Trickle irrigation is a system for supplying filtered water and fertilizer directly on or into the soil. Spraying is eliminated and water is allowed to dissipate under low pressure in an exact predetermined pattern. The outlet device which emits the water into the soil is known as an "emitter." Emitters dissipate the pressure in the pipe distribution networks by means of a narrow nozzle or long flow path, thereby decreasing the water pressure to allow discharge of only a few liters per hour (gallons per hour). After leaving the emitter water is distributed by its normal movement through the soil profile; therefore, the area which can be watered from each emission point is limited by the constraints of the water's horizontal flow. In trickle irrigation the objective is to provide each plant with a continuous readily available supply of soil moisture which is sufficient to meet transpiration demands. Trickle irrigation offers unique agronomical, agrotechnical, and economical advantages for the efficient use of water. The main disadvantages of the trickle irrigation systems are sensitivity to clogging, salinity build up, and poor soil moisture distribution. The material which follows provides an outline and sufficient detail for trickler system design using the limited knowledge currently available.