176 REPORT— 1871. 



of -vrorking since April 15th was 10 hours per diem. The total quantity 

 pumped has been 



gallons. tons. 



96,944,653 = 432,788 

 Average per diem 264,876 = 1,182 



Effluent Water discJiarr/ed. — Owing to floods at the outlets of the pipes, 

 the quantities of effluent water discharged could not always be gauged. On 

 the 343 days during Avhich the observations could be taken, 



39,449,178 gaUon3 = 176,112 tons 



were discharged, being 



11.5,012 gallons=:513| tons per day. 



Assuming this to be the average quantity for the whole period, the total 

 quantity intercepted from the lower subsoil and discharged through the pipes 

 would be 



45,889,788 gallons =204,865 tons, 



or 47-3 per cent, of the sewage pumped. 



Sainfall. — The rainfall at Breton's during the total period of 399 days 

 has been 22-64 inches, or on 121| acres about 62| million gallons, equal to 

 277,900 tons, or 2287 tons per acre. 



Temperatures. — It will bo seen that tho temperatures of sewage and effluent 

 water have been very uniform as compared with that of tho air, being lower 

 during extreme heat and higher during extreme cold. This was very notice- 

 able during the severe frost of last winter. In one week, when the mean 

 noon-clay temperature of the air was 28°-5, that of the sewage received, 

 sewage pumped, and effluent water was 43°. The ranges of variation over 

 the total period have been : — ■ 



O o o 



Atmosphere 28-5 to 70 = 47"5 



Town-sewage 43 „ 66 = 23 



Sewage pumped 43 „ 07 = 24 



Effluent water 41 „ 64 = 23 



A remarkable feature in the record of temperatures is the extremely slow 

 rate at which the temperature of the effluent water fell, and the length of 

 time which elapsed before it recovered again. The first week that tho 

 average temperature at noon fell below the freezing-point was the one ending 

 31st December, when the average temperature of the air was 28°'5 T., and 

 that of the effluent water was 43° ; and after this, although the former rose, 

 the latter fell, so that in the week ending February 4th the average tempera- 

 ture of the air was 36°, and that of the effluent water 41°. The next week 

 the temperature of the air was 44'-^, the second week 47°, and the third week 

 47°, yet it was not until the third week that the temperature of the effluent 

 water recovered to 43°. 



Section III. — («) Observations on the Sewacie-Farm at Tunhrulye Wells. 



Before describing the results of the investigation by the Committee, it is 

 desirable to state that, in the selection of the land to be irrigated at Tunbridgo 

 Wells, it has been a sine qua non condition that it should be at such a level 

 that the sewage should reach it by gravitation ; and to this end two farms 



