In 1905 the respondent owned numbers 10 and 11 of the subdivi-
sion, and the appellant owned the adjoining allotments on the east-
ern side, numbers 12, 13, 14, and 15. he title was under the
Transfer of Land Act 1890, and the parties were the registered
proprietors of their allotments respectively. In that year the
appellant sold and transferred No. 12 to the respondent, and
the boundary line between those allotments then became their
common boundary. Many years before the parties first acquired
the land the Government Railway Department had excavated
the site of the subdivision, taking out the surface to the extent
of a few feet in depth, leaving the bottom with a general slope
from north-west to north-east, so that surface water falling on re-
spondent's allotment 12 would flow naturally onto appellant's allot-
ment 13. I mention the circumstance of the excavation, not be-
cause I think it has any relevancy to the matter under considera-
tion, but because the learned Judges in the Supreme Court seem
to have held that the principles of law regulating the rights
of adjoining land owners with regard to the flow of water over
the natural surface of the land from the higher to the lower
land had no application to a case in which the natural surface
had been altered. In my opinion there can be no reason for
any such distinction between the natural surface and the arti-
ficial surface. Whatever rights or liabilities arise at common law
by reason of the surface slope of adjoining allotments must be
based on the conditions actually existing when the rights arise.
The surface as it then exists whether artificial or not is, for the
purpose of applying the law regulating the rights of the respec-
tive owners, the natural surface. The proposition laid down by
the Supreme Court would lead to some extraordinary conse-
quences. Adjoining land owners, who had built on filled in land,
for instance, would either have their rights regulated by the slope
of the original surface buried many feet beneath them, or else the
ordinary principles of the common law regulating such rights
could have no application to them. Mr. Dethridge, the respon-
dent's counsel, very properly, in my opinion, declined to adopt or
to rely upon any such distinction. I take it, therefore, that what-
ever was the surface condition of the land when these parties
first became adjoining owners, that is, when the appellant sold