162 president's address — section h. 



miles from the South Head, and known as Ben Buckler's 

 Pohit. The Southern Section, draining eleven Imndred acres, 

 discharging at Botany on a sewerage farm. The Western 

 Section, draining about 31 square miles, will also when 

 completed discharge at Botany on a sewerage farm. The 

 intercepting sewer discharging at Ben Buckler's Point 

 receives the discharges of many old sewers which formerly 

 discharged into the Harbour. These old sewers were designed 

 on the combined system, and carry much silt from the street 

 gully shafts. In times of heavy rain the diluted sewage 

 escapes over a weir at Ruslicutters' Bay into a storm-water 

 channel, discharging into the Harbour. The practice in 

 Sydney with new sewers is to exclude surface water as much 

 as possible. The sewerage of Dunedin appears to me to be 

 much in the same state as the sewerage of Sydney before the 

 intercepting sewers were constructed, and they receive storm- 

 water through street gulleys, and are good examples of the 

 evils of the combined system. The Engineer, Mr. S. H. 

 Mirams, informs me that the city is divided into five 

 Drainage Districts, each provided with a main intercepting 

 sewer, discharging into the Dunedin Harbour. Up to the 

 present £42,000 has been expended on drainage. Mr. 

 Mirams proposes to construct an intercepting sewer to 

 receive the discharge of the five intercepting sewers referred 

 to, and convey it to the ocean beach. The fall of this main 

 trunk sewer is not sufficient to discharge the water from the 

 city at the ocean by gravitation alone, and consequently the 

 sewage, when collected at a certain point, must be raised by 

 artificial means. It is proposed to exclude storm-water as 

 much as possible from the main trunk sewer, and to provide 

 means for discharging flood-waters and dilute sewage from the 

 present sewers into the Harbour. I merely mention that it 

 may be more satisfactoi'y to use these five sewers as storm- 

 water drains only, and to design a complete system of drainage 

 on the separate system, taking advantage of Shone's System 

 of elevating the sewage of the low-lying portions. 



The sewage of Wellington has been reported on recently 

 by Messrs. Cuthbert and Ferguson, and they have recom- 

 mended the adoption of the partially separate system, with 

 Shone's method of pumping the sewage from low-lying 

 districts. The drainage of Christchurch was designed and 

 carried out by Mr. Napier Bell, M. Inst. C.E., but the works 

 are now in charge of Mr. Cuthbert, M. Inst. C.E. 



A report has been just published on the proposed sewerage 



