ARTESIAN WATER IN THE STATE OP QUEENSLAND, AUSTRALIA. 189 



large map, the success of all the bores regarding which 

 reliable information as to the altitude of the sites was 

 available. In some cases, the wires protruded over the 

 surface, denoting an artesian supply, while in others the 

 wires stopped short of the surface, denoting sub-artesian 

 water. We also drew diagrams, of v/hich this is a 

 generalisation, in which the line E C shows the hydrostatic 



Diagram to Illustrate the Conditions Governing the Rise of 

 THE Underground Waters. 



AA. Impermeable strata. 

 BB. Water-bearing stratum 



C. Intake of water-bearing stratum. 



D. Outlet of water-bearing stratum. 

 EC. Hydrostatic surface. 



FC. Hydraulic surface. 



GG. Flowing bores (artesian). 



H. Non-flowing bore (sub-artesian). 



surface, i.e., the height of the head of water, to which height 

 water would rise in a bore with a perfect artesian basin 

 with no outlet, F C the hydraulic surface — a line drawn from 

 the intake to the sea, being the line to which water should 

 rise in a bore between the two points on the theory of an 

 outlet to the sea, giving artesian water where the surface of 

 the land is below the hydraulic surface and sub-artesian 

 where the land surface is above the hydraulic surface. 

 The piezometric height is represented by a vertical line 

 dropped from the hydraulic surface through the site of the 

 bore to the water-bearing stratum. The piezometric height 

 is above the surface where there is artesian water and 

 below the surface where there is only sub-artesian. 



