Katherine Groundwater Investigations, Cretaceous Sediments near the King River,1985.
Yin Foo, Des
E-Publications; E-Books; PublicationNT; Report ; 3/1985
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Dept. of Mines and Energy
Report ; 3/1985
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Technical Report WRD85003 Viewed at 14:07:03 on 29/07/2010 Page 20 of 45. 2.3 Groundwater Movement and Recharge The lack of potentiometric level data north of line FBG (see Figure 2.l(a) does not permit detailed study of groundwater movements in that area. However, groundwater movement in this northern area is postulated to be directed into three principal areas. (i) ( ii) (iii) Low lying swamps and springs at the base of scarp areas. Base flow in perennial streams and throughflow into adjacent formations. A scarp borders the north-western edge of the Cretaceous Formation. At the scarp base, springs and small swamps have developed. Inspection of an available satellite image (Landsat-D enhanced in bands 4,5 & 7) indicates that these are localised and do not give rise to any significant streamflow. The bulk of groundwater in the area north of line FBG is postulated to move towards the King River and also southwards. The base flow of the King River is derived from the sediments adjacent to the stream north of line FBG, where it has incised through to the basement formation. Stream gaugings have not been conducted north of the Stuart Highway, and dry season flow records are scant. However, observations made at various locations along the river north of the gauging station (GS 814-086) during the investigation indicates the river is effluent north of line FBG and flows at around 150 Lis (13 ML/day). The river traverses the section between that line and the Stuart Highway with no apparent increase in flow. This can be expected since the Cretaceous Formation becomes deeper, and in the vicinity of the highway 1 a thick sequence of impervious clays has been shown to underlie that area (Leach Lagoon, a perched water table, has developed as a consequence). Between the Stuart Highway and the gauging station, the King River becomes influent, losing approximately two thirds of its flow to the underlying limestone formation. Stream gaugings at the locations shown on Figure 2.3(a) are required in order to obtain a better understanding of the behaviour of the system. The northern gauging within the effluent section of the stream will enable groundwater inflow to be quantified. DYF:TJ:79 04:REP4