THE FLOW OF WATER IN IRRIGATION CHANNELS. 
57 
\»: 
00°* 
6 
o 
vO v- <£> C\ O .0° 
6 6 6 o ~ 
V= Velocity in feei per second. 
o ^\ 
Fig. 8.— Chart for use in designing rough masonry, rough-coated concrete, or earth channels. From 
intersection of R and n follow guide lines to intersection of S and V. 
