ECONOMIC DESIGN AND ANALYSIS OF
TRICKLE IRRIGATION LATERALS
Ahmed I. Al-Amoud, Helmi M. Hathoot and Ahmed S. Al-Mesned
Dept. of Agric. Engrg., Col of Agric., Grad. Stud. Dept. of Agric. Engrg.
King Saud Univ., Riyadh, Saudi Arabia Col., of Agric., King Saud Univ.
This paper addresses the economic and environmental technical design of trickle irrigation laterals of constant slope and individual equally spaced emitters. The land topography, slope and irrigation water temperature reflect the impact of environment on lateral design. In the present analysis the change of the velocity head and the change of momentum along a lateral are considered. Friction loss is estimated by using the Darcy-Weisbach equation taking in to account the proper choice of the friction coefficient equation according to Reynolds’ number. A new computer program for estimating lateral discharge, emitter discharge and pressure head distributions along a lateral is presented. The program provides results close to experimental data (obtained from literature) though it is much simpler than other previously presented programs. The program is developed to be used for designing lateral’s economic diameter or length within a high level of distribution uniformity. Two numerical examples for different cases of economic design are provided.