Land Treatment of Sewagre. 



bacteriological, of the sewage will be found at the end 

 of this section compared with those of the effluent 

 and of the stream. 



The Soil on the farm varies 

 somewhat. For the most part 

 there is from 7 in. to 15 in. sur- 

 face soil of a light, porous, sandy loam, interspersed 



Soil 

 and Subsoil. 



main drains are 132 ft. apart and the feeders 66 ft. 

 Subsoil Water and Floods. — There is practically no 

 sabsoil water on the farm at the depth at which 

 the pipes are laid. The irrigation land is not liable 

 to floods. 



The Mechanical Analysis shows the following per- 

 centage composition of the ignited soil and subsoil : — 



with and overlying (Subsoil) river valley gravel and 

 sand. It is admirably adapted for sewage filtration. 

 Under-drainage. — The entire farm is under-drained 

 by 4-in. agricultural pipe feeders, laid herring-bone, 

 and 7-in. to 12-in. socketted pipe mains, which in 

 turn are connected, where necessary, into larger 

 pipe mains. The feeder drains are laid from 



The approximate number of particles in 1 gramme 

 is for soil 819,191,490, subsoil 290,000,-370 ; and in 

 1 c.c. for soil 1,181,291,470, subsoil 514,162,730. 



The Lime (parts per 100,(XK)) dissolved by water 

 in twenty-four hours is for soil 0009, subsoil 0-017 ; 

 and dissolved by water saturated with carbonic acid 

 in forty-eight hours, for soil 0060, subsoil 0070. 



4 ft. 6 in. to 7 ft. 6 in. deep. The main drains are 

 laid from 6 ft. to 10 ft. deep. Upon an area of 

 120 acres (" closely drained area ") the main drains 

 are laid at a distance of 66 ft. and the 4-in. feeders 

 33 ft. apart. On the remainder of the farm the 



The total area of the farm is 

 907 acres, and of this 651 acres 

 are available for sewage treat- 

 ment. The average area under irrigation at one 

 time is 3(X) acres ; the population served is 258,584 



Aoreagre, 

 Population, &o. 



44 



