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.

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Check within Publication or with content Publisher.

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Page content

Technical Report WRD91026 Viewed at 15:07:48 on 29/07/2010 Page 7 of 107. 005~IJ system than is present in the groundwater system. This indicates gal vani sed steel pipework is corroding. To ensure reliability of the supply system the pipework and bore fittings should be replaced with inert materials. The corrosion study will indicate suitable materials to use. The cost to replace existing galvanised steel pipework clt bores and at water tanks with stai.nless steel is ,estimated to be $22,100. Note that cheaper materials may be applicable for use, depending on the results of the corrosion study. Replacement or Lini.ng of Galvanised Steel Tanks Due to the inability of pH correction to rel.iably protect the water distribution system from corrosion, replacement or lining of the galvanised steel tanks is recommended. Relining has been successful using woven plastic fabric and also pol.yurethane. Replacement with Fibre Reinforced Plastic tanks is also an option. Relining eof the three galvanised steel tanks using a woven plastic fabric is estimated to cost $7,900. Replacement of Copper Pipe and Brass Fittings in Houses Much higher levels of copper and zinc concentrations are found in water sampled from the houses than the groundwate.c source. There is also blue staining of bathroom fixtures and a 'metallic' taste to water at the ranger station. It pipework b,e replaced. for this purpose is recommended that all copper Polybutylene is now commonly used in coastal areas of the NT. Dezincification of brass fittings is a possible cause of the highe.:: levels of zinc concentrations in house tap water. DElzincification resistant brass should be used in taps, estimated meters, and other fittings. This work to cost $6,OOO/building, or a total is of $54,000, but this figure is very dependant on the needs of the client (see section 5 for the assumptions made in deterrninin'g this estimate).

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