Groundwater Source Update Department of Planning, Industry & - PowerPoint PPT Presentation

MURRAY PUBLIC EXHIBITION | MURRAY ALLUVIUM WATER RESOURCE PLAN Groundwater Source Update Department of Planning, Industry & Environment | Water – July 2019

Groundwater sources of the Murray Alluvium water resource plan Page 2

Lower Murray Cross Sectional Map Page 3

Cross Section A Swan Hill to near Corowa Page 4

Cross Section B Echuca to Jerilderie Page 5

Existing Access Licenses & Extraction Limit – Lower Murray Deep Access License Number of Licenses Share Component Category Aquifer 345 84,710 Local Water Utility/Town Water 4 79 Supply Existing extraction limit: 83,700 ML/year Existing extraction limit including BLR: 85,225 ML/year Page 6

Existing Access Licenses & Extraction Limit – Lower Murray Shallow Access License Number of Licenses Share Component Category Aquifer 258 57,653 Local Water Utility/Town Water 2 87 Supply Salinity and Watertable 2 20,010 Management Existing extraction limit including BLR: 81,893 ML/year Page 7

Groundwater Trading – Lower Murray Deep Share Component assignment Allocation assignment dealings (71T) dealings(71Q) Year number volume (ML) number volume (ML) 2015-16 207 35,055 5 1,011 2016-17 68 14,748 11 2,650 2017-18 149 29,782 4 798 Groundwater Trading – Lower Murray Shallow Share Component assignment Allocation assignment dealings (71T) Year dealings(71Q) number volume (ML) number volume (ML) 2015-16 0 0 0 0 2016-17 1 360 0 0 2017-18 1 360 0 0 Page 8

Extraction and Long Term Average Annual Extraction Limit (LTAAEL) – Lower Murray Deep Page 9

Water Source Overview (Usage Distribution) Page 10

Monitoring Bore Locations GW036743 GW036586 Page 11

Hydrograph – GW036823 Swan Hill Page 12

Hydrograph – GW036765 Womboota Page 13

Hydrograph – GW036742 Deniliquin Page 14

Hydrograph – GW036743 Blighty Page 15

Hydrograph – GW036586 Blighty Page 16

Hydrograph – GW036638 Urana Page 17

Hydrograph – GW036352 Lowesdale Page 18

Conclusions • Water levels have recovered to pre WSP levels by 2010/11 after a period of decline, particularly in Deniliquin – Finley area. Recovery is related to wet years and low extractions. Since 2010/11, levels have remained stable and but have began to decline since 2016. • The large drawdowns (18m Deniliquin; 21m Blighty) in monitoring bores are indicative of areas of significant groundwater extractions. • Annual groundwater extractions have not exceeded the Long Term Average Annual Extraction Limit (LTAAEL) in Lower Murray deep groundwater source except in 2018/19. The rolling average has not yet been exceeded. • Annual groundwater extractions of the Lower Murray Shallow water source were between 1,200 ML and 7,400 ML from 2012/13 to 2017/18 (limited metering). • Temporary (71T) and permanent trading (71Q) within the deep groundwater source remains active. Temporary trading in the shallow water source has been very limited and no permanent trade (71Q dealings) has taken place. Page 19