NURSERY PRACTICE FOR PRAIRIE-PLAIXS PLANTING 65 



MAIN DITCH 



z> — — \\f 



CANVAS DAM 



D/VER.S/ON CHANNEL O/Z BOX 



I t t 



JL 



LISTER OR PLOW FURROW 

 TREE ZOWS 



METAL SLIDE 



Figure 15. — Method of diverting water from main ditch, by means of canvas 



dam and diversion box. 



/4- OUNCE CANl/AS^ 



Figure 16. — A canvas dam constructed so as to permit bypassing part of the 



water. 



297878°— 41 5 



