HISTORY OF CIVIL ENGINEERING IN NEW SOUTH WALES. 625 



The following are the particulars of the aqueducts : — 



SimpsoJi's Creek at the seventh mile. — Diameter of pipe, eight 

 feet. Spans — two, twelve-feet ; two, thirty -three-feet ; and one, 

 sixty-feet, making a total length of one hundred and fifty feet 

 between abutments; gradient, one in 524.445; height of pipe 

 above flood level in creek, twenty feet. 



Elladale Creek at seven and three-quarter miles. — Diameter, 

 eight feet. Spans, two twelve-feet; two twenty-three and a-half- 

 feet, four, thirty-three-feet ; six, thirty-five and a-third-feet ; and 

 four, sixty-feet ; total length, six hundred and tifty-five-feet. The 

 form of this flume is an inverted syphon lowering the centre 

 portion to thiity-one feet below the bed level, and thirty-nine 

 feet above flood level. This arrangement avoids unnecessary 

 height of piers. The gradient is one in 699.786. 



Ousedale Creek at a little beyond nine and a-quarter miles. — 

 Diameter, seven and a-half feet. Spans — two, twelve and a-quarter- 

 feet ; two, thirty-one-feet ; three, thirty-three and two thirds- 

 feet ; thre", thirty-seven and a-half-feet ; and two, sixty-feet. 

 Total length, four hundred and twenty feet. The form is an 

 inverted .syphon, the centre portion being twenty-nine feet below 

 bed level, and forty-one feet above flood level. The gradient is 

 one in 4:53.884. 



Midluly Creek at a little over nine and three-quarter miles. — 

 Diameter, seven and a-half feet. Total length, one hundred and 

 seventy feet. Gradient, one in four hundred and twenty-five feet. 



Leafs Creek at eleven miles. — Diameter, seven and a-half feet. 

 Spans — two, seven and a-half-feet ; one, thirty-seven feet ; one, 

 thirty -eight-feet ; and three, sixty -feet. Total length, two hun- 

 dred and seventy feet. Form inverted syphon, centi-e portion 

 being thirty-four feet below bed level, and forty-two feet above 

 flood level, Gradient, one in 459.965. 



Nepean Creek at eleven and three-quarter miles. — Diameter, 

 seven and a-half feet. Spans — two, twelve-feet ; two, tweuty- 

 eight-feet ; and one sixty-feet. Total length, one hundred and 

 sixty feet. Height above flood level, twelve feet ; gradient, 

 one in 489.296. 



Waudhausen Creek at twelve and three-quai'ter miles. — 

 Diameter, seven and a-half feet. Spans — two, twelve-feet ; two 

 forty-eight-feet ; and two, sixty-feet. Total length, two hundred 

 and forty feet. Height above flood level, forty-seven feet ; 

 gradient, one in 382.155. 



Menangle Creek at fourteen and a-quarter miles. Diameter, 

 seven and a-half feet. Spans— two, twelve-feet ; one thirty and 

 a-half-feet ; two, sixty-feet ; and five, thirty-one and a-half-feet. 

 Total length, three hundred and thirty-two feet. Height above 

 flood level is fifteen feet ; gradient, one in 431.729. 

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