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<br />WAT[H TRANSFER:
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<br />AnnIV",I,
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<br />AI'I'IJr:-,\NTS AN\) OIlJEtlORS
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<br />f') 10,,7
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<br />IV"II ^ W,dl"l, M. Af,CI' I"ul J'II1 Alwlllllllnll,
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<br />~~ 17,500 acres Wilh 47 % 0' the WOller righlS In W:llr.r SUPllly lln[l~tolaOll
<br />r;Company [WSSCI. Tho.loton npplicd 10. the Dislficl WOler COUll to. chanOt!
<br />~jlhe use af 11m waler rights IIam ao.icurttltalllse to "'unidpa/llso. 1his
<br />:'Plipcr Is limited 10. n discussian 0.1 malo. camponnnt, 0.1 I/IB change 0'
<br />l~w8ler rlghls beginning at Ihe individuallarm hendgllles nnd ending al lhe
<br />'l 'bOllo.m af the IHigated 'ields. These Include the rarms's water Supnly,
<br />IWR, irrigotion applicalion elficiencies and percent 'oss 10 SIll face runo"
<br />: 'and deep pcrcala\lon. Tho histolical On.'a'm us/! 0.1 the w.l11'1 rights was
<br />: analYled by Thornton's engineers and consultants !Tho.rntanl ilnd provided
<br />to objecto,s. Objeclal, Narthern Wllter Co.Io.rado Waler Conservilncy
<br />District INCI, nnn its cansuIUlnt,W. W. Whoelor & Assaclnlos IWWWI
<br />Inllltltod nn nnnlynl., 01 Thornton'n Undlno' In /lnlnfrnlntl wh"ll1U1 Thfllll'
<br />ton'a 1I1'IOllcIlj liS" I"'"ly~l~ W1lS 'Ilprosnnlnllvo. NC&www round 111111
<br />~ Tho.oton'S nnnlysls wns no! rcnresr.nl,hlVO nnd prc[l'iHed an indenondenl
<br />"anaIYSis.
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<br />Ahstl.lCI "}o.'r.
<br />'d
<br />Two llllhJll~"t nll,lIy~,'s or u'" I"SID''';..! on In"" r.on5uIllPtlv~ uso 8it"
<br />returll rlows of nil,iculllHalwillN ,inhts In NO'lhcfflCola/ndoare dIS.C\1mFa.
<br />Tll' City or Thornton plllf\S lhc lIans!('r or the w<llc' "gilts Irom B!JIlCU U~
<br />to ~IUnic.IPnl \lSO. Thornton'S r>nU'nr>Ming 0/1110 tuslOTlcnl on.I:II~usa.:(
<br />thr. Wille, lights wns Hnaly/ell by Ih... NOIlIlI)lIl cOloradlo wa'~~;:;~h
<br />C DC, ." (NC\ and W. W. Wheelc, & A5SoClat'~s, nc. .......
<br />VallGY 15" . . the dilfc,en\ proe
<br />found 10 he not representatlvo. Tills paper discusses. .' 1
<br />dUfes used 10 QU1Hllily c,op potl~nli1J1 cVi)Potr<1nSP\r~lIon. (Elpl, rr/lga!I,
<br />willcr renuhelllentllWRI ilnd u,ignlion .lPllliC<l1lon effiCienCies. Tho aVC~5g0
<br />'. ., '. 5CS.OC and Tfl21 10 be;r
<br />ilfltlUill IWR was eSllrTlatr.d hy TltlHlllOn uSing .' ..
<br />NC. www 1I1;!tlOd ,e'e,enr.r.: crop EIIl in a d.lily SOil mOlslur.8.bu111
<br />mm. ... 00 nOlan's Irrlgall
<br />_,'C, "',imalr.:d 11lC I\NR to rim{le hum 3,15 to 3 mill. l,n , I':'
<br />u UL" , I r ndrunof w~
<br />aI/plication e'flciencies nntl pClcenl lost I(J (lcep pe'co. a lona 'd
<br />I ascd on SCS dcsign handlJouk with nOIl'Slto speclhc dala assumd, II.c d
<br />' . c, II fKF.WWW men sure , 0
<br />vahles in the deSign llljlJilllO'IS allu la I es. I fli Jl!ncr~~
<br />elliclencles and irrigation pa,aOletnrs alll! lound Ihat ilClua e c
<br />were fnll<;h lowe. Ihan Tho,nlon's cstlflliltcll values and Ihat se~c/!l_,
<br />lhornlon's assumlltiorls were nOI valid. The results 0' Ihe .two dj!.~t~
<br />analysos Wllrll IIHlt Thornton cstllnatcd JuslO/ical Co.nSumptlve us~.to.
<br />1<1,880 ,1CIC h!r.I; NC&WWW cstlmllled it to be 10.032 acre lee~
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<br />W.lll~Uh'Pl)IY-il.illLSIQ.!;Ig~_nl~. Tho WSSC SySlrm inCludes 11 11
<br />reservoirs. <1 tran~mollnlaln divc'sion 5lrUCtllfrs, a 58 mile rong main canal
<br />and several laterals. Histo,ically. WSSC's river heallgallJ lliversions have
<br />:Ilver<lgcd about 76,168 acre Ice I. Willer is d('livered to sha.cholders at a
<br />ielatively constant lale. 0.71 c's pel share. Allor tho irrigation 5e.1S0n
<br />begins, water is genelillfy delivered on a weekly schr.dule n' ellhr.r 5 days
<br />on & 2 days 0", 01 <1 d<Jys on & 3 days orL When the dllCh is delivering.
<br />lI'shil.ehalderei1lIe, usa thei, !?nlille01ent or IDSI' il. 1hQ WSSC Wllt!?r riOhlS
<br />PUlchased vy Thornton wert! u~ed to Irrigato illlillla, suO'" heelS, corn, dry
<br />beans, Spring grains, vegclilhles and paSlu,e. Irligation melhods wCle
<br />"SUrface irdgntio/l (wilh and Wilhoul tailwater rCllse] and sprinklel.
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<br />G~~LDpmQ~'(;!l_QlJt--ni!!Y~is. Thorntan's engineelillg consultants
<br />madl! Ihe assllmlllion lhal all Thornton larms were w.,lel shorl. li.r.. the
<br />i~R Iltlhe Inun always e_ceedell the available Wilier supply': Ihus, il was
<br />not necessaly to. consider all water supplies avairable 10. Ihc Illfms, bUl onry
<br />'l~'consider lhal POrtion anribulablo to the WSSC wmer dghlS. Thornton
<br />analY2cd tho histolic use utili/lng SCS OC ImOdificd Blaney Criddla melhod,
<br />(USOA.SCS, 1967,) to calculale monlhty Iwn and II Lotus 1-2.J wOrkshOOI
<br />10' colr:uloto hIstoric Consumptive use Ilnd rotuln Ilow~ Contlarlly.
<br />NC&www observed IIlal the lalms's available waler supply included
<br />\VSSC surlace Wllter rigllts purchasllll hy Th/'JIlllo.... irrigatIon wt!lIs. and
<br />rrt'terCepted runoff 'rom Surrounding larms, Thorelorc, NC&WWW's
<br />b-nalysis Included all SOlllees 01 watf'r 10 I)ilch Individual faull And appor.
<br />;Jonlld the consumnlive use, and leluln lIows based on Ihe rc/<1livo
<br />distribution ollbe sunpHes. NC&WWW utili2ec/.l daily soil moisture budget
<br />!Q estimate moothly IWR and dl!signed a Computer mOdel 01 the irrigDled
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<br />IlllflHluClloH
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<br />t':,i:;
<br />In t9fHi. the City or Tl1orntoo pwchas,~cJ ovcr 21.'OO~ acres on..
<br />'arms In Northern Colo'ado. Tlle 1hornlon lalms hlsIOrlCany,~r{i'~~
<br />Cc
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<br />, . E. PEW W Wheeler (Inti Associates,
<br />S"'1I0. nOlnccr. ", . .
<br />South "nca St.ewt, fflUIf!Wood, Colonldo BOll0.
<br />lSenior Watef Hr!sources Engmcer, r.E., Northern
<br />Conservancy Distrir.t. l.ovl)lillld, Cololildo 80539
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<br />Ill~r,
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