Territory Stories

Alligator Rivers region regional surface water quality monitoring : November 1978 - April 1981



Alligator Rivers region regional surface water quality monitoring : November 1978 - April 1981

Other title

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

Publisher name

Northern Territory Government

Place of publication



Report ; 49/1983


3 volumes. ; 30 cm

File type



Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government



Related links

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]

Parent handle


Citation address


Related items

https://hdl.handle.net/10070/672729; https://hdl.handle.net/10070/672727

Page content

Technical Report WRD83049 Viewed at 14:07:10 on 29/07/2010 Page 44 of 440. I I I I I I I I I I I I I I I I I I I I 43. differences. These two billabongs are similar in liminology and sediment type. Island Billabong is"of slightly different type with a more sandy bottom, and this is shown in differing suspended solids. The conductivity and sodium concentration differences may be attributable to seawater infiltration in the lower billabongs (via groundwater). There does however appear to be a distinct difference in urani~~ concentration between the lower billabongs and Island Billabong with distinctly lower levels in Island Billabong. This may be attributable to natural runoff from uranium rich strata or activities on site. d) Koongarra:- No significant difference may be seen between sites upstream and downstre&~ of Koongarra except for pH. This may be due to the type of source of the stream; primarily runoff for the downstream site, and primarily a spring for the upstream site. The upstream site shows a detectable level of radium in some samples, whereas the downstrea"l\ site does not. One would expect a similar difference in uranium levels, but this does not occur. e) Jabiru townsite:- Again similar - trends are exhibited by the sites upstream and downstream of the town site, with slightly more suspended solids and nutrient at the upstream site. A small uranium pea~ may be seen at the downstream site, but this does not appear significant. Plots of this type comparing chemical parameters upstream and downstream of sites of interest, may be the best way to quantify changes directly due to site activities. 7.4.8 Water Year Plots These are parameter plots with each years results plotted on the same 1 year base. The base chosen is the water year used by Water Division; September to August. In most cases there is little difference between respective year plots, with any differences attributable to onset of rainfall and differences in discharge of streams. Reduced discharge in the 1978/79 wet season is reflected in some plots by high nutrients and suspended solids, and these effects becoming more significant earlier in the following dry season than in other years. On the basis of the plots presented here, the above effect is not shmV'n in well flushed sites and non-productive billabongs (i.e. stream billabongs like Mudginberri). It does become prevalent in isolated productive billabongs (eg. nutrient in Goanna Billabong, although this may be more attributable to the effects of the sewage plant (package plant) discharging from Jabiru town)~ Sites for these plots are representative of most types of sites encountered in the monitoring. These plots are considered the best way to quantify long term changes in water quality.

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