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Assessment of the Jabiluka Project : report of the Supervising Scientist to the World Heritage Committee



Assessment of the Jabiluka Project : report of the Supervising Scientist to the World Heritage Committee


Johnston, A.; Prendergast, J. B.; Bridgewater, Peter


E-Publications; E-Books; PublicationNT; Supervising Scientist Report; 138




Alligator Rivers Region

Table of contents

Main report--Appendix 2 of the Main Report. Submission to the Mission of the World Heritage Committee by some Australian Scientists ... --Attachment A. Johnston A. and Needham S. 1999. Protection of the environment near the Ranger uranium mine--Attachment B. Bureau of Meteorology 1999. Hydrometeorological analysis relevant to Jabiluka--Attachment C. Jones, R.N., Hennessy, K.J. and Abbs, D.J. 1999. Climate change analysis relevant to Jabiluka--Attachment D. Chiew, F and Wang, Q.J. 1999. Hydrological anaysis relevant to surface water storage at Jabiluka--Attachment E. Kalf, F. and Dudgeon, C. 1999. Analysis of long term groundwater dispersal of contaminants from proposed Jabiluka mine tailings repositories--Appendix 2 of Attachment E. Simulation of leaching on non-reactive and radionuclide contaminants from proposed Jabiluka silo banks.




Uranium mill tailings - Environmental aspects - Northern Territory - Alligator Rivers Region; Environmental impact analysis - Northern Territory - Jabiluka; Uranium mines and mining - Environmental aspects - Northern Territory - Jabiluka; Jabiluka - Environmental aspects

Publisher name

Environment Australia

Place of publication

Canberra (A.C.T.)


Supervising Scientist Report; 138


1 volume (various pagings) : illustrations, maps

File type






Copyright owner

Environment Australia



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Citation address


Related items

https://hdl.handle.net/10070/462403; https://hdl.handle.net/10070/462400; https://hdl.handle.net/10070/462405; https://hdl.handle.net/10070/462406; https://hdl.handle.net/10070/462408; https://hdl.handle.net/10070/462409; https://hdl.handle.net/10070/462411

Page content

62 A second dilution scenario has, therefore, been examined in which it is assumed that an extreme rainfall event (with a return period in excess of 1 in 100) occurs at the end of what would already be an extreme rainfall year (1 in 1000). It is also assumed that the event is centred on the TCZ and that the intensity of the storm reduces in magnitude as a function of distance from the TCZ. The data on such a storm have been derived from the exceptionally severe storm that occurred at Jabiru on 4 February 1980. The storm had a duration of 16 hours with a total rainfall registration of 303 mm at Jabiru East but within the storm there was a remarkably high rainfall burst with a duration of 5 hours and a recorded rainfall of 240 mm. At the time of this event, there were 10 continuously recording streamflow stations operating in the Magela Creek catchment and 21 continuously recording rainfall stations. The amount of data available from this recording network enabled an unusually detailed analysis of the storm to be undertaken by the Water Division of the Northern Territory Department of Transport and Works (Water Division 1982). This analysis used a flood-routing model to extend and reconcile the rainfall pattern with the resultant flood down the Magela Creek and its tributaries. Figure 5.3.3 The hydrograph for Gulungul Creek and the recorded rainfall at Jabiru East near Ranger for the severe storm of 4 February 1980 One of the tributaries of the Magela Creek that was used in the analysis was Gulungul Creek which drains part of the Ranger mine site. The catchment of Gulungul Creek is 46 km2 which is very close to the catchment size of Swift Creek. The flood hydrograph for Gulungul Creek in response to the storm should, therefore, be a very good analogue for the response of Swift Creek to an unusually intense short storm. The rainfall data and the Gulungul Creek hydrograph are shown in figure 5.3.3. The flow observed in the creek during the 5 hour period when the storm was most intense was only 14% of the total flow over the complete hydrograph. This analysis indicates, therefore, that if water draining the TCZ at Jabiluka reaches Swift Creek without significant delay, the dilution would be reduced to about 900:1. C re ek F lo w ( m 3 / s) 100 200 300 400 Time (hours) 0 5 10 15 20 25 30 35 40 R ai nf al l ( m m ) 20 40 60