234. Supplemental water supply along Purgatoire River

(1)

U.S. DEPARTMENT Of ACIRICUL.TURE a PUBLIC ROADS

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(9)

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... U PL7

by

R. L. Parsh.-11; .~en ior Iri 1.1 a tion 1•ngin ~, .r,

U. S. Departmt:.nt of A r.icu 1 ure,

Bu e .1_.1

or:

l.g1·1 c 11 "'ura n · i ncering,

Colo:. f1c1o Agricultural xperjment ~"">tat ion, ?art ~ollins, Colorado,

Ja~1uary, 193o.

The utilization o · the ¥ater supply for irri~ation in

the upper reaches

or

th\J Purgatoire ... i ver is of grec(L. imp

ort-ance at this tie; in fact thi& matter of ~ter ~pply is a problem of lon stan 1ng and of serious conoer to tle

fc;.rmer. Rece· t drought ye rs b .. ··ve de apparen the real

need of some means, if poss"ble, wherety tle for

irrigation mar be imr.n:oved or a~s ·red by tfmpor-rily checking

or storin the run-off from su er freshets which are more

or less common in t. j s vj c:ini ty. ~~l..e dra.:...:. .. ge area of the

Purgatoj_re ivt:-:n .. above Trinidad, v.llich constttutqs so~e 700 SllUUte miles i : sub ,ject to f ~e. _uen cJ ouc1bur s . · during the

sunmter .~onths , and bec~uoe 01 the stee·pl.y sloi in.o country in

tbiF urea, t1e run-off is rap d rnd res1lt~ iD floods Of

destructi\re prODOrt1ons. I·r. lS b~]ieve(i th t O~.t.e of t.1e

chief reasons f•or tho ra )iO accum :' atior.L of f'1 oocl 1_1')~ Prs,

espeoi, lly in the mountain and foo hill ar.as, is b6cruse

of the PP ·otected so~ 1 s~1rface. A conB1 Er""'f.lbJ e portion of the timber ir this area has been removed, nd ·this,

together with ~he effect of extensive gr. ~ing, is, 10 do bt, 1· .rgel' res not si ble for tl1e rapid run-off o-r th, st()rm v,ater

(11)

-2

-from this drainage basin.

Entering the xna:tn ri vor · (}ha.n.r1e~~ at f'reque. t intervt1ls,

upatrea~ from Trinid(d, are r d~ chanPeJ Jribttarie~, 1hlch

are f lmost universally of ate0p gr ·do probabl' grea ~er ·than the main river channel which is e....,ti!.iluted to be 50 feet per :mile. The oons·tr 1ction of dams at, o,.. near, the nouths of

these tri bu ,:aries as a me(j ns of' eonst:~rvi:n.g or regula~ ing the flood rlows have 'been. consioe~ ea;. Prclimil1.ur·y su:rvE.y·s have

b.~cn r:1.ade oP several

or

thesE. possil~lo :;;:eserv·oir si ;; ,::; , and

it is fou.r.d tha+: the cr ... paci Lies renge om 5000 to 12,000

acre-feet, and ·the. estimf1t01 COS ti ~"10uld n~r: bet fl0:(}U :JQ

and ~7;100 per f.lCra-foo't of storage. T1_he _{steep slopos of} _·he

ohannsls an~ the 0orres~ondin· high velocit13s of ~ha flood

:f'low are conduc~tve of' large q.1antitles

o.:

debris being

carried into these busJ.ns, and in a11 probabilitv the useful

life o: such storage re~ervoirs woula be rather short. The

Cucharas .~..f~ser·voir on t ,1.€., strear ... of tl"!is sr .,,1e n:1111.G, a

tr i bu·tary to th& Huerfano .H 1. var tu d 1oce. .e ~ i H .... rJ'>a-"10

County, ~n~ bU"lt i~ 1906. OriGinally, thia res-rtoir

had a capacity of about 77,000 ac1e~feet at a ga~o of 125

:f'ee·t. 1 t i 8 now ent ima ted thAt tho ·not Lu.u1 or iO'"'J:Jer GO teet

silt dc_;o~}it. This :1.s u channel reservoir.

