CxIlI. DISCUSSION. 
that the diversion weirs at the Pheasant’s Nest and 
Broughton’s Pass be so constructed as to allow of any 
quantity up to 10 million gallons to pass down the rivers, 
and that none be drawn away by the tunnels, until the 
discharge exceeds that quantity up to 80 million gallons. 
When the matter came to be investigated by Mr. W. Clark, 
he advised that the works be designed, to take all the 
water coming down, up to 150 million gallons daily from 
the Nepean and Cataract rivers, and that provision be 
made to impound water in the lower reaches of the river, 
to compensate for the loss of water diverted for the supply 
of Sydney. With the exception of a small concrete weir 
on the rocks just below Menangle Bridge, I am not aware 
that anything has been done in the direction suggested by 
Mr. Olark; but the people are undoubtedly entitled to this 
provision. 
In the case of the proposal to obtain an additional supply 
for Sydney from the Woronora and O’Hare’s Creek, Mr. 
Houghton is in error when he states that it is proposed to 
take all the water. It is proposed to allow a sufficient 
quantity, equal to the dry weather flow of the streams, to 
pass down the rivers, and to construct low weirs in suitable 
places to hold up the water, and prevent it from running 
to waste to the sea during freshets. Under this arrange- 
ment, the people would be better off than they are now, 
inasmuch as they would have an assured supply, which they 
have not at present. There are occasions when the streams 
practically cease to run during extreme droughts. 
Mr. Houghton considered “ that a large city like Sydney 
should look to sources further afield than the Woronora- 
O’Hare’s Creek proposal. The future source of supply in 
his opinion should come from the other side of the Nepean, 
such as the Grose, Warragamba, or Colo rivers, rather than 
from small extensions of the present catchment area.’’ To 
