WorldWide Drilling Resource

61 WorldWide Drilling Resource ® JUNE 2015 ! % Call the CGA of1ce (707) 578-4408 for details and early registration. www.groundh2o.org Silent Auction ! " $ ! ! # ! $ ! Seminars - Thursday and Saturday Knowledge for Business, Drilling, Pump, Water Treatment, REHS, Safety, and Technical Subjects Trade Show – Friday Product Spotlight Demonstrations, Lunch on the Showroom Floor Basic Irrigation Terminology Part 2 Adapted from Information by Rain Bird Corporation and Washington State University D Deep Percolation - Movement of water through soil below the root zone. This water is used by plants and eventually ends up in groundwater. Diaphragm - Rubber seal which keeps water from flowing through the valve. Diaphragm Valve - A globe or angle pat- tern valve which uses a diaphragm to control the flow of water through the valve. Distribution of Uniformity - This test determines the uniformity of irrigation water over an area. High distribution uni- formity is obtained when an equal amount of water is placed on all areas of the landscape. Domestic Water - Potable or drinking water. Although it can be used as a source of irrigation water, once the water enters an irrigation system, it is no longer con- sidered domestic water. Drain Valve - Avalve used to empty water from a lateral or main line, usually for winterization purposes. Drip Irrigation - A low volume watering method which delivers water slowly and directly to the plant roots for maximum efficiency. Dynamic Pressure - Also called work- ing pressure, this is the pressure of the irrigation system during operation. E Emitter - Small watering device, also called a dripper, which delivers water at very low rate used mainly in drip irrigation. Evapotranspiration - Often referred to by its acronym ET, it is the amount of water lost due to evaporation from the soil and transpiration from plants. Smart con- trollers are sometimes able to use ET to determine the amount of watering nec- essary for a particular landscape. Check back next month for more Basic Irrigation Terminology !