150 



REPORT 1872, 



attention being drawn at the same time to tlic exceptionally -weak character 

 of the sewage ; and bearing this in mind, they snggest that " it may be neces- 

 sary, in order to secure efficient pnrification, to lay out as intermittent filters 

 even double the area of land per 10,000 of population that is employed at 

 Merthyr Tydfil, where only from two to five acres per 10,000 people were 

 being employed." 



The following are the analyses of the samples taken by the Committee : — 



Sewage-Farm at Merthyr Tydfil. Analyses taken 10th to loth January, 1 872. 



N.B. — Samples taken every two hours during the day, in the proportion of js^ns of 

 the iiovf per minute. Results given in parts per 100,U00. 



Sewagc-Farm at Merthyr Tydfil. Analyses taken 2nd to 8th July, 1872. 



N.B.— Samples taken every two hours duririg the day, in tlie proporlion of tdJcu of 

 the flow per minute. Results given in parts per 100,Ut)t). 



Ceseription of 

 .san)ple8. 



Sewage as entering 

 farm 



Effluentwater from 

 outfall 





Solid matter. 



Insolation I--P- 



■Co 



\ 

 CO j 44-SO 



65 35'cO 



■s.\ 7°. 



< ?, 



.'S\ P' 



31-80 IC-Ii 



I 



co-so ... 



4-08 



6-53 

 "•SO 



With regard to the winter sewage, we see, from the decrease in the amount 

 of chlorine in the effluent water, that in this case each gallon of the sewage 

 had become mixed with 1-39 gallon of subsoil-water, containing -92 of 

 chlorine in 100,000 parts; this .shows a smaller amount of dilution than 

 that stated by the Elvers Pollution Commissioners, and so far agrees better 

 with our gaugings as above recorded. It will be noticed that the Coramis- 