For the sr:Jvel-.,&.1 poss~~ble resei·voir sites c: bove T ... ~inidad

on the r-·urgatoire , 1 _i_vcr_, _it_appe·-1rs _:.J..:.o _the _Lone; ,,anon site

ha:.:: the noss:i.'btli·ty of bei.ng f'illcj b,,r f'lood water from the

main river c:!1.::..nn .1 through an :inlet canal of oome · .ro or

(12)

f

\

_This _off-che.nnel_{r~s ·~rvoir}_{would possess} _{an ad van}_,.age _Ln _t:hnt

tho t'ecover of' f•lood flow ,;ou.ld be mor~e oert& iii 1)eca:use Jf the two s·Y1rces o s~lpp]

7.,

namely,. Lonr:: Canc.n and the river

covering this res ,rvoir Eite, mnd :3h.o-.:rs thH UodeJ Irrige.t·ion

District as c1atr. ant. ~3houJ.d t;his l.on.c; Canon Recervoir

hether

or

not any com~on benefit woul~ accrue ~o the water users in this valley~ ~1

his resex·Yoir sitE~ is locatec1 about

Tht~ Wet Canon Reservoir si·,& 1~ located on :1 rJicJ.c

It i~'\) said that

:.tt

1s :poa.eihle here to dJvort V·ater f "om the

-mttin r:tver channel through ai1 :.nlct eana1 into "this basin,

bt..~.t t~cause of t1v~ much hieher altitude the i'lood tlo ~ in

to hf.l !G H CU •• ao l t -;(' <I Of 8. OOU t

of the lir'li·ted oa-paci t./ 1.t W01l..i.d. mOfJt likely :r·esult in a

conipnr(: t~i vely hi .. )1 cost wbAn b H?e · on the unit of ao:rc-feet

of st;orage. The severr:~.l sid.e ch-nnel reserv i.r si tes above Trinj_dad are of ~'"elati vely small ca ~:.oi ty, and ·\·ouJ.d very

(13)

-4-likely be 1'¥eadily tilled With a deposi., )f se.n :1 and s 1 t .

In the considcrat1o.' of fillY or hll o:r these poss_:ble

reservo tr si tch on tho maJ n ::-i y(~:t· ohr~r l i e 11r t1'1butariea •

a num1H~r of' im 01"'tan~ pht£H~EH3 of the' problem, as a wl1o1e,.

wouJ.d. have -l o be thorou hly in--: :;S.t.·igE ted. In thio oo :nr~ ct1on,

i~he rnatter o. 3I'ior rie~ ts of appropriation on t~11s :·tver,

Purgatoi-r-e River :i.s ona of tho pr).neipal ·tr:l'butaries, is

Because of tho limiGations of priority ri~h~e to direct nd

stor ·,ge flocrs frorn ··:1e P'1_{TE:£:t··)i.i.'"'C} f:i Ye:r , and also t 11e d ireot

comb:ln~i.t;ion, Lnke an uneerte.inty a.:; .~~~ ~hetiho:r Ql' not , should

one or r.1ore o· ':1:t.HJO reservoirs--- be ooustructe.1, there ould

be:1 por.nitto.1 perrn.t;).nent o:c teu:porar~ storag-::' o:t" V'ater not

claimed by jUS v . ~pproprit::l. t'.)l~S OU O:i.'1J?. OJ" -'Gh •. .> Other' Of these

Canal, near .L€Uut..r, · s .. ~11 as iu- 8_ s ·ate , H.'t 1. Br~rt:· men .. t.:.:>

\Yi.trl the state• of .~unsas ,p.rosent concitions B.n··· limitations

which, frorr an irrigation s·r-'1ndpoint) VtouJ. .. dictate very

largely as to the possibility of ~torin{ w~ter on Lh~

Purgc1toirc : i·ve:r U! der no:rr;y.aJ. or o.vcr e conattio.1s. There

may be tilrtGS a~ exte.n1ied :i.ntervals w, .n excess ·vat:;:r would

be available :Co.. stor ge ~ iJ.'hE: f'J.£:.sb-fJ ood :t'Jow OT fr ... shet •

because of the c:rest or :p-sak anount in""· to ma:ry t~1o ·.sands of

(14)

R1 ver, i.r the vicint ty o:r 'l't·in idnd, is SE; id to be about 25; 000

exceed 5000 fl_cre-f .et; v...-ry 1i.~ ly ,9, consid ,rab1y 1 ss amount.

The general probleu of floods i· the Purgatoire River,

especially those (· .. o~'Il.L.1t; from th~..~~ ,_rpp :r coun ~rJ ubov~;

~rrinid d., i.ncludes thg el :ment o ~ floo- protection

ro

r the

city as we,l cs for irrigntion works alons thia str0~m.

as storage basins for irrig~titn ar~ flood protection, it

would be reasonc~ble to t~st;ume tht. t 11igber unit cof;ts 1)er

main points of the preble n; narnel~ , stOi."'r.ge fo:c irrigation and ·protectior .. o.cai'l~t floo!"~>, are, in a .measur:J, incompatible.

The ultimate }n·otectjcn rd&l1t be said to be for the reservoir empty • wh1 0h 1::ould 1 e con ~...rary to thG r esd.a of t.~.1e farmer; and, eonver'~ely, t.ith the roservo.iT: f•.4ll to supply jrrign.tion

along the ct~e~~, sover&l i1~oundir3 rs~ervoirs waul~ be

necesear~ anc1 u.esif.·ned &o as ~JO ·t.empor ril.l reatric t and

regul.;-tte the f'low and drain off th#~ accumultd:ion o:l water

within a 1"":e:; 11ours. _Duoh

e.

