Page 82 - Hydrogeology Principles and Practice

HYDC02 12/5/05 5:38 PM Page 65

Physical hydrogeology 65

BO X
Continued
2.11

Fig. 2 Map showing lateral extent of hydrogeological units forming the Great Artesian Basin. After Habermehl (1980).

Groundwater recharge occurs mainly in the eastern marginal as well as a component northwards (Fig. 4). Recharge also occurs
zone on the western slope of the Great Dividing Range in an area of along the western margin of the Basin and in the arid centre of the
relatively high rainfall (median annual rainfall >500 mm) and continent with groundwater flow towards the southwestern dis-
large-scale regional groundwater movement is predominantly charge margin. Natural groundwater discharge occurs as groups of
towards the southwestern, western and southern discharge margins, springs (Fig. 4) that are commonly characterized by conical mounds