43 
at Coulsdon, and even if the flow of water out of the 
hew culvert which was made a few years ago is added, 
the total flow into the head of the Wandle at Croydon 
on the 23rd February of this year was but 1,029°94 cubic 
feet per minute, a considerably less quantity than was 
flowing at Coulsdon, 
There can be no doubt that the waters of the Bourne 
have been transferred from the ordinary channels of the 
Bourne into the Croydon sewers, as it will be noted 
that since the year 1880, the volume of water flowing 
out of the Bourne culvert at Croydon does not appear to 
bear anything like the proper ratio which it should bear 
to the volume flowing immediately below the ‘ Rose 
and Crown ”’ at Coulsdon. In order to test this, the 
Author tried to ascertain what was the volume flowing 
in the Croydon sewers, but as the Corporation had 
recently declined to allow the sewers to be gauged, he 
had recourse to gauging on a dry day the effluent flow- 
ing off the sewage farm at Beddington when it was 
found on the undermentioned dates that the following 
quantities of water were flowing away. 
On the 11th March, 1904, about 17} million gallons a day 
” llth April, _,, » 105 ” ” ”» 
” 5th May, ” ” 93 ” ” ” 
” 11th May, ” ” 83 ” ” ” 
and as a rule the volume of effluent flowing off this 
farm is less than the volume flowing on to it owing to 
the loss from evaporation and a quantity of water flow- 
ing away to supply certain springs by leakage into the 
Thanet sand beds which underlie a portion of this farm. 
The quantity of water passing into these Croydon 
sewers is greater than it has ever been before, although 
the volume of the Bourne flow itself has not been so 
great as iu some previous years. 
No doubt 
Bourne waters 
have gone into 
Croydon 
sewers. 
Gauged 
Beddington 
sewage farm 
effluent. 
Quantities 
flowing off. 
Effluent is less 
than volume 
of sewage. 
