❓ A WA parliamentary question on notice regarding the accuracy of 2000 water resource assessments in the South West and Perth Basin, and the current estimates for water availability and allocation. The Minister acknowledges updates but indicates overall estimates remain largely unchanged.
AnsweredQoN 2170Legislative Council
QuestionView source ↗
I refer the Minister to the Water Resources Assessment undertaken in 2000, which formed the basis of the national water assessment, and ask -
(1) Has subsequent research changed the 2000 estimates?
(2) If so, what are the latest estimates for -
(a) annual surface water recharge in the South West;
(b) annual sustainable surface water resources in the South West available for allocation;
(c) annual unallocated sustainable surface water resources in the South West;
(d) annual ground water recharge in the Perth basin;
(e) total volume of ground water resources in the Perth Basin; and
(f) unallocated sustainable ground water resources in the Perth Basin?
(1) Has subsequent research changed the 2000 estimates?
(2) If so, what are the latest estimates for -
(a) annual surface water recharge in the South West;
(b) annual sustainable surface water resources in the South West available for allocation;
(c) annual unallocated sustainable surface water resources in the South West;
(d) annual ground water recharge in the Perth basin;
(e) total volume of ground water resources in the Perth Basin; and
(f) unallocated sustainable ground water resources in the Perth Basin?
AnswerView source ↗
Answered
26 August 2004
Responded by
Minister for Local Government and Regional Development representing the Minister for the Environment
Response time
56 days
(b) annual sustainable surface water resources in the South West available for allocation; (c) annual unallocated sustainable surface water resources in the South West; (d) annual ground water recharge in the Perth basin; (e) total volume of ground water resources in the Perth Basin; and (f) unallocated sustainable ground water resources in the Perth Basin?
(c) annual unallocated sustainable surface water resources in the South West; (d) annual ground water recharge in the Perth basin; (e) total volume of ground water resources in the Perth Basin; and (f) unallocated sustainable ground water resources in the Perth Basin?
(d) annual ground water recharge in the Perth basin; (e) total volume of ground water resources in the Perth Basin; and (f) unallocated sustainable ground water resources in the Perth Basin?
(e) total volume of ground water resources in the Perth Basin; and (f) unallocated sustainable ground water resources in the Perth Basin?
(f) unallocated sustainable ground water resources in the Perth Basin?
(1) The National Land and Water Resources Audit: Water Resources Assessment 2000 report, represents the most comprehensive work undertaken for water resources in WA to date. The water resource information contained in the Water Resources Assessment 2000 were based on 1997?1999 data. There has been no subsequent research to update the surface water estimates to the scale of the Water Resources Assessment, however, subsequent work has been carried out in the Harvey, Waroona and Collie Irrigation Systems and work is currently in progress on the Cape to Cape region in the south west of the State. Subsequent work has also been carried out to review and update all of the groundwater data in the State. The estimated allocation limits for all the fractured rock aquifers have been reviewed. Estimated allocation limits for all sedimentary aquifers outside the Perth Basin have been reviewed. Within the Perth Basin, the estimated allocation limits for almost all the groundwater areas have been reviewed and additional work is currently being carried out in the Blackwood, Busselton-Capel, Bunbury and Gnangara Mound Groundwater Areas to update the estimated allocation limits. (2a) I assume with surface water recharge, the Hon Member is referring to the surface water mean annual flow. The local work undertaken in the Harvey, Waroona and Collie Irrigation Systems has changed some of the local flow parameters but has not changed the overall estimates of surface water mean annual flow from the Water Resource Assessment 2000 which in the South West Drainage Division, remains at 6,785 GL/yr. However, this does not mean that all of this is available for consumptive use. This figure represents the total water in the system. From that, a large proportion is required to maintain the environmental and social values or has poor water quality. The actual amount of fresh to marginal water available for allocation for consumptive use is a small proportion of this volume. (b) The latest estimates of the total sustainable fresh to marginal surface water resources that are available for allocation have not substantially changed from the Water Resource Assessment 2000. In the South West Drainage Division the current estimate is 1,315 GL/yr. Of this figure, 574 GL/yr is currently licensed. (c) The estimated unallocated sustainable fresh to marginal surface water resources in the South West Drainage Division is 741 GL/yr distributed amongst 19 river basins spread between Esperance in the south to the Moore-Hill Rivers Basin in the north. The volume of fresh water is less than 741 GL/yr. (d) The Perth Basin extends from north east of Geraldton to south east of Augusta. It is subdivided into 20 Groundwater Areas containing 167 subareas which are further subdivided into 521 groundwater resources against which groundwater can be allocated through water licences. The total estimates for groundwater recharge are based on both recent work and on the Water Resources Assessment 2000 report and are summarised as follows: · Confined aquifers ? 829 GL/yr · Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