_floc><.l p::otection project VioulC.

not be of gre"tt benefit to t1e far.~.ers as supplemental

(15)

I

\

-6

-One of the urge~L need~ , froill he stanr point of irri&ation ,

in that l.ocali ty aC. j&ce:nt to mrinid~~d, be the

l ast ditct divPrsion in he T~in1Jad area. .ecaune o ~ the

q1antittes o 100 seccnt1-fcc'; or more t---, SU1Jply tho neods

of a re1ati-ve.ly small f1ov; ~:.~.:~ th~. hendgates o.r two smn 11

di cch .. s &erving tl1is fH!tall ~~rrirt .. ted d:i.st·r2.ct. ~-his pr"' o:tice

quanttty a·, to sHrve a ~odor-e.te denan .. : very gre~.1t1y· concerns

t he usej,: alor ~ ·-he u.ppcr ·urgatoire .~. -:v er.

Provi~ing 1 atora~e =escrvoir to consorv~ flood 1low

r ights.

b.:7 , r c 8ta ,;;:; ~ng:Lncer etnd

ani. vuri.ouQ oth0r possj.bl . reser--·.roi:r s itcc on \.ho Purgatoire

(16)

together wit · ftn!:ncia1 consid.e:re.1~ior~s hr ve in the pn st;

r1a.rrow gorge eli' nJ1 · (~ t vt. rtica1 soJ i ·~ rcH~k i,<Jf.tlls., A.t this

moderate cost. Surve~o cf this ~ite show ttat for a depth

satisfy lor:s .. ) requi.r · m·~rts {-UVJ bG v.·.i:thin economic llmi ts in

Ri.vor valley 1l7ill r;;sul t .

along thi~ riv1~ 8n1 on side o1annel tributaries~ Pa~~ioularl~

railroads or e~pen1ive lands to he consider d i~ t~e ~ost

tor i.rrtg'·tt:ton on th::f !'i rer o:r tributaJ:i e'-" would, ~~1most 'tlli thout

(17)

The Ca loa RosE.:rvoj r on the ArJ~ansas River, h.i c J at

t it' time · s elna c nsidere a~ t'=~ .mea f O' equaliz ·n tne

the fJood P·.trc~ to i ,...e i ve,..,

~lc:;o l t;ercept

a

t "'n.c 1 1\.e t orage reserroir an th~ t k H:tvo.~ i 1 in no ·.I he a benefjt

to t. o

fee rt dr o~e ·b . r vFi h ..., ecline in

ustri A0 res-pons

-i t)le for t· e c i .r· a ho~ T..,. . rd.Bl

of · ··. s sen , i o 1 of t ~ f? s .l. · te • Tl~G fO -IE'€! .. to

"; s c s i! ~

nr

.ocalj1ies

(18)

tfEMOHA2.iDlll1 OONC ·!fiN I.. ~G -~..·H~~ NBEDS Olil l~ ~ .. :t PPl,:I tf .t:PI.Y FOR IH"'1IGArriON Al ... ON\,, -nnE PIJ.Rf'(AT("!BE JiiV

Ir rrr:.J VI~; II IT" ow TP. 11 . D.lill, CO.!,OR .. 0.

by

B. L. Parshall, ~on :lor Ir igfltion En:'~'lne~r,

u

.

s

,

0epartrnent of

A;r:culture

t

Burenu

or

\gricultura. l!ll .. ;~in:-:.ering.

Colorado Agricultural '"·x.r:.lr.~·ment ::>tt~.tit):rl,

~ort Collins, C lorado,

Jan.ue.ry 1 1935.

The 1t iiizt. ion o

:r

the we tcr suppl.l or j.r:r !~1e t ion. i.n

the} upr er reach J~l l,jf tht:... Pttrgato i.ro.

ni

VE.:r is vi"' grea:t~ iml)Ort

S.ll~e at l:ls +ime,. in fact this at vOI' nf 'tetel SUpply iS 9.

pro

o.~:

long

otan~i ancl of se ..~.ous t::oncern to t 1

or a < r _ng the r1.r .. -off f~om stJ e

Ci less conmon in '!I is ·vicini t~r. The ~.l·t:.in:. r_:e aran of ·he

g ~ ount r ./ in

tl~ot onE: o p the

'He ters •

especially in thE;: mout .. "a in t1nd oo "hlll €iJ"t..as, is bee€ use

or

t e timber in. this area

has

beet l~emo,~ed, and ttis,

(19)

frorn this dr&.innge basin.

