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<br />-3- <br /> <br />~,... <br />CJl <br />o <br />~~l <br /> <br />Number of Emi tters ~ Tree ' <br /> <br />The desired root system is about 40% of the area alotted to each <br />tree. Thus, the area of the root system is <br /> <br />20 X 20 X 40% = 150 sq. ft. of root area <br /> <br />The soil is Ravola Clay Loam so a radius of wetted circle from the <br />emitter is 4 feet to 5 feet. Therefore, <br /> <br />150 sq.ft. root area = 3.18 emitters/tree <br />42 IT sq.ft. afea of 4' circle <br /> <br />Four emitters per tree were used to ensure an overlap, of water going <br />down through the soil to leach out the salts. <br /> <br />Size of Emitters <br />-- <br /> <br />The peak consumptive use 'is about 40 gallons per day per tree. <br />Therefore for each size <br /> <br />40 <br />4 X 1 gal/hr <br /> <br />= 10 hou rs <br /> <br /> <br />40 <br />4 X 1.5 gal/hr = 6.6 hours <br /> <br />40 <br />4 X 2 gal/hr = 5 hours <br /> <br />The one gallon per hour emitter was satisfactory for our operation. If <br />we were going to irrigate a larger acreage, we could use the two gallon <br />per hour emitter. <br /> <br />III. Plan' of Emitter Line Example <br /> <br />, Line Number 1 of Field E is 250 feet long and, is on a grade of <br />one foot per 100 feet. The objective is to arrive at a friction head <br />loss in the line that will overcome the head gained in grade. Since there <br />is an emitter every four feet, a length of 100 feet will have 25 emitters <br />and also 25 GPH. Therefore, <br /> <br />average flow from 250' to 150' <br /> <br />= 25 + 0/2 = 12.5 GPH = <br />.273 psi for DH 375 hose1 <br /> <br />lpage 9, Drip-Eze Tech Manual <br />