Alligator Rivers region regional surface water quality monitoring : November 1978 - April 1981
Alligator Rivers Region - Regional Surface Water Quality Monitoring, Volumes 1,2,3 (Plus draft)
Northern Territory. Department of Transport and Works. Water Division, Environmental Section
E-Publications; E-Books; PublicationNT; Report ; 49/1983
At head of title: Water Division, Dept. of Transport & Works, Northern Territory. "April 1983".
Water quality -- Northern Territory -- Alligator Rivers Region; Hydrology -- Northern Territory -- Alligator Rivers Region
Northern Territory Government
Report ; 49/1983
3 volumes. ; 30 cm
Attribution International 4.0 (CC BY 4.0)
Northern Territory Government
https://hdl.handle.net/10070/672725 [Alligator Rivers region regional surface water quality monitoring : November 1978 - April 1981 - WRD83049_v_1.pdf]; https://hdl.handle.net/10070/672727 [Alligator Rivers region regional surface water quality monitoring : November 1978 - April 1981 - WRD83049_v_2.pdf]; https://hdl.handle.net/10070/672729 [Alligator Rivers region regional surface water quality monitoring : November 1978 - April 1981 - WRD83049_v_3.pdf]
Technical Report WRD83049 Viewed at 14:07:10 on 29/07/2010 Page 46 of 440. I I I I I I I I I I I I I I I I I I I I R.S.P. 56 55 1227 54 45. TABLE 7.1 Cont'd \.VATER QUALITY SUi'!NARY JA JA BILLABONG - On the basis of past records, this billabong contains water throughout the entire year. The billabong is flushed by Magela waters during the wet season and evaporates during the dry season. It is classified by l'l"alker and 'r'.fler (1) as a floodplain billabong with suspected groundwater inflow during the dry season. The billabong shows increases in conductivity and suspended solids during the dry season causing macrophyte and algae growth. A large decrease of pH has been observed following first rains of the wet season. Several slight fluctuations of uranium concentration above detection limit have been observed at this site. JABILUKA BILLABONG - This is a permanent billabong s1m1lar to Ja Ja Billabong. It is classified as the same type, is similarly flushed and shows the same variations of conductivity, suspended solids and pH, and also nutrient. Suspended solids show a slightly smaller fluctuation than Ja Ja Billabong. Fluctuations in uranium are larger than Ja Ja Billabong. NANKEEN BILLABONG - This is a permanent waterhole and is classified by Walker and Tyler (l) as a floodplain billabong, being reasonably deep, 'tli th muddy sediments, large turbidity increases in the dry season and high water temperatures. This has been proven true, and also large amounts of weed and much wildlife have also been observed. Nutrient, carbon, conductivity and suspended solids show seasonal fluctuations with increases towards the end of the dry season. So does sodium with possible influx of seawater, either directly or via groundwater. PLAINS OUTFLOW - Water is present 9-10 months of the year, and h1gh turbidity is present for some of that time. Towards the end of the dry season turbidity, conductivity and a number of cations and anions increase in concentration, presumably due to evaporation and concentration in fixed water bodies. The concentration of several parameters including pH, TOC and hea~.f metals remain constant throughout the sampling period. Seawater infiltration is evident on some occasions, particularly towards the end of the dry season (see sodi~~ plot). Seawater infiltration may also be evident in seepage from groundwaters.
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