within the region |
0 |
|
|
3 |
Wastewater delivered to Melbourne Water |
109,145 |
Item 1 – item 3; YVW_U21 |
|
4 |
Total wastewater treated |
8,897 |
YVW_U19b |
|
5 |
Wastewater treated for recycling |
2,639 |
YVW_U30 |
|
6 |
Wastewater (treated) discharged to surface water |
6,250 |
YVW_U22 |
|
7 |
Wastewater (treated) discharged to ocean |
0 |
|
|
8 |
Total treated wastewater discharged |
6,250 |
Items 6 + 7 |
|
Item |
Recycled water produced and supplied |
Volume (ML) |
Note |
|---|---|---|---|
|
1 |
Total recycled water produced |
2,639 |
YVW_U30 |
|
2 |
Total recycled water received from other organisations within the region |
0 |
|
|
3 |
Recycled water use on-site in-process use |
1,923 |
YVW_U34 |
|
4 |
Recycled water supplied to residential |
21 |
YVW_U31 |
|
5 |
Recycled water supplied to commercial, industrial, municipal |
446 |
YVW_U32 |
|
6 |
Recycled water supplied to agricultural |
249 |
YVW_U33 |
|
7 |
Recycled water supplied to environment |
0 |
|
|
8 |
Recycled water supplied to artificial recharge |
0 |
|
|
9 |
Total recycled water supplied |
716 |
Items 4+5+6 |
|
Losses |
Volume (ML) |
Note |
|---|---|---|
|
Losses from potable, non-potable water supplies* |
16,642 |
YVW_U11 |
|
Losses from recycled water supplies |
– |
|
|
Total water losses |
16,642 |
|
YVW_U4: 132,400 ML
Yarra Valley Water: database (daily and weekly volumes are recorded in various spreadsheets).
Yarra Valley Water.
This item represents the metered volume of bulk water supplied by Melbourne Water. Meters are located around the boundaries of Yarra Valley Water’s area and at Silvan, Greenvale and Yan Yean reservoirs. Meters are read daily. Metered volumes are based on Melbourne Water bulk meters. The line item is calculated as (incoming volumes to Yarra Valley Water) – (outgoing volumes metered at South East Water and City West Water boundaries).
+/–5%.
Nil.
YVW_U5: 372 ML
Yarra Valley Water: customer meter database.
Yarra Valley Water.
This item represents the metered volume of unchlorinated water taken directly from Melbourne Water’s Maroondah aqueduct to supply customers who have unchlorinated water service agreements. Meters are located at customer premises and are read quarterly.
|
Non-potable water received |
Volume (ML) |
|---|---|
|
Volume of water taken from Maroondah aqueduct to provide customers who have unchlorinated water service agreements for residential use (U12) |
55 |
|
Volume of water taken from Maroondah aqueduct to provide customers who have unchlorinated water service agreements for commercial, industrial and municipal uses (U13) |
317 |
|
Total |
372 |
+/–5%.
The four quarterly billed volumes are assumed to estimate the volume used in the National Water Account 2010’s reporting period (i.e. 01 July 2009 – 30 June 2010).
YVW_U9: 90,959 ML
Yarra Valley Water: quarterly billing database containing customer metered volumes.
Yarra Valley Water.
The item represents the metered volume of potable water supplied for residential use.
Customer usage is calculated as the difference between total water received and estimated nonrevenue water volume, and is then divided into residential and nonresidential components in the same ratio as the customer-billed volumes.
+/–5%.
The two key assumptions are:
and
YVW_U10: 24,799 ML
Yarra Valley Water: quarterly billing database.
Yarra Valley Water.
The item represents the metered volume of potable water supplied for commercial, industrial and municipal use.
Customer usage is calculated as the difference between total water received and estimated nonrevenue water volume, and is then divided into residential and nonresidential components in the same ratio as customer-billed volumes.
+/–5%.
Nil.
YVW_U11: 16,642 ML
Not applicable.
Yarra Valley Water.
This item represents the volume of nonrevenue water. Nonrevenue water is estimated by subtracting customer usage from daily volumes received from the bulk supplier. Customer usage is estimated from billing data by allocating quarterly billed volumes over the days that are covered by the billing period for each customer. Daily estimates of nonrevenue water are then aggregated for the year.
