Plate 8

KEYLINE-PATTERN FLOW IRRIGATION AND ITS RESULTS

 

   Upper left: Over 100,000 gallons an hour flowing and watering evenly from a newly-constructed drain on to first-time-irrigated hill country planted the previous day.

   Middle: The lesser amount of water, 25,000 gallons, effectively irrigates moderate slopes but does not have sufficient volume for quickly irrigating flatter slopes. The result of this irrigation in sandstone country on "Nevallan" quickly produced the growth of white clover. For identification, note the same tree in the middle and lower pictures.

   We have found that Keyline-pattern is more efficient in water use than furrow irrigation, which in turn generally provides more effective water use than spray irrigation.