The base system is an orchard drip irrigation system with buried emitters (most systems of this type in Georgia are on pecans). The system has little or no pressure control and non-pressure compensating emitters. There are currently 800 systems in Georgia similar to this description. Systems without adequate pressure control will typically have pressure variations which cause areas of high pressure to receive more water than areas of low pressure. In order to supply adequate water to the areas receiving the least amount, other areas tend to get over-irrigated. The recommended practice calls for no more than a plus or minus 10 percent variation from the average emitter pressure when non-pressure compensating emitters are used.