54 PROCEEDINGS OF THE COTTESWOLD CLUB 



This was done twice a day for twelve days, (between 

 October the l8th and 29th) for the purpose of ascertaining 

 the quantity passing over the Weir, gathered from the 

 springs feeding the several rivers confluent to the Thames 

 above Lechlade, viz. : 



[The Thames Head and Swill Brook 

 N. side of the | „ Churn 



„ Ampney and Marston Waters 

 ,, Coin 

 The Dance Brook 

 „ Ray 



„ Shire Ditch 

 „ Byde Mill Brook 

 „ Cole 



Thames 



S. side of the 



Thames in 



the Swindon Basin 



The result of his experiments showed that the mean 

 flow of the 24 gaugings gave 3,242 cubic feet per minute, 

 and the mean of the flow 29,092,468 gallons per day. 



Mr Taunton, again twice a day, (morning and evening) 

 from November 22nd to December 1st inclusive, com- 

 pleted the 36 gaugings, " which gave him the mean of 

 2,135 cubic feet per minute, with .the mean flow of 

 19,165,041 gallons per day, or showing a minimum flow 

 of about 20,000,000 gallons per day from the drainage 

 area of 323 square miles." (Mr Taunton's measurement.) 



" This flow gives nearly 7 cubic feet or 44 gallons per 

 square mile per minute. Possibly the ordinary summer 

 flow may exceed this to the extent of from 50 to lOO per 

 cent, or 30,000,000 to 40,000,000 gallons per day, ordinary 

 summer flow." 



"Assuming, however, 12 cubic feet or 75 gallons per 

 square mile per minute for the 323 square miles of 

 drainage above Lechlade, this would give a flow of 

 34,884,000 gallons per day." 



But taking the smaller flow of 7 cubic feet, or 44 gallons, 

 per square mile per minute this would fairly represent the 



