Territory Stories

East Alligator district centre water supply assessment : Kakadu National Park



East Alligator district centre water supply assessment : Kakadu National Park

Other title

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.)

Publisher name

Power and Water Authority

Place of publication



Technical Report ; 26/1991


1 v. : ill., maps ; 30 cm.

File type


Copyright owner

Check within Publication or with content Publisher.

Parent handle


Citation address


Page content

Technical Report WRD91026 Viewed at 15:07:48 on 29/07/2010 Page 44 of 107. 4.8 AUGMENTATION OF GROUNDWATER SUPPLY 4.8. 1 UPsrade Existins Bores The potential for upgrading existing bores is limited to bores outside the main :borefield area. Bores in the fractured rock aquifer should be at least one kilometre apart (if indeed, this aquifer extends for this distance). Extraction from the existing borefield should kL/day and then only from RN 23449 and be 1 imi ted t.o 130 23450. It is recommended that e,Bch bore not be pumped at greater than 1.2 Lis (the current pump rate is 2.2 Lis). This will result in near continuous pumping in the peak demand periods but will result in reduced drawdowns in each bore due to pumping. Each bore should be operated on alternate days and provision be made for both bores to operate simultaneously (only ~uring peak demand periods) as one b:>re may not be sufficient to supply the peak demand at the rec~uced pumping rate. RN 20636 should not be used as it is dr"lled in the same fracture as RN 23449. RN 20637 is currently unserviceable due to sand entering the bore through the slots in the casing. and should not be recommissioned. This leaves RN 20480 and 20559 for consideration. RN 20480 should only be used in an emergency due to the presence of high iron concentration in the water caused by corrosion of the steel casing. Little is known of the construction of this bore but it is possible that the bore can be relined with 104 mm internal diameter PVC casing. Relining in this way should not cut: down the capacity of the bore but a new pump may be required. RN 20480 could then be brought back into permanent Bel:vice, provided the galvanised steel section of the rising main from the bore is replaced with a less corrosive material. RN 20559 was decommissioned due to a reported sulphur smell in the water. This i.s not present in the water source itself, but ra ther it is probably due to some contaminant introduced into the bore. This contaminant should be i.dentified and remedial work undertaken to prevent recontamination before this bore is recommissioned. This bore when first drilled and tested was 005MJ

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