\YATEII-BEAR1NG STRATA. 3S3'. 



water througli its interstices, owing to its having a line of 

 least resistance, and a well sunk in such chalk would deliver 

 water more freely than the other. 



Wells sunk in chalk always get a free supply of water from 

 the Upper Flint Beds, where the underground spring water is 

 flowing to some natural outlet, say a river or spring ; and as 

 sinking is continued, the water has a very slow movement 

 through the horizontal fissures, and comes up milky ; but as 

 before mentioned these fissures are opened by pumping, and 

 a freer circulation and issue is set up. 



Around London and at Wokingham, the wells are sunk 

 to a depth of from 300 to 400 feet, the chalk bed being about 

 650 feet in thickness. 



The wells at Trafalgar Square are 395 feet into the chalk, 

 yielding 500,000 gallons per day. 



The New River Company, London, pump very largely 

 from the chalk, as also do the Kent Waterworks Co. (the 

 latter entirely) from wells at Deptford, Woolwich, Chisel- 

 hurst, Crayford, and Dover Road. 



The New River Company have numerous wells between 

 London, viz., at Amwell Road and Am well Hill, and along 

 the line of the New River into Hertfordshire, via Brox- 

 bourne and Hoddesden. 



The water from these wells is for the most part delivered 

 into the New River, close to which they are situated. This 

 forms an open conduit terminating at the Company's station 

 at New River Head in storage ponds, tlie site of the original 

 works formed by Sir Hugh Myddleton 280 years ago. 



This Company delivers into their district from these- 

 wells and the Lea River an average daily supply of thirty 

 million gallons, and the Kent Company seven to eight 

 millions. 



The chalk wells and springs singly yield from a minimum 