Entering the tru1Lu i ver cha:t !H~J. at t")req.ut-::n+J interv!~la,

ur.;

tre n fro ... Trin1dra are s··d~;; ch :rnel t1 i ,ut ric 1 hich

TfJ ~lltno.·t Uili Tersally Of StEH3p r&.d prob 0 gref;;. ver th>::.n

the tntJ.in r:t ver channel. wh.i oh :te t f1tim.ated to 1le 50 :fee·t por

mile 1

11

_.f3 constructlon of dams lt' c~· ncar. she mout

s

of

t ese tr"but r1 s as a ne ns o cons:rvin~ r re~1lat ng the

fJ ()Od tlo·ws h!nre l:;eon cons:i.dare1 . l'raliminar:; sur\:re·ys ha·ve

'been madt.

or

aeverl:ll

or

·hes<:, ·po~s ·tle reser\r;i:r s1 tc .. ::; and

i t is :rou:nd that ·t;he capacit.-ie~) r .nge frorn 5000 to 12,000

acro-f~~rt, and i·he c~stimated. cost ·~ould. -ary ~etween ·~50 and 100 ner acre-·roo; of stor~ vo .·" mhe st p clo,(,~es

or

~he ohn .. nels as1r the correspond .t.Ii ·· hi'·h veloo:l ti..e":" of tht·~ flood

tloll are conduci.Vf~ of J.a rge quant ·ties

o·r

debris boir·e

carrj~ed into these bo.sins, and i 11 proba iilit:Y the us~.t'ul

lifo o.~. nuch storage rcsE ... rvoi.rs would be rat e·r nhorJ • , he

Cu. charas ;t(::!SHrvol.r on the

atremn

of t.h 1.s sa . .~.o tu:u'le,. ~: tri buto.ry to the 1Iuerfano Hi ver a ' loca tee, · n H hf:rfa.no

County, wo.s buil · in 1906 ~ Origin lly, this. eservoi:r

had a oe.pacity of about 77.000 ac1e-f·~Htt a.t ~ g Sf=' of' 125

f{:~Gt. It is now eotimnt .. d that the • ottom or J 'Y"'Or 60 feet

o:f the dept.n is taken up b"7 a "PO anent f'illi 'g of _t? nd _t'tnd

silt deposit. lrhis is chanrH3. re ervoir.

For the several possible res.

r

voir

si teo above rrinid~

a.

on the Purgatoire iiver, it !'1p't eurs tho~ the l.ong Canon site

had the ponsibility

or

being filled bj flood i ter from tbe

m.t!in tive· c'~anne through an inlet canal o oomP tvro or

(20)

\

-3

-This off-channel reservoir would possess an advantage in that

the recovery of flood flow ~ould be nore certain because of

the two sources of sup)ly, namely, Long Canon and the river

itself . At the present time there is a filing on record

covering this r~servoir site, and shous the Model Irrigation

District as claimant. Should this Long Canon Reservoir

project be developed t;here "!!vould likely be a question as to

wheth~n· ol~ not any cou1tnon benefit would accrue to the water

users ix this valley. This reservoir ~te is located about

f ive miles u~strean from Trinidad.

The Wet Canon ResGrvoir site -is located on a side

channel tributary some 18 to 20 mil(-:lS upstrear"' from t~1e city.

It is said ·that it is possible hE~re to divert ·li;;-ater fro,!. the main river c~annel through

an

inlet canal into this basin,

but because of the much hieher al t i t~J_de the flood J'lov in

the river at t:v=~ point of di-version iJ/Oulo not 1Je Bxpected to

pJ:ovide a very material a.Jnount of water. r~flhere is evidence

of more or less flood flow in all side chai~el tributari~s.

The reservoir s:i te at Primero is loco. ted on tte main

I'i ver che"nnEL., and is estiTtlated t~o have a capaCity Of abOt1t

12,000 acre~feet. The track of the Colorado-Wyo~ing

Railroad Company traverses the site. The requirements of

safety would require n substantial dam, probably a concrete

structure 100 feet high, having a large spi.ll1J.'ay. Because

of the limited capacity it woulr most likely result in a

comparatively high cost when based on the unit of acre-feet

of storage. The several side channel reservoir &tes above

(21)

-4-l:lkely 1le read1l~ filled Wj.tb a depoei t or .sanJ. t.,rd sl.1; .•

In the cons1deration

ot

eny o~ all of these pc~si~le

rr:tH;,t•vo 11: s1 tcs on tho main ri vc:r chHnlJ.t~l or +:ri hutar-:i e~.~,

t! number cr1"' 1mpo;ctant phaaoa of ·thfl problt:J:ro.i ns a 'ttbole,

would he. ve ttl be tnol .. OUghly i11ves$;ifSa terl. In. this ro