Chap. p. WATER-WORKS. 303 



cover their Strength 5 which the Surveyor 

 ought to be well informed of, becaufe on their 

 Qiiantity depends his good Succefs in Water- 

 works. 



The next Care is, to draw this Spring into 

 feme Refer voir 5 but let it not be too near the 

 main Head, but rather at two or three hun- 

 dred Yards Diftance. 



This Refervoir ought to be in Proportion 0/ ^ Re- 

 to the Quantity of Water you want, or the f^*'^^^*'- 

 Strength of the Spring, at leaft 100 Yards, 

 but if 2, 5, or 400 Yards, ftill the better : 

 If they are cut out of whole Ground, they 

 are commonly circular, and ought to be well 

 clayed, except the Hill abound with Water. 

 But it may be poflible there is fome Hollow 

 or Valley in the Hill^ then a Head made 

 with the finking, widening, and clearing of 

 it will do, and fave a great deal of Money 5 

 but there fhould be a Trench dug down in 

 the middle of the Head, about a Foot wide 

 or wider, and forae ftrong Clay well ramm'd 

 down, or elfe the Water will foak away thro* 

 the Head 5 and this Trench ought to be cut 

 down lower than the Bottom of the Refervoir 

 or Pond. 



But perhaps you have Water enough for of Foun- 

 Canals, Fifh-Ponds, &c. near the Houfe, ^^''«^- 

 then there will be lefsOccafion for fo great 

 Qjaantities 3 and the chief Ufe will be for 

 Jed'eaux or Spouts of Water in Fountains: 

 In which we muft obferve, that this Refer- 

 voir will throw Water thro' a Pipei. of an 



Inch 