Nonrevenue water is estimated by back-allocating each customer’s billed volumes into the period of use, aggregating the volumes for all customers from 01 July to 30 June, and then determining the difference of the total water received. That is, for each day in the reporting period, an estimate of customer usage is subtracted from the total bulk water received on that day to arrive at the estimated level of nonrevenue water.
+/–10%.
Nil.
YVW_U12: 55 ML
Yarra Valley Water: quarterly billing database.
Yarra Valley Water.
This item represents the metered volume of water provided to residential customers who have unchlorinated water service agreements.
+/–5%.
It is assumed that the metered billed volume each year represents an acceptable estimate of the volume used in that year.
YVW_U13: 317 ML
Yarra Valley Water: quarterly billing database.
Yarra Valley Water.
This item represents the volume of water provided to nonresidential customers who have unchlorinated water service agreements.
+/–5%.
It is assumed that the metered billed volume each year represents an acceptable estimate of volume used in that year.
YVW_U15: 10,554 ML
Yarra Valley Water: 2009–10 potable water balance.
Yarra Valley Water.
This item represents the leakage subcomponent of nonrevenue water. Background leakage and losses included are calculated as the total volume of nonrevenue water minus the sum of all other subcomponents of nonrevenue water.
Nonrevenue water consists of the following subcomponents:
Subcomponent volumes are estimated using a wide range of approaches.
+/–20%.
Nil.
YVW_U17: 1,879 ML
Yarra Valley Water: 2009–10 potable water balance.
Yarra Valley Water.
This item represents the losses from pipe bursts subcomponent of nonrevenue water. Background leakage and losses are calculated as the total volume of nonrevenue water minus the sum of all other subcomponents of nonrevenue water.
Nonrevenue water consists of the following subcomponents:
Subcomponent volumes are estimated using a wide range of approaches.
+/–20%.
Nil.
YVW_U19a: 118,042 ML
‘Sewflow.mdb’ for flows to Melbourne Water plants and ‘LTPFLOW.xls’ for flows to Yarra Valley Water local treatment plants.
Yarra Valley Water.
This item represents the metered volume of wastewater collected and treated at Yarra Valley Water’s local treatment plants, plus the metered volume of wastewater exported to Melbourne Water’s Eastern and Western treatment plants.
|
Wastewater collected |
Volume (ML) |
|---|---|
|
Wastewater collected and treated at Yarra Valley Water’s local treatment plants |
8,897 |
|
Wastewater collected and exported to Melbourne Water’s Western Treatment Plant |
67,062 |
|
Wastewater collected and exported to Melbourne Water’s Eastern Treatment Plant |
42,083 |
|
Total |
118,042 |
+/–10%.
Volumes exported to the Eastern and Western treatment plants are based on agreed formulas. Specific proportions of flows at various bulk meters are allocated to Yarra Valley Water (and remaining proportions to either South East Water or City West Water).
YVW_U19b: 8,897 ML
Not applicable.
Yarra Valley Water.
This item represents the metered volume of wastewater treated at Yarra Valley Water local treatment plants. Meters at the plants are read daily.
|
Local treatment plant |
Volume (ML) |
|---|---|
|
Brushy Creek |
3,734 |
|
Craigieburn |
863 |
|
Healesville |
403 |
|
Upper Yarra |
729 |
|
Lilydale |
2,132 |
|
Monbulk |
19 |
|
Whittlesea |
223 |
|
Aurora |
339 |
|
Wallan |
455 |
|
Total |
8,897 |
+/–10%.
Nil.
YVW_U21: 109,145 ML
Not applicable.
Yarra Valley Water.
This item represents the metered volume of wastewater exported to Melbourne Water’s Eastern and Western treatment plants. Melbourne Water’s bulk sewer meters are positioned around Yarra Valley Water’s common border with South East Water and City West Water, as well as at the two major treatment plants. Yarra Valley Water receives only weekly invoiced volumes; however, meters may be read more frequently (e.g. daily). Daily volumes are not reported to Yarra Valley Water by Melbourne Water.
|
Wastewater collected |
Volume (ML) |
|---|---|
|
Wastewater collected and exported to Melbourne Water’s Western Treatment Plant |
67,062 |
|
Wastewater collected and exported to Melbourne Water’s Eastern Treatment Plant |
42,083 |
|
Total |
109,145 |
+/–10%.
