161 



tolerably even, as in plate 1 ; but if the 

 surface be very uneven, they may be 

 made irregularly along the higher parts 

 of the ground, The distance of these 

 gutters from each other, must be deter- 

 mined by the abundance or scarcity of 

 water. When water is plentiful, they 

 should never be made at a greater dis- 

 tance from each other than ten yards; 

 but when it is scarce, it is necessary, in 

 order to strain the water to the utmost, to 

 cut them at nearly twice this distance, or 

 to make one gutter where two are desire- 

 able. It is to be observed, that these 

 gutters are to be made with the same 

 regular descent as the feeders, and that 

 both become gradually narrower as they 

 proceed, as in the plates ; for the quantity 

 of water becomes less and less, by some 

 flowing constantly over the sides, and some 

 being drawn off by the smaller ditches. 



Thp 



