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CAN BE TESTED BY DIRECT MEASUREMENT OF THE EMITTER <br /> DISCHARGE RATES . <br /> C . THE APPLICATION UNIFORMITY CAN BE DETERMINED BY <br /> COLLECTING FIELD DATA AND CALCULATING THE COEFFICIENT <br /> OF UNIFORMITY ( UC ) USING EITHER THE CHRISTIANSEN OR <br /> STATISTICAL UNIFORMITY COEFFICIENTMETHODS DESCRIBED <br /> IN THE FOLLOWING SECTION . FOR SPRINKLER SYSTEMS , A <br /> MINIMUM OF THREE LOCATIONS WITHIN A ZONE SHOULD BE <br /> SELECTED FOR DATA COLLECTION . THESE LOCATIONS SHOULD <br /> BE SELECTED NEAR THE BEGINNING , MIDDLE AND END OF THE <br /> SPRINKLER LATERAL . FOR MICROIRRIGATION SYSTEMS , A <br /> MINIMUM OF 18 TO 24 DATA POINTS OR LOCATIONS SHOULD BE <br /> RANDOMLY COLLECTED ACROSS THE FIELD BEING EVALUATED . <br /> IF THE RESULTING COEFFICIENT OF UNIFORMITY IS LOW , THEN <br /> ADDITIONAL FIELD DATA SHOULD BE TAKEN TO IMPROVE THE <br /> STATISTICAL RELIABILITY OF THE ESTIMATE , <br /> D . UNIFORMITY COEFFICIENTS SHOULD BE CALCULATED USING <br /> THE CHRISTIANSEN UNIFORMITY COEFFICIENT CU GIVEN IN <br /> EQUATION 10 OR THE STATISTICAL UNIFORMITY COEFFICIENT <br /> CUS ) GIVEN IN EQUATION 11 , FOR RANDOMLY DISTRIBUTED <br /> DATA, BOTH METHODS WILL PRODUCE APPROXIMATELY THE <br /> SAME RESULT . <br /> FLOW UNIFORMITY FORMULA (CHRISTIANSEN ) <br /> CUc = ( 100 ) [ 1 . 0- ( EX/MN ) ] <br /> WHERE : <br /> CU = CHRISTIANSEN ' S UNIFORMITY <br /> COEFFICIENT ( PERCENT ) WHICH <br /> RANGES FROM 0 % ( LOW UNIFORMITY ) TO <br /> 100 % ( PERFECT UNIFORMITY ) ; <br /> N = NUMBER OF MEASUREMENTS , <br /> OBSERVATION POINTS , OR CALCULATED <br /> WATER APPLICATIONS AT POINTS <br /> BENEATH THE IRRIGATION SYSTEM , <br /> M = THE MEAN VALUE OF ALL OBSERVATIONS , <br /> AND <br /> EX = THE SUM OF THE DEVIATIONS OF THE <br /> INDIVIDUAL OBSERVATIONS FROM THE <br /> MEAN VALUE . <br /> FLOW UNIFORMITY FORMULA (STATISTICAL) <br /> CUs = 100 %-80 % (S/X) <br /> WHERE : <br /> CUs = THE STATISTICAL UNIFORMITY <br /> COEFFICIENT ( PERCENT ) WHICH RANGES <br /> FROM 0 % ( LOW UNIFORMITY ) TO 100 % <br /> ( PERFECT UNIFORMITY) , <br /> F :\Engineering\Special Projects\Eagle Trace Phase Montract Documents\Eagle Trace Subdivision Phase <br /> II\IRRIGATION SPECIFICATIONS from W. F . McCain .doc - 14 - <br />