Nil.
YVW_U22: 6,250 ML
Not applicable.
Yarra Valley Water.
This item represents the metered volume of treated wastewater discharged from Yarra Valley Water local treatment plants to surface water. Meters at local treatment plants are read daily.
|
Local treatment plant (LTP) wastewater discharged to surface water |
Volume (ML) |
|---|---|
|
Brushy Creek LTP to Brushy Creek |
3,302 |
|
Craigieburn LTP to Merri Creek |
265 |
|
Healesville LTP to Yarra River |
231 |
|
Upper Yarra LTP to Yarra River |
673 |
|
Lilydale LTP to Olinda Creek |
1,760 |
|
Monbulk LTP to Sassafras Creek |
19 |
|
Total discharge |
6,250 |
+/–5%.
Nil.
YVW_U21: 17 ML
Not applicable.
Yarra Valley Water.
This item represents the estimated volume of overflows from Yarra Valley Water emergency relief structures into stormwater.
The volume is estimated by using a mosaic ERS data processor, which calculates spill duration and volume based on supervisory control and data acquisition (SCADA) monitoring data. SCADA is a real-time monitoring system.
Ungraded.
Nil.
YVW_U21: 8,636 ML
Not applicable.
Yarra Valley Water.
This item represents the estimated volume of stormwater that enters the wastewater system.
The volume is calculated as:
Dry weather flow is estimated as the average weekly sewer flow during weeks where less than 5 mm rainfall has occurred (aggregated to a full year).
+/–20%.
The estimate of water entering the sewer system cannot distinguish between flows that result from stormwater and flows that result from groundwater. The estimate provided here represents both.
YVW_U30: 2,639 ML
Yarra Valley Water: database
Yarra Valley Water.
This item represents the metered volume of recycled water produced at Yarra Valley Water local treatment plants (the sum of U31, U32, U33 and U34).
|
Recycled water produced |
Volume (ML) |
|---|---|
|
U31 Recycled water supplied for residential use |
21 |
|
U32 Recycled water supplied for commercial, industrial and municipal uses |
446 |
|
U33 Recycled water supplied other than for residential, commercial, municipal and industrial uses |
249 |
|
U34 Recycled water used on-site or on-site in-process |
1,923 |
|
Total |
2,639 |
+/–5%.
Nil.
YVW_U31: 21 ML
Yarra Valley Water: customer meter quarterly billing database.
Yarra Valley Water.
This item represents the metered volume of recycled water supplied to the Aurora recycled water development scheme for residential use.
+/–5%.
It is assumed that billed volumes over the four quarters provide an adequate estimate of water used in the reporting period.
YVW_U32: 446 ML
Not applicable.
Yarra Valley Water.
This item represents the metered volume of recycled water supplied for commercial, industrial and municipal use.
|
Item |
Recycled water supplied for commercial, industrial and municipal use |
Volume (ML) |
Notes
|
|---|---|---|---|
|
1 |
Total urban and industrial effluent reuse |
467 |
|
|
2 |
Recycled water supplied for residential use (U31) |
21 |
|
|
3 |
Recycled water supplied for commercial, industrial and municipal use(U32) |
446 |
Item 1 – item 2 |
+/–5%.
Nil.
YVW_U33: 249 ML
Not applicable.
Yarra Valley Water.
This item represents the metered volume of recycled water supplied from the Wallan Local Treatment Plant for agricultural use.
+/–5%.
Nil.
YVW_U34: 1,923 ML
Not applicable.
Yarra Valley Water.
This item represents the metered volume of recycled water used for in-process water at Yarra Valley Water’s local treatment plants.
|
Local treatment plant |
Volume (ML) |
|---|---|
|
Brushy Creek |
791 |
|
Craigieburn |
155 |
|
Healesville |
93 |
|
Upper Yarra |
196 |
|
Lilydale |
528 |
|
Whittlesea |
25 |
|
Aurora |
137 |
|
Total recycling water used in-process |
1,923 |
+/–5%.
Nil.
National Water Account 2010
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