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<br />:?ig!.lre 6 gives head loss gradients as ~unctiOLls 0':: i::'ow r&t~ ilj': va-.::.::..c.......6
<br />~-,ose cii&.;~le~ers. To find the head loss for the desired flow rate for b.
<br />given diameter hose, ~ultiply the head loss grb.dien~ iOund iG tile ~i6~;:2
<br />oy the length of the hose.
<br />
<br />With ~he elevation of the water supply (~cusuLed r2':ucive ~o the
<br />~eierence level), and the head losses for e~2h S2Ct~o~ 0: ~~~~~~: ?~~2
<br />oe.!::.1;v2e:: hose outlets and across each deliv8::-y L10se d2l::erfLi.ineJ, tli.~
<br />c.e=-'::"very 'i:loses are ready to be attached to 8<lch tree. T~.2 :;0,-<1 ::3 :":0
<br />e~=--.-,-,:':"~..ate head losses down tnc lateral by u.djusting t~-.t2 outiL1\v (:':c:v~.-
<br />c.:'::"oas so that each delivery hose has th2 S.J.L-'2 ';-.ead loss L.L.~GSS i. t.
<br />"::;.2 :.:irst pair of trees, the outlet of tLc. c:.elivery ho.'-:.c is &.::a.c~-.t2,-:
<br />,-:.1 e2.2v&.:io~ lower than that of the water sou-::'-ce oy a '::'is~&;-.c.l: 2C~U~.-=- :':c
<br />.:i-le Sl....~;, of (1) the head loss in the l<ite.ru.1. i:;::-O~,l t;12 \vdcer sou-.:cc L0 :-;,-..;
<br />:~-.:s-:: ~-!OS2 connection, and (2) the head loss in tne d.e~.ivc~'y :,OJ~. ~\__
<br />Q~C~ sub5e~uent pair of trees along the ~d~2~ul, t~2 outlet 01 ~~2 U~L~V-
<br />e~y ~Gse ~3 lowered an additional distance, equal to tDe udGi~~OD~~ ~~~~
<br />~oss ~~ ~ne lateral.
<br />
<br />v~-.c.e -Lne ~loses are attached. to the -'::..:'2"::_;:;, c... iLlO:ce precise, 0yuG.mi..:
<br /><C.'-.J. ;....SL~>2_~1t of the outflow elevatior..s a:: l2CiC:l -cree. can be mace w~~-;:r. -.::......;
<br />:-:>~'3':21r. Ci)e:cating. This is done by rais~l--:'~ L'......crL :.OS2, one at a til;'-12, "':'-'
<br />__>.1.(; iloint h'here water ceases to flmv, Clnc. t:-.l.en measuring dO\\111 i:co;r, -L~"'':'';:;;
<br />~::'o~~'.~ C;. ci.istance equal to the desired [-.e.:~G loss across the delivery
<br />~~C52, G.i1d relocating the delivery hose oULlet at this elevation. .L.L,--'--=>
<br /><'-H,-,;-,-.ic calibration assures that eucr. de:~vl2ry hose llas the Scu.lle h2<-~;::;'
<br />~us~ ucross it, eliminating errors introduced by imprecise estiwates
<br />O~ ~~~~ loss in the lateral.
<br />
<br />-,,-,12 field emission unifollTIity
<br />:.('::l-':;i,el:i. ur~d Keller, 1975) caicu-
<br />~::.;:eG. i':Oill measurements of the flmv
<br />~~,__.-..:L' ':::01,1 each delivery hose ror the
<br />'_~\__...:.:c.u.j Arizona system, Has 89.2% be-
<br />~J::2 ~~e dynamic calibration was mace.
<br />:~"c, ;,.,2c..sureillents were made after the
<br />c::..~_::d)-.:ation.) The field emission uni-
<br />:or~i~y ror the Riverside, California
<br />~YS=2~, wcasured after the dynaffiic
<br />C2_~~~2tio~, was 97.3%. This is ex-
<br />~:':2;:-:,c~Y ~igh as compared with comrr.er-
<br />2~~~ ~::rigution systems. The major
<br />L-:..v~..-':ug2 of tr~is system is that the
<br />G~.__~2":S are simply and individuaily
<br />~~~~3=able. The fact that flow is
<br />~u~:-.:o:ied by height of the outlet
<br />~-c.-':.,2:': tt.an by an orifice should
<br />~~su~e that it remains constant.
<br />
<br />A convenient way to attach the
<br />l..:.::':'V':'xy hose to each tree is srLoWi1
<br />u~ ~"""o' 7. ^ plastic, barbed-tee
<br />C~Lt~~g is stapled to the trunk wit~
<br />
<br />Pigure 7.--view or supply ;~O.j'~,
<br />Qt~~ched to the trunk of a ci~~~J
<br />Lr~c. The tee connector is
<br />stc.1plcd to the tree at the C:"':~~~\_'.
<br />elevation or outflow.
<br />
<br />,
<br />-,,-
<br />
<br />OC2968
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