7 
LVIII. E. K, SCOTT. | 
TABLE II. 
Height of R ; Sto 
Name, Country. Catchment area, | 2am Bove nad conaiieg iu qainhell 
acres. ran te be Acres. million gals. | inches. 
n feet, 
Cataract ...|N.S.Wales 32,000) 154 | 2,145) 21,410] 45 
Barren Jack he 3,200,000; 200 12.740 208,630; 30 
Coolgardie |W.Austral. 364,160} 100 800} 4,600} 26 
Beetaloo .../S. Australia in 118 ms ee 
Birmingham,) England 45,560; 128 | 1,499| 18,000) 69 
L. Thirlmere | "acheter 11,000 52 793 8,130) 85 
L. Vyrnwy | (rue 23,500} 85 |.1,115| 12,000 | 68> 
Bombay. ...| India | 398,000; 118 | 3,520) 16,070) fe2 
TABLE III. 
Egypt. In United States. 
Name. Assuan. | Roosevelt. | Shoshone. ; Pathfinder. 
Length in feet. LAS ae 6,562 1,080 175 226 
Maximum height in feet ; oe 141 284 326 215 
Maximum water Prey in feet L¢ 107 242 243 195 
Crest width feet ... ; +r et 36 16 LOS 10 
Down-stream batter  ... my 372 3°2 41 4°1 
Up-stream batter... ie +7 ay 181 20°1 20°3 20°3 
Volume, cubic yards _.... a ¥ 790.000 340,000 69,000 53,000 
Gates 140 --63/ x 23'| 3—43/x10/| 83—3/2”x 7’ | 4—8/2" x7! 
c lees vee see eee «ee *** 40 --63! x 113/ ; 
Storage, acre feet... By oF ...| 1,860,000 1,284,000 456,000 1,025,000 
Material... y ns a ...| granite sandstone | concrete granite 
rubble« rubble masonry rubble 
Nore —The Assouan dam is now being raised from its original maximum height of 
118 to 141 feet. 
In order to continue to develop power from an irrigation 
dam when the water is low and at the same time not lose 
the use of it for irrigation purposes a balance reservoir 
must be arranged at alower level. Inthe Trawool scheme 
this is already provided for by the Waranga Basin which has 
a capacity of 9,000 million cubic feet, and which can be 
nearly doubled by raising the wall another 10 feet. To 
obtain power from Barren Jack all the year round similar 
provision would have to be made. The varying height of 
water behind the irrigation dam which at Trawool would 
be from say 140 down to 60 feet presents a difficulty, but 
it can be overcome by providing special turbines. For 
example, they might be made to work in series on the 
higher and in parallel on the lower heads. 
