East Alligator district centre water supply assessment : Kakadu National Park
D . Pidsley
Jamieson, M.; Pidsley, D.; Paiva, Jerome
E-Publications; E-Books; PublicationNT; Technical Report ; 26/1991
Made available via the Publications (Legal Deposit) Act 2004 (NT).
Water-supply -- Northern Territory -- Kakadu National Park; Groundwater -- Northern Territory -- Kakadu National Park; Kakadu National Park (N.T.)
Power and Water Authority
Technical Report ; 26/1991
1 v. : ill., maps ; 30 cm.
Check within Publication or with content Publisher.
Technical Report WRD91026 Viewed at 15:07:48 on 29/07/2010 Page 45 of 107. recommended for a maximum continuous pumping rate of 1.5 Lis. Since that time thl~re is some evidence of a lowering of regional water levels due to pumping in the fractured rock aquifer to the west. This bore is now recommended for a maximum continuous rate of 0.5 Lis. The casing of this bore is steel and so the bore should be relined before recommissioning. 4.8.2 Potential Sites for New Bores It appears from drilling performed in the area (see Appendix 4) that the highest yielding bores in the area have been drilled in fractured Kombolgie sandstone. Bores drilled in non-fractured Kombolgie or in th'a Koolpin are generally of lower yield. The extent of the aquifer intercepted by the current borefield needs to be asce:~tained by further geophysics and drilling. Other bores could be drilled into this aquifer if they are at least one kilometr,e from the present borefield. Other fractured sandstone aquifers may also exist in the area around the Bulman Fault Zone. The region where new bores would be located is shown in Figure 4. Exact bore siting can only be confirmed after further investigative work is carried out. 4.9 ALTERNATIVE NON-POTABLE WATER SUPPLIES Potential sources ,of non potable water exist both in bores sited within the East Alligator Flood Plain and the river itself. Bores drilled outside the Bulman Fault Zone produce low yields, generally less than 0.2 Lis. Water quality varies from fresh to saline. The saline waters are likely to be more corrosive to reticulation components than the potable groundwaters. The East Alligator River represents the closest source of non potable water but the turbidity of the river flow limits the ability for direct extraction from the river. Due to the variable nature of the soils and rock comprising the river banks, siting a bore to extract bracki sh waters adj acent the river will be difficult. RN 8918 and 8919 were drilled about 200 m from the river in silty and produced water, yet RN's 24107, 005MJ clayey 24699 sand to 14 m depth and and 24700 were also
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