1 70 DR. E. ANGUS SMITH ON 



Irwell pure, every impure stream should be retained and puri- 

 fied before it is allowed to enter the main stream. But this 

 is a plan which will not suit all circumstances, as the river is 

 made impure by drainage direct in many places. Sometimes 

 it is a small sewer, which will not bear separate purification ; 

 sometimes it is the trickling out of impurities from the soil — 

 the drainage of dirty streets or land. 



Plan for Manchester and South Lancashire. 



The plan which I propose has already been published in a 

 skeleton form, but I will endeavour to explain it more fully. 

 I do not pretend to say that the plan is original, — it is made 

 up of the things that I have seen and heard, as most other 

 persons make their plans; but the result, at least, has 

 novelty, and of course, in my opinion, is the best hitherto 

 devised. As a whole, it was new to me. 



And first, I begin with the maxim similar to one I have 

 mentioned — that no dirty water should be allowed to go into 

 the river. If this is managed, the river will be clean. 



To effect this, every town would carry its drainage to a 

 point out of the town. The sewer water to be then treated by 

 precipitants, and allowed to pass off clean. When there is not 

 a town to be dealt with, but a district, then a certain portion 

 of the houses and works on the river bank will be united into 

 a drainage" district, and this sewer water will run into a drain 

 or drains parallel to the river, until there is a sufficient amount 

 collected for precipitation. There will be then a constant 

 succession of tanks, equal to the density of the population. 

 There will also be a continual line of sewage drains as far as 

 the population extends ; or, in other words, a dirty river 

 running parallel with the clean one : just as we have, in the 

 town, a set of sewer drains running parallel with our pure hill 

 water. The sewers of all houses must be sent into this drain, 

 and it will be a great advantage to all persons having isolated 



