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 4 of 440. I I I I I I I I I I I I I I I I I I I I 3. l. CONCLUSIONS From the data presented here, no detectable adverse effects have been recorded in the waterways due to uranium mining and milling activities. Sufficient good quality baseline data has been collected at most of the .regional monitoring sites to gauge future changes .. In particular a large quantity of data has been collected around mining sites. The monitoring has shown however, that water quality variations are extremely dependent on climatic variations, particularly quantity, duration and onset of rainfall. Some of these variations may be seen from figures 3-6 where gauge height changes may be considered indica ti 'Te of rain.fall. As expected, large differences are observed in >vater quality between the wet and dry season, with gradual increase in ion concentration during the dry season. This is a cyclic effect, and is much more pronounced in hydrogeologically isolated water bodies than those ;vi th groundwater inflmv. As magnitude and timing of ... vater quality changes are climatically determined, these changes often mask smaller changes from other sources. Any changes, to be detected, would need to be large to be outside the statistical spread of data. Some isolated short term effects causing changes in water quality may be attributed to activities at the mine and to~m sites. However these are isolated and not likely to cause any long term adverse effects. The results, although not a complete statement of information, is a solid basis to work on. The monitoring emphasis possibly needs modification with a move towards more indicative analysis parameters and more problem oriented sites. This, while adding to our baseline information vJill be more of a regulatory than a regional type. t<lonitoring has achieved its objectives to a large degree with the report providing the major data source to other supervising authorit.ies. However monitoring must continue to expand information. The main areas requiring expansion are improving baseline data, gaining more information about seasonal changes and monitoring for any conta~inant discharges. This must be carried out for both minesites and the tO\.Jnship.