Studies on Economical Sprinkler-Irrigation Systems

(1) Determination of the Most Economical Diameter of the Pipe Line

Abstract

1 The relation between the capital and operating cost required for sprinkler-irrigation and the diameter of the pipe line available for the system has been investegated.
2 The most economical diameter of the pipe line for sprinkler-irrigation will the approximately calculated by the following equation, within
the limit of q≤500l/mim.
d=0.172N^0.156q^0.47
where, d is the diameter of the steel pipe line (cm), N is operating hours all the year around, and q is the water discharge of sprinklers
3 The most economical diameter of the pipe line for the small-scale sprinkler system, which has been designed and practically used by Japanese farmers, is calculated by the equations under various conditions such as changes of the discharge, operating hours all the year around, the diameter of the pipe line and so forth. The results studied with these factors are illustrated,
4 The auther discussed as to the method for the most economical sprinkler-system.