ON THE CIRCULATION OF UNDERGROUND WATERS. 



311 



from the filter-beds of the Corporation Sewage Farm ; it is not proposed 

 to pump from the boring, but from a shaft about 100 feet nearer the farm ; 

 the dip of the very jointed and open Lower Keuper sandstone is about 

 south-east or from the farm towards the shaft, which is, moreover, 16 feet 

 below the filter-beds, which are 9 acres in extent, and receive no les.s 

 than two million gallons per day of sewage. 



Glamokganshjre. 



Information from Mr. J. Stokrie, The Museum, Cardiff. 



Cogan BricJcivorJcs Boring, 1885. 



Ft. Ft- 



201 Red marl, grey bands 201 



202 Green marls 1 



312 Red marls 110 



313 Green marl ......... I 



338 Red marl 25 



Coarse grit ( + ) 



Water at 338 feet. 



The Dumhalls Boring, near Cardiff. 



Ft. Ft- in- 



456 Red marls 456 



502 Conglomerate . . 46 



Old Brewery, Cardiff. 



331 Marls 331 



Conglomerates . . . . . . . . ( + ) 



Water 326 feet, stands at 40 feet from the surface before pumping, 

 pump placed at 120 feet from the surface. 



The Ely Brewery Co., near Cardiff Station, 2.\ miles from Cardiff. 



Ft. . Ft. in. 



186 Marls 186 



190 Conglomerates *( + ) 



Water at 181 feet. 



Appendix. 

 Jjist of Questions circulated. 



1. Position of well or shafts with which 



you are acquainted. 

 Irt. State date at which the ■well or shaft 

 was originally sunk. Has it been 

 deepened since by sinking or 

 boring, and when ? 



2. Approximate height of the surface of 



the ground above Ordnance Datum 

 (mean sea leveH ? 



3. Depth from surface to bottom of shaft 



or well with diameter. Depth 

 from surface to bottom of bore- 

 hole, with diameter. 

 Za. Depth from the surface to the hori- 



zontal driftways, if any. What 

 is their length and number ? 



4. Height below the surface at which 



water stands hefore and after 

 pumping. Number of hours elaps- 

 ing before ordinary level is restored 

 after pumping. 

 4a. Hiight below the surface at which 

 the water stood when the well was 

 first sunk, and height at which it 

 stands now when not pumped. 



5. Qitantity capable of being pumped 



in gallons per day of 24 hours. 

 Average quantity daily pumped. 



