1891. | Van Wyh’s Vley. 39 
this gully has been kept to its proper direction by constant attention 
during floods and rectifications and other helps after their subsidence. 
Nos. 5 and 6 shew reversed views of a mile and half of the 
lower end of the furrow and are taken from elevations of (say) eighty 
feet above the water level. 
No. 7 is a view of the old homestead, the distributing furrow 
- is in the foreground and the figures are those of the workmen engaged 
in cleaning it preparatory to the season’s irrigation, but these facts 
cannot be gathered from the view itself. 
The dimensions of the canal are a total length of upwards of nine 
and a half miles with a clear waterway twenty-eight feet wide and 
four feet deep. The fall varies from rather less than two to a little 
over three feet per mile, the section for the flatter gradients being 
adopted in localities where the water can spread to a distance beyond 
the excavations, thus : 
and the steeper gradients being confined to places where the water 
is supported by steep banks on either side, thus: 
and where occasional rocky patches provide against a too rapid scour 
of the channel. The total cost of the work will be two thousand 
two hundred pounds. ~ 
For this expenditure a very material assistance is obtained. 
Under natural conditions, as before stated, the dam is found to 
catch but little more than enough water to meet its loss by evaporation 
and infiltration. This loss being provided for, nearly all the water 
supplied by the canal is a clear gain, and the water at command for 
irrigation purposes is very much augmented. The difference is akin 
to that between having just enough to live upon and having enough 
to live upon and something to spend on luxuries. 
(NOTE.—The photographs have not been re-produced, they are deposited in the Society’s 
Library.—Sec. S.A.P.8.] 
