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<br />'. <br /> <br />. <br /> <br />. <br /> <br />PRESSURE PIPELINE SYSTEMS <br /> <br />The two pressure pipeline systems used are sprinkler and drip. <br />Permament solid-set sprinkler systems appear to be most adaptable <br />on sandy soil where the intake family curve is greater than 2. A <br />border system costs approximately one-third to two-thirds of a per- <br />manent underground sprinkler system on soils with an intake family <br />curve of less than 2. Also, there is an additional pumping cost <br />associated with sprinkler systems. Irrigation efficiency in the hot, <br />dry climate for a border system with good water management is <br />usually higher than for a sprinkler system. However, systems are <br />selected on an individual basis depending upon the farmer's choice, <br />soil, land eapability, and the cost of installing and operating the <br />system. <br /> <br />Drip systems are of two major types - drip, which refers to very <br />low volume flow emitters ranging from 1 to 4 gallons per hour. and <br />bubbler, which ranges from 30 to 60 gallons per hour. <br /> <br />There are now three drip systems installed on 167 acres. A reser- <br />voir is used to regulate the flow and to settle out and screen solids. <br />The storage capacity will provide about 1.5 hours of pumping time. <br /> <br />The removal of solids is necessary. The water contains a large <br />volume of suspended solids mainly because of canal cleaning during <br />the summer months. Downstream from the pump, a filtration system is <br />installed to remove additional particles. A gas chlorinator is in- <br />stalled to reduce algae growth in the system. <br /> <br />IRRIGATION WATER MANAGEMENT <br /> <br />Success of the onfarm irrigation improvement program depends on <br />the individual irrigator's knowledge and practice of irrigation water <br />management. Good water management requires a knowledge of soil <br />characteristics, flow rate, application time, border size, crop re- <br />tardance, net amount of moisture needed by the crop, and frequency of <br />irrigation. The level of understanding by irrigators varies con- <br />siderably from those with practically no knowledge to those with a <br />good grasp of the various factors. Another item that influences the <br />success of the program is the tenure of the irrigator. The irrigator <br />you work with this year may not be the same person you work with next <br />year; consequently, continuing technical ~s3istance is impor~a~t. <br /> <br />We h~ve developed guidance rnat~rial to assist t~e faL~.e~s in <br />water mcnagement. s~s provides the fa~er with a water man2sement <br /> <br />-6- <br />