402 



APPENDIX. 



soils, be 3 feet wide at top, feet at bottom, and 2 J feet 

 deep, and from 18 to 24? feet apart : these from their size, 

 though there be but little water running in them, Avill 

 remain a long time open. 



Fig. II. Represents the method of draining lands, 

 where the wetness arises from springs. The dotted lines 

 shew the line of springs. 



Fig. II. 



Dry porous high bank. 



Dry porous high bank. 



Cut a main drain along the lowest line of level, as AB, 

 of sufficient dimensions, and from the springs Nos. 1, 2, 

 3, 4, rising at the bottom of the bank, and seen on the 

 plan, cut conductors leading into the main drain, of suffi- 

 cient depth to contain the water issuing from the springs ; 

 but should the gi'ound be very unequal, and the springs 

 numerous, it may perhaps be necessary to make a main 



