262 THE PROSPECT AND KENNY HILL SCHEMES, 
cient depth left to provide for settlement of sediment. It cannot 
be termed imaginative in assuming the storage of three thousand 
million gallons unavailable for supply as a great waste of water, a 
under any ci t , such a great depth as 50 feet for settlement 
of suspended matter would be excessive, whilst with a water 
which, by careful analysis, only gives 4-6 grains of solid matter to 
the gallon it is still more beyond the limits of requirement. Sup- 
posing the amount of sedimentary matter at 2 grains per gallon 
and a constant inflow of seventy million gallons daily, it would 
take five years to cover 400 acres with 1 inch of deposit. The 
cost of the construction of the dams and outlet works and the pur- 
chase of the land shows only a difference of £7,000 in favour of 
the Kenny Hill dam and works. Both dams are solid embank- 
ments. The water from the Prospect reservoir is drawn 
through a water tower into a tunnel excavate 
through the hill on which the dam abuts on its eastern end. The 
outflow from the Kenny Hill reservoir is through a valve tower 
into two 36-inch pipes, laid in a tunnel of solid rock, which, enter- 
ing the Nepean side of the dividing range, debouches on the 
Campbelltown side. | 
Service RESERVOIR. zi ie 
Connected with the Kenny Hill storage reserv' ir, forming, in 
fact, a very important accessory to it, is a small supply oF! ie 
ae 
a. 
aily for the ines : 
he 
82 million gallons), it vall | 
next month by a flow of 1,382 m erate million ; ons W 
salt 
