I. — On the Heavy Fall of Rain in Hohart Town, on the 

 %%th and %lth of Fehruary, 1854, with reference to the 

 Sewerage, Drainage, dec., of the City. By His Excel- 

 lency Sir W. T. Denison, F.K.S., &c. {Bead Qth 

 March, 1854.] 



In laying before the Eoyal Society of Van Diemen's Land 

 the accompanying return of the amount of rain which fell 

 on Sunday and Monday, the 26th and 27th February, I 

 wish to draw attention to the bearing of the facts thus 

 brought prominently under notice, upon the question of 

 the Sewerage of the Town, to which allusion was made 

 in a paper read by me at the meeting of the Society in 

 November 1853. 



In that paper I pointed out the necessity of proportioning 

 the size of the sewer to the maximum amount of water 

 which would have to pass through it, and I also drew at- 

 tention to the fact, that the water would be discharged more 

 rapidly into the main sewer from a surface properly drained 

 than when it was left to find its own way through narrow, 

 tortuous, and imperfect channels, and, therefore, that the 

 more perfect the system of drainage, the larger must be the 

 main outlet. 



I own, however, that I never anticipated the probability 

 of such a fall of rain as has lately taken place, amounting, 

 as it appears, to 8f inches in thirty-four hours; and it is 

 principally with a view of placing this fact upon record, 

 for the guidance of those who may hereafter be called upon 

 to carry out a system of drainage for the town, that I sub- 

 mit the following remarks, which may be considered as 



VOL. III. PART I. A 



