The multi-outlet pipelines normally called as lateral lines
are the major important components of the micro irrigation and sprinkler
irrigation systems. To maintain the allowable discharge variation of the
outlets, the variation in pressure along the length of the pipelines due to
frictional head loss and elevation is restricted within a specified limit. In
this process, the accurate computation of the inlet head of the lateral lines
becomes necessary for proper design of the system. The generally used formulae
of computing the inlet heads involve different values of coefficients quoted in
literature without proper justification. This leads to over or under computed
values of the inlet head. In this paper, equations are developed to accurately
compute the value of the inlet head of lateral lines. The equations are based
on the mathematical series of varying discharge from one outlet to other. The
equations are simplified using mathematical logics and finally obtained in the
compact forms to be used with the exponents of flow and diameter of different
frictional head loss formulae. The verification and application of the formulae
are illustrated with the standard example problems. The developed formulae can
be easily and accurately used for computing the inlet head of lateral lines of
micro irrigation and sprinkler irrigation systems.
Author(s) Details
Atish Sagar
Division of Agricultural Engineering, Indian Agricultural
Research Institute, New Delhi, India.
Prashant Singh
Division of Agricultural Engineering, Indian Agricultural
Research Institute, New Delhi, India.
Pankaj Malkani
Division of Agricultural Engineering, Indian Agricultural
Research Institute, New Delhi, India.
Please see the book here :- https://doi.org/10.9734/bpi/etert/v5
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