f. YORKSHIRE. 153 



depth is about feven feet : if forty diameter, 

 the depth is about five ; — before the coats of 

 clay. Sec. be laid on *. 



The firfl bufinefs in fetiing out a refervoir 

 is to take the level of thefite, and drive piles 

 as a guide in forming the banks -, and in ma- 

 king the conducting channel, and wafte wa- 

 ter-place 



If the fituation be on a f,ope, the excavat- 

 ed mould is ufed in forming the bank on the 

 lower fide : if nearly level, the mould re- 

 quires to be removed, or (if laid round the 

 edge) the condu6ling channel to be railed. 



If clay or ftone be excavated, it is laid 

 feparately afide to fave carriage. 



If the lower fide be raifed with the exca- 

 vated materials, they ought to be firmly 



worked 



* A refervoir fet out twenty-two yards diameter, by 

 feven feet deep, will, when finiflied, meafure about 

 fixty feet by ux, and vv'iU hold about two hundred and 

 ten cubical ) ards, or near feven hundred hojflieads of 

 water. Forty feet diameter by four feet deep, when 

 finiflicd, contains fixty-two cubical yards, or two 

 hundred hogflieads (of fixty-thrce gallons, wine rae;i- 

 fure). 



