Floods on the River Barwon. 



Ill 



I have also compiled a table in which is given what might 

 be termed safe practical moduli of rupture for six of the 

 principal hardwoods of the group. This I have made up from 

 the different series of experiments, giving them values in 

 accordance with their comprehensiveness and completeness, 

 and then making certain deductions to ensure being upon the 

 safe side. I have confidence that the results present fair 

 average values for the transverse strength of the timbers 

 named ; that they err, if at all, in being below the mark ; and 

 that they are sufficiently sure data for all calculations for 

 purposes of construction. 



Timber. Moduli of Eupture. 



1. Ironbark 16,000 ha. 



... 11,000 

 ... 10,000 



2. 

 3. 

 4. 

 5. 

 6. 



Bluegum ... 

 Yellow box 

 Spotted gum 

 Stringy-bark 

 Red gum- ... 



10,000 

 9,000 

 8.000 



Tamworth, N.S.W., October 31st, 1881. 



Art. VI. — Floods on the River Barvjon. 



By W. C. Kernot, M.A., C.E. 



[Read 8th June, 1882.] 



Having been prevented by circumstances of a very painful 

 and urgent nature from taking part in the discussion upon 

 Mr. W. W. Culcheth's paper upon the above subject, I venture 

 at this comparatively late period to submit my views upon 

 a question which all will admit to possess the highest practical 

 importance. 



The due proportioning of the waterway of bridges is a 

 question of vital moment to the railway, road, or hydraulic 

 engineer. If the waterways are made needlessly large, the 

 waste of money may be most serious ; if they are unduly 



