Drainage of Melbourne. 



117 







TABLE H. 





►utlet. 



Area in Acres. 



Mean Amount of Annual 



Mean Annual Sewage 







Rainfall in Gallons. 



in Gallons. 



A. 



53035 



340,731,206 



436,943,697 



B. 



248-20 



159,459,763 



203,670,000 



C. 



98-00 



62,961,550 



80,740,044 



D. 



53-00 



34,050,634 



43,665,534 



E. 



27-50 



17,667,782 



22,758,480 



Total 



... 95705 



614,870,935 



614,870,935 Rainfall 

 787,777,755 Sewage 



787,777,755 





1,402,648,690 Grand Total 





However, to determine the quantity of water discharged 

 at the various outlets during the heaviest rain fall in a given 

 time, we must refer back to Table C, where it will be found 

 that on the 2.3rd September, 1856, 092 inches fell during a 

 thunder-storm in twenty minutes. Upon this data, then, 

 we can determine the maximum rate per hour discharged at 

 these outlets, and thus be enabled to determine the size of 

 any sewer or culvert necessary to carry off the storm waters 

 from the city, by intercepting them at the intersection of 

 Stephen and Lonsdale-streets, and of Elizabeth and Latrobe- 

 streets. 



Table I. will shew the amount of sewage and storm water 

 discharged in twenty minutes. The sewage being the ordi- 

 nary waste water before alluded to, and the rain water being 

 that which fell as before recorded. It will also show the 

 rate per hour from both sources. 







TABLE 



I. 





Outlet. 



Sewage. 



Rainfall. 



Total. 



Total per hour. 



A. 



16-626 



11,037,771 



11,054,397 



33,163,191 



B. 



7-750 



5,165,597 



5,173,347 i 



15,520,041 



C. 



3072 



2,039,599 



2,042,671 



6,128,013 



D. 



1-661 



1,103,048 



1,104,709 



3,314,127 



E. 



866 



572,336 



573,202 



1,719,606 



Total 



29-975 



19,918,351 



19,948,326 



59,844,978 



From this table it will be seen that at outlet A the water 

 discharged during that storm was at the rate of 33,163,191 

 gallons per hour, and the water discharged at outlet B was 

 at the rate of 15,520,041 gallons per hour. 



