The design of economic micro-irrigation laterals by computer aid / [electronic resource].

Includes references.

To design micro-irrigation laterals, by an accurate, simple and quick
method, The OPT-LAT model was created. The model calculates the
maximum lateral length with field length in x-axis or y-axis at different
lateral diameters. It can also estimate the optimal diameter that meets
least cost irrigation system. Not only that, but also it can compare
between optimal lateral diameter in x-axis or y-axis. The validity ofOPTLAT
model was proved through the comparison between the lateral
lengths calculated by the model and the corresponding ones calculated
by Osama (2). The model has been applied on 160 m x 120 m plot area
as a case study. At the x-axis direction, the lateral lengths were 58 m for
different lateral diameters, the optimal internal diameter was 13.6 mm at
annual least cost of0.229 L.E/m/year and less percent ofpressure head
variation {?( 12 % at lateral diameter of 36 mm. The corresponding
wtlues at y-axis were 78 111 lateral lengths. the optimal internal diameter
was 13.6111111 at annual least cost of0.239 L.Elmlyear and less percent of
pressure head variation of 12.04 % at lateral diameter of36 mm. These
results indicate that as the diameters of the laterals increased, the
percent of the pressure head variation decreased, annual fixed cost " increased and repair plus energy annual costs increased. The above
results depend on energy price and pipe price according to its material
type.

Summary in Arabic.