(2a) I assume with surface water recharge, the Hon Member is referring to the surface water mean annual flow. The local work undertaken in the Harvey, Waroona and Collie Irrigation Systems has changed some of the local flow parameters but has not changed the overall estimates of surface water mean annual flow from the Water Resource Assessment 2000 which in the South West Drainage Division, remains at 6,785 GL/yr. However, this does not mean that all of this is available for consumptive use. This figure represents the total water in the system. From that, a large proportion is required to maintain the environmental and social values or has poor water quality. The actual amount of fresh to marginal water available for allocation for consumptive use is a small proportion of this volume. (b) The latest estimates of the total sustainable fresh to marginal surface water resources that are available for allocation have not substantially changed from the Water Resource Assessment 2000. In the South West Drainage Division the current estimate is 1,315 GL/yr. Of this figure, 574 GL/yr is currently licensed. (c) The estimated unallocated sustainable fresh to marginal surface water resources in the South West Drainage Division is 741 GL/yr distributed amongst 19 river basins spread between Esperance in the south to the Moore-Hill Rivers Basin in the north. The volume of fresh water is less than 741 GL/yr. (d) The Perth Basin extends from north east of Geraldton to south east of Augusta. It is subdivided into 20 Groundwater Areas containing 167 subareas which are further subdivided into 521 groundwater resources against which groundwater can be allocated through water licences. The total estimates for groundwater recharge are based on both recent work and on the Water Resources Assessment 2000 report and are summarised as follows: · Confined aquifers ? 829 GL/yr · Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
(b) The latest estimates of the total sustainable fresh to marginal surface water resources that are available for allocation have not substantially changed from the Water Resource Assessment 2000. In the South West Drainage Division the current estimate is 1,315 GL/yr. Of this figure, 574 GL/yr is currently licensed. (c) The estimated unallocated sustainable fresh to marginal surface water resources in the South West Drainage Division is 741 GL/yr distributed amongst 19 river basins spread between Esperance in the south to the Moore-Hill Rivers Basin in the north. The volume of fresh water is less than 741 GL/yr. (d) The Perth Basin extends from north east of Geraldton to south east of Augusta. It is subdivided into 20 Groundwater Areas containing 167 subareas which are further subdivided into 521 groundwater resources against which groundwater can be allocated through water licences. The total estimates for groundwater recharge are based on both recent work and on the Water Resources Assessment 2000 report and are summarised as follows: · Confined aquifers ? 829 GL/yr · Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
(c) The estimated unallocated sustainable fresh to marginal surface water resources in the South West Drainage Division is 741 GL/yr distributed amongst 19 river basins spread between Esperance in the south to the Moore-Hill Rivers Basin in the north. The volume of fresh water is less than 741 GL/yr. (d) The Perth Basin extends from north east of Geraldton to south east of Augusta. It is subdivided into 20 Groundwater Areas containing 167 subareas which are further subdivided into 521 groundwater resources against which groundwater can be allocated through water licences. The total estimates for groundwater recharge are based on both recent work and on the Water Resources Assessment 2000 report and are summarised as follows: · Confined aquifers ? 829 GL/yr · Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
(d) The Perth Basin extends from north east of Geraldton to south east of Augusta. It is subdivided into 20 Groundwater Areas containing 167 subareas which are further subdivided into 521 groundwater resources against which groundwater can be allocated through water licences. The total estimates for groundwater recharge are based on both recent work and on the Water Resources Assessment 2000 report and are summarised as follows: · Confined aquifers ? 829 GL/yr · Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
The total estimates for groundwater recharge are based on both recent work and on the Water Resources Assessment 2000 report and are summarised as follows: · Confined aquifers ? 829 GL/yr · Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· Confined aquifers ? 829 GL/yr · Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
(e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
(f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
(c) annual unallocated sustainable surface water resources in the South West; (d) annual ground water recharge in the Perth basin; (e) total volume of ground water resources in the Perth Basin; and (f) unallocated sustainable ground water resources in the Perth Basin?
