116 



IRRIGATION. 



forward of the pendulum will show the grade to be correct. 

 When the waters of springs, such as are now under 

 consideration, are to be used directly in irrigation, the 

 method shown at fig. 53 may be applied. The springs s, 

 s, s, may be opened or cleared of rubbish, and may be led 

 directly into furrows following the lines of level shown by 

 the dotted lines. Or they may be led into the larger 

 springs and the collected water be discharged as shown 

 at 8, S. Or several springs near the center may be 



Fig. 53. DIRECT USB OF SPRINGS. 



gathered into a pool or reservoir, and the others led into 

 it, and the whole supply be discharged into a main fur- 

 row following the level as seen at fig. 54, in which the 

 springs are seen at s, s, the reservoir at R, and the irri- 

 gating channels at c, c, c. 



By this management the drainage of wet, arable lands, 

 also may be made to furnish a supply of water to irrigate 

 meadows, and the instances where such a combination of 

 advantages may be availed of are far from scarce or few. 

 Indeed the swamps that now produce very inferior herbage, 



