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 25 of 107. There have been occasions when contamination appears to have occurred in the J3ystem, a1 though E. coli organisms have been detected only on the one occasion, on 5 December 1990 in a sample taken from the bore tap at RN 20480. The source of this contamination is not known, but contamination may have occurred when this bore was re-equipped in October 1990. There is also a possibility of the E. coli being present due to insufficient sterilisation of the bore tap at the time of sampling. There are some high counts of coliforms and streptococci in the testing record (Appendix 2). These occur only at points in the distribution system, and not from the bores (except as just mentioned for RN 2(480). This level of contamination is to be expected in a water system that is not disinfected, and is not considered to be a problem, provided moni tor in-go is (monthly monitoring maintained at least at its current level is recommended) and investigation of contamination sourGes and remedial action is undertaken whenever high coliform counts (greater than 10/100 mLl are detected (Reference 4). The most likely course of contamination is the presence of animals in a storage tank. All possible entrances to water tanks sho,~ld be sealed to prevent this occurring. 2.4.4 Corrosivity of Water Supply Corrosi vi ty of a water may be defined as the potential or ability of that water to dissolve materials of construction. Two methods of ass,~ssing and predicting the corrosive tendencies of a water are the Langelier Saturation Index and the Ryznar Stability Index (Reference 6). These indices are related to the pH of the water sample and the calculated pH saturated with CaC0 3 at the hardn'~ss and alkalinity of the \vater sample (pHs). Generally waters become more corrosive with decre.asing alkalinity and if low concentrations of Ca2 + ions are present then there is a decreased tendency for a protective CaC03 scale to be deposited on a surface in contact with the water. 005MJ
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