(d) annual ground water recharge in the Perth basin; (e) total volume of ground water resources in the Perth Basin; and (f) unallocated sustainable ground water resources in the Perth Basin?
(e) total volume of ground water resources in the Perth Basin; and (f) unallocated sustainable ground water resources in the Perth Basin?
(f) unallocated sustainable ground water resources in the Perth Basin?
(1) The National Land and Water Resources Audit: Water Resources Assessment 2000 report, represents the most comprehensive work undertaken for water resources in WA to date. The water resource information contained in the Water Resources Assessment 2000 were based on 1997?1999 data. There has been no subsequent research to update the surface water estimates to the scale of the Water Resources Assessment, however, subsequent work has been carried out in the Harvey, Waroona and Collie Irrigation Systems and work is currently in progress on the Cape to Cape region in the south west of the State. Subsequent work has also been carried out to review and update all of the groundwater data in the State. The estimated allocation limits for all the fractured rock aquifers have been reviewed. Estimated allocation limits for all sedimentary aquifers outside the Perth Basin have been reviewed. Within the Perth Basin, the estimated allocation limits for almost all the groundwater areas have been reviewed and additional work is currently being carried out in the Blackwood, Busselton-Capel, Bunbury and Gnangara Mound Groundwater Areas to update the estimated allocation limits. (2a) I assume with surface water recharge, the Hon Member is referring to the surface water mean annual flow. The local work undertaken in the Harvey, Waroona and Collie Irrigation Systems has changed some of the local flow parameters but has not changed the overall estimates of surface water mean annual flow from the Water Resource Assessment 2000 which in the South West Drainage Division, remains at 6,785 GL/yr. However, this does not mean that all of this is available for consumptive use. This figure represents the total water in the system. From that, a large proportion is required to maintain the environmental and social values or has poor water quality. The actual amount of fresh to marginal water available for allocation for consumptive use is a small proportion of this volume. (b) The latest estimates of the total sustainable fresh to marginal surface water resources that are available for allocation have not substantially changed from the Water Resource Assessment 2000. In the South West Drainage Division the current estimate is 1,315 GL/yr. Of this figure, 574 GL/yr is currently licensed. (c) The estimated unallocated sustainable fresh to marginal surface water resources in the South West Drainage Division is 741 GL/yr distributed amongst 19 river basins spread between Esperance in the south to the Moore-Hill Rivers Basin in the north. The volume of fresh water is less than 741 GL/yr. (d) The Perth Basin extends from north east of Geraldton to south east of Augusta. It is subdivided into 20 Groundwater Areas containing 167 subareas which are further subdivided into 521 groundwater resources against which groundwater can be allocated through water licences. The total estimates for groundwater recharge are based on both recent work and on the Water Resources Assessment 2000 report and are summarised as follows: · Confined aquifers ? 829 GL/yr · Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
(2a) I assume with surface water recharge, the Hon Member is referring to the surface water mean annual flow. The local work undertaken in the Harvey, Waroona and Collie Irrigation Systems has changed some of the local flow parameters but has not changed the overall estimates of surface water mean annual flow from the Water Resource Assessment 2000 which in the South West Drainage Division, remains at 6,785 GL/yr. However, this does not mean that all of this is available for consumptive use. This figure represents the total water in the system. From that, a large proportion is required to maintain the environmental and social values or has poor water quality. The actual amount of fresh to marginal water available for allocation for consumptive use is a small proportion of this volume. (b) The latest estimates of the total sustainable fresh to marginal surface water resources that are available for allocation have not substantially changed from the Water Resource Assessment 2000. In the South West Drainage Division the current estimate is 1,315 GL/yr. Of this figure, 574 GL/yr is currently licensed. (c) The estimated unallocated sustainable fresh to marginal surface water resources in the South West Drainage Division is 741 GL/yr distributed amongst 19 river basins spread between Esperance in the south to the Moore-Hill Rivers Basin in the north. The volume of fresh water is less than 741 GL/yr. (d) The Perth Basin extends from north east of Geraldton to south east of Augusta. It is subdivided into 20 Groundwater Areas containing 167 subareas which are further subdivided into 521 groundwater resources against which groundwater can be allocated through water licences. The total estimates for groundwater recharge are based on both recent work and on the Water Resources Assessment 2000 report and are summarised as follows: · Confined aquifers ? 829 GL/yr · Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
