Bureau Home » Water Information » National Water Account » 2019 Account » Perth » Water Accounting Statements » Water Flows

National Water Account 2019

Perth: Statement of Water Flows

for the year ended 30 June 2019

The volume of water in the region's storages increased during 2018–19 for the third successive year.
This increase represents the change in water volume in the region's surface water storages.

The Statement of Water Flows is provided below and presents the actual water flows associated with the region's water stores during the year, including flows corresponding to the accrual transactions shown in the Statement of Changes in Water Assets and Water Liabilities.

Expand all Collapse all

Select comparative year

	2019 ML	2018 ML	2017 ML	2016 ML	2015 ML	2014 ML
Water inflows
Surface water inflows	1,556,367	1,374,944	1,782,956	778,502	937,289	1,154,779
Precipitation	56,014	55,877	37,453	16,824	21,238	25,009
Runoff	938,880	749,192	840,406	352,148	549,983	787,143
Inter-region inflow	173,882	132,914	444,083	69,756	–	–
Flood return	710	10,674	19,919	–	–	–
Discharge: groundwater*	350,701	339,369	339,166	256,534	291,896	283,158
Discharge: urban supply*	33,797	84,496	99,858	**81,104	**72,130	**56,936
Riparian release: urban supply*	2,383	2,422	2,071	**2,136	**2,042	**2,533

Groundwater inflows	1,688,739	1,780,134	1,637,715	1,236,022	1,372,693	2,013,987
Inter-region inflow	48,562	45,775	45,724	47,475	45,218	52,788
Inter-region coastal inflow	0	0	0	0	0	0
Recharge: landscape	1,611,117	1,701,602	1,567,101	1,165,106	1,304,530	1,937,932
Leakage: urban system*	24,130	24,270	23,431	21,873	21,155	21,005
Managed aquifer recharge*	4,930	8,487	1,459	1,568	**1,790	**2,262

Urban water system inflows	463,014	509,463	523,067	517,538	503,927	487,054
Wastewater collected	141,684	141,185	140,439	138,858	140,771	141,024
Supply system delivery: inter-region	1,906	1,795	1,832	1,953	1,922	2,121
Delivery: desalinated water	89,295	148,904	149,872	138,645	119,457	113,060
Allocated diversions: surface water*	107,811	85,631	91,326	101,204	119,649	105,998
Allocated extractions: groundwater*	122,318	131,948	139,598	136,878	122,128	124,851

Irrigation scheme inflows	74,809	72,969	59,277	69,094	66,060	73,851
Allocated diversion: surface water*	74,809	72,969	59,277	69,094	66,060	73,851
Total water inflows	3,782,929	3,737,510	4,003,015	2,601,156	2,879,969	3,729,671
Water outflows
Surface water outflows	1,815,011	1,618,782	1,750,059	434,482	651,497	802,896
Evaporation	73,604	57,417	48,591	28,912	46,052	33,600
Outflow	1,287,580	1,185,613	1,221,652	196,413	380,925	555,390
Leakage: landscape	150	150	150	150	150	196
River losses	144,767	114,471	238,759	–	–	–
Overbank flow	82,691	64,368	51,454	–	–	–
Allocated diversion: urban system*	107,811	85,631	91,326	101,204	119,649	105,998
Allocated diversion: irrigation scheme*	74,809	72,969	59,277	69,094	66,060	73,851
Allocation diversion: individual users	43,599	38,163	38,850	38,709	38,661	33,861

Groundwater outflows	1,676,360	1,585,031	1,521,160	1,361,781	1,473,885	1,767,928
Inter-region outflow	22,933	19,523	19,350	21,863	23,439	30,164
Inter-region coastal outflow	306,565	290,714	261,169	**233,290	**261,245	**352,251
Discharge: landscape	480,437	422,166	389,247	332,617	378,114	622,737
Discharge: surface water*	350,701	339,369	339,166	256,534	291,896	283,158
Non-allocated extraction: individual users	82,881	81,791	81,256	80,845	79,610	73,249
Allocated extraction: urban system*	122,318	131,948	139,568	136,878	122,128	124,851
Allocation extraction: individual users	310,525	299,520	291,374	299,754	281,453	281,518

Urban water system outflows	454,577	501,755	514,501	517,992	503,488	487,088
Supply system delivery: urban users	228,344	227,634	224,799	263,200	232,537	234,774
Recycled water delivery: urban users	6,856	4,698	8,622	9,095	8,035	8,203
Discharge: sea	123,224	118,202	119,190	123,163	125,025	124,900
Discharge: landscape	4,656	4,465	5,734	6,145	5,962	5,673
Supply system transfer: inter-region	17,713	18,563	20,883	27,923	24,796	20,797
Other supply system decreases	8,544	8,518	8,454	8,785	10,016	10,005
Leakage: groundwater*	24,130	24,270	23,431	21,873	21,155	21,005
Supply system discharge: reservoirs*	33,797	84,496	99,858	**81,104	**72,130	**56,936
Supply system discharge: riparian release*	2,383	2,422	2,071	**2,136	**2,042	**2,533
Managed aquifer recharge*	4,930	8,487	1,459	1,568	**1,790	**2,262

Irrigation scheme outflows	73,953	74,297	59,377	70,657	64,528	73,007
Delivery	52,777	54,059	43,456	**53,456	**52,397	**56,310
Leakage: landscape	21,176	20,238	15,921	**17,201	**12,131	**16,697

Total water outflows	4,019,901	3,779,865	3,845,097	2,384,912	2,657,398	3,130,919

Unaccounted-for difference	262,162	135,061	**(122,914)	**(288,556)	**(232,852)	**(519,071)


Water storage
Surface water storage	415,416	390,226	297,520	262,516	334,828	345,109
Opening surface water storage	390,226	297,520	262,516	334,828	345,109	256,428
Change in surface water storage	25,190	92,706	35,004	(72,312)	(10,281)	88,681
Closing surface water storage	415,416	390,226	297,520	262,516	334,828	345,109

Groundwater storage	–	–	–	–	–	–
Opening groundwater storage	–	–	–	–	–	–
Change in groundwater storage	–	–	–	–	–	–
Closing groundwater storage	–	–	–	–	–	–
Total closing water storage	415,416	390,226	297,520	262,516	334,828	345,109

* between-store flows

** different to published volume in historical accounts (see Governance section for more information)

National Water Account 2019

Menu

Key findings

Climate and water

Water Accounting Statements

Water Assets and Water Liabilities

Changes in Water Assets and Water Liabilities

Water Flows

Supporting information

Statement details

Water stores

Water access and use

Outlook

Data request

Region description

Geographic information

Water management

Water rights

Reference information

Governance

Methods

References

Perth: Statement of Water Flows

for the year ended 30 June 2019

Graphical Views