ABSTRACT A model for hydraulic design of drip irrigation lateral is developed by applying the theory of spatially varied flow. A block-scheme is made by using SIMULINK-MATLAB for solving the determined two differential equations. As a result diagrams for distribution of lateral flow rate, pressure head, head loss, emitter discharge for each dripper along the pipe length and some other characteristics are obtained. The influence of the temperature on the kinematics viscosity of water is read by a coefficient in the formula of Darcy-Weisbach for head loss due to friction. The friction coefficient is reported as a function of Reynolds number. The coefficient of Boussinesq is determined for laminar and turbulent flow conditions. The developed model of hydraulic design of drip lateral is compared with experimental data for Israeli Netafim Thyphoon 16250 with emitter discharge q=1.75l/h and spacing between emitters 0.30m.