r **s i 



a new cavern and well would have been 

 more confident with the firft deiign, and 

 have anfwered the wifhed for end in a more 

 fure and regular manner: And if very great 

 floods (fuch as never yet happened) are to 

 be guarded againft, the new cavern, or fub- 

 terrane, might have been large enough, 

 occasionally, to admit the water difcharged 

 by more than one well ; on which plan fe- 

 veral might be made to be kept plugged, 

 like the forcing, ones at Qjmd T, and to be 

 opened only in floods. Upon this principle, 

 fuch additions might be made at Y and Z ; 

 the dotted lines there, mark a fuppofed new 

 channel into the Medlock, and a fubterrane 

 to another well. 



As the depth of water upon L is only 

 fifteen inches, it certainly would be no dif- 

 ficult matter to effecT: this addition; the 

 water might cafily be fenced out by mafonry, 

 around a fpace to work in, and the paffage 

 might be carried on, and arched under 

 ground. 



Another point, in which thefe works fell 

 fliort of expectation, is the effect of the fub- 

 terraneous drains; it was imagined, that 

 the fuperrluous water through thoie drains, 

 would, at all times, freely flow into the 

 Medlock at U; but inftead of that, the water 

 of the Medlock as often flows into the drain, 

 which has very bad coniequences, for it 

 totally counteracts the principles of a 

 drain, and likewife flows back fo ftrongly 



p 4 



