THE STATE OF THE MELBOURNE WATER SUPPLY. LXXIII, 
granite, discharging into Jack’s Creek, which is one of the 
branches of the Plenty River. It then follows the bed of 
this creek for 3 miles and enters the Tooroorong Reservoir, 
which receives the combined waters of the Hastern Plenty, 
Jack’s, Silver and Wallaby Creeks, from a total catchment 
area of 22,000 acres or 34°37 square miles. 
The dam of this reservoir is 15 chains long witha puddle 
wall; the inner slope is protected with granite pitchers. 
The area is 36 acres, and the storage capacity 60 million 
gallons. The water from the reservoir ig conveyed by a 
‘‘clear water channel,’’ 4% miles in length, lined with 
granite pitchers, having a carrying capacity of 120 million 
gallons per day, and discharges into the “Sold Plenty 
Aqueduct,’’ which connected the Plenty River with the 
Yan Yean Reservoir. The Yan Yean Reservoir is formed 
by the construction of an earthen bank, 49 chains long, 30 
feet high, 20 feet wide on top, inside slopes of 3to 1, outer 
slope of 2to1. The by-wash is 5 feet below the top of 
the bank and is at a level of 602 feet above low water at — 
Hobson’s Bay. When full the water covers an area of 
1,360 acres, with an average depth of 18 feet and maximum 
depth of 26 feet. The total capacity being 6,400 million 
gallons, of which 5,400 million gallons are available for 
consumption. Krom the reservoir the water enters an 
open aqueduct 7 miles long, which delivers into a small 
reservoir 14 feet deep and holding 3 million gallons, which 
serves as a pipe head, and is at an elevation of 485 feet over 
sea. The delivering capacity of the aqueduct to this point 
is 33 million gallons perday. From the pipe head reservoir 
three large mains viz., a 27 inch and two 30 inches lead 
the water to Preston Reservoir a distance of 7 miles. This 
reservoir as before stated, is 328 feet above sea level and 
holds 16 million gallons. This system served Melbourne 
for a considerable time, but the increasing population and 
5a—Sept. 16, 1908. 
