1,554 500,000 3,108
Twenty-five Mile Tank 1,881 500,000 3,762
Forty Mile Tank 1,546 500,000 3,092
Colreavy's Tank 2,193 997,000 2,199
The above table will give some idea of the enormous expense entailed by
the opening up of the interior. In addition to these, wells and bores were
put down, many of which failed to strike water.
Ever-thoughtful Nature has provided, on the surface of the "granites,"
small reservoirs which, after rain, may, in some cases, hold many hundred
gallons of water. The Rock - or Namma-holes (I presume "Namma" is a native
name, but of this I am uncertain) are usually more or less conical in
shape, and vary in depth from a few inches to twenty feet, and in diameter
from half a foot to several. Their sides are smooth, and slope down to a
rounded bottom, where stones are often found which would suggest that they
have had something to do with the formation of these peculiar holes.
Beneath a hard surface layer the rock becomes decomposed and comparatively
soft; and doubtless the rain of countless ages collecting round the
stones, once on the surface and now found at the bottom of the holes, has
at length weathered away the rock, and so by slow degrees the stone
has ground out an ever-increasing hollow. I am neither geologist nor
dentist, but I have often likened in my mind the formation of the
Namma-holes to the gradual hollow formed by decay in a tooth.
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