Notting^ham. 



(Nottingham 239,384, Arnold 10,000, and Carlton 

 9,200), which works out at 397 persons per irrigable 

 acre, or 862 persons per acre for the average area 

 irrigated. The normal dry- weather flow is 27 

 gallons per head per diem. The amount treated 

 per acre for twenty-four hours at the normal rate of 

 flow is 23,300 gallons on the average area irrigated, 

 equal to 10,750 gallons on the whole irrigable area. 



Treatment 

 and Croppingr- 



Treatment. — The method of irri- 

 gation is as follows : About 300 

 acres are used per twenty-four 

 hours. The total, broadly speaking, is made up of 

 (a) 250 acres of land, which are used on the twelve- 

 hours' system about to be described, and (b) about 

 50 acres of the 120, acres referred to previously as 



a slightly longer period, or the sewage might be run 

 on both day and night for the remainder of the time. 

 Cropping. — The " closely drained area " is not 

 cropped as a rule and is kept as frequently ploughed 

 as possible. The crops grown on the farm are 

 mangolds, rye-grass, kohl-rabi, thousand-headed kale, 

 ox and market cabbages, swedes, potatoes, wheat, 

 oats, barley, and clover. Rye grass, mangolds and 

 cabbage are the chief crops. A large herd of dairy 

 cattle is kept and the milk, &c., is sold. 



Analyses— 



Sewage, Effluent 



and Stream. 



condition. 



The sewage is rather strong 

 and decidedly alkaline, but owing 

 to its long journey it arrives at 

 the farm in a well broken-up 

 The chief Chemical results are : — 



the " closely drained area," which are employed for 

 increases in the sewage flow. (a). The sewage is 

 run continuously in periods of twelve hours on to 

 each half (125 acres) alternately of the 250 acres 

 above mentioned. Thus each half (125 acres) is 

 allowed a resting period of twelve hours. About 

 50 acres of the " closely drained area " are sewaged 

 continuously until the land shows signs of becoming 

 over-sewaged. When this takes place a portion of 

 the remaining 70 acres is brought into use. Ap- 

 proximately the same land is sewaged for about one 

 month before the sewage is taken off. If, however, at 

 the end of that time the same area was continuing to 

 produce a satisfactory effluent it might be sewaged for 



" These are all percolation effluents . . . All the 

 effluents were of wonderful quality, the best of them 

 approaching in fact to drinking waters. They were 

 uniformly clear, colourless, and without smell . . . 

 The last samples examined . . . contained quite 

 appreciable amounts of red-brown flocculent sedi- 

 ment — no doubt vegetable growth from the drain 

 pipes, coated with hydroxide of iron. The effluents 

 were all alkaline in reaction, and contained (rela- 

 tively) a great deal of lime and much sulphate in 

 solution." (Part II., page 200.) " The Nottingham 

 farm treats on an excellent loamy soil and gravelly 

 subsoil, most of the land being cropped, a medium 

 volume of a rather strong sewage containing 40 per 



45 