(b) The latest estimates of the total sustainable fresh to marginal surface water resources that are available for allocation have not substantially changed from the Water Resource Assessment 2000. In the South West Drainage Division the current estimate is 1,315 GL/yr. Of this figure, 574 GL/yr is currently licensed. (c) The estimated unallocated sustainable fresh to marginal surface water resources in the South West Drainage Division is 741 GL/yr distributed amongst 19 river basins spread between Esperance in the south to the Moore-Hill Rivers Basin in the north. The volume of fresh water is less than 741 GL/yr. (d) The Perth Basin extends from north east of Geraldton to south east of Augusta. It is subdivided into 20 Groundwater Areas containing 167 subareas which are further subdivided into 521 groundwater resources against which groundwater can be allocated through water licences. The total estimates for groundwater recharge are based on both recent work and on the Water Resources Assessment 2000 report and are summarised as follows: · Confined aquifers ? 829 GL/yr · Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
(c) The estimated unallocated sustainable fresh to marginal surface water resources in the South West Drainage Division is 741 GL/yr distributed amongst 19 river basins spread between Esperance in the south to the Moore-Hill Rivers Basin in the north. The volume of fresh water is less than 741 GL/yr. (d) The Perth Basin extends from north east of Geraldton to south east of Augusta. It is subdivided into 20 Groundwater Areas containing 167 subareas which are further subdivided into 521 groundwater resources against which groundwater can be allocated through water licences. The total estimates for groundwater recharge are based on both recent work and on the Water Resources Assessment 2000 report and are summarised as follows: · Confined aquifers ? 829 GL/yr · Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
(d) The Perth Basin extends from north east of Geraldton to south east of Augusta. It is subdivided into 20 Groundwater Areas containing 167 subareas which are further subdivided into 521 groundwater resources against which groundwater can be allocated through water licences. The total estimates for groundwater recharge are based on both recent work and on the Water Resources Assessment 2000 report and are summarised as follows: · Confined aquifers ? 829 GL/yr · Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
The total estimates for groundwater recharge are based on both recent work and on the Water Resources Assessment 2000 report and are summarised as follows: · Confined aquifers ? 829 GL/yr · Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· Confined aquifers ? 829 GL/yr · Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· Unconfined aquifers ? 1,546 GL/yr · Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· Whole of the Perth Basin ? 2,375 GL/yr However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
However, to date, direct measurements of recharge have been carried out only on the Gnangara Mound near Perth and are currently being carried out in the Blackwood Groundwater Area in the southern Perth basin. Elsewhere in the State, conservative estimates have been made. (e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
(e) The Perth Basin contains Western Australia?s largest renewable groundwater resources. If the Hon Member is referring to the total volume of groundwater stored in the Perth Basin, this figure has not been accurately determined. However, if the Member is referring to the total volume expressed as an annual Allocation Limit, it is approximately 948 GL/yr in the unconfined aquifers and 510 GL/yr in the confined aquifers, or a total of 1,458 GL/yr. (f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
(f) Based on the Water Licensing System records, the unallocated groundwater resources at the scale of the Perth Basin are: · approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· approximately 490 GL/yr, or 51% of the allocation limit in the unconfined aquifers; and · approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· approximately 230 GL/yr or 44% of the allocation limit in the confined aquifers. · In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· In total, the unallocated groundwater resources in the Perth Basin are approximately 720 GL/yr or 49% of the combined Allocation Limit. · These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· These figures however, are spread over 167 subareas and 521 groundwater resources located between Geraldton and Augusta and no assessment has been made of the proportion of this water that can be economically abstracted. · To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
· To avoid unacceptable environmental impacts at the local level, groundwater management in Western Australia is carried out at the subarea scale and hence care should be taken when reviewing such statistics at the larger scales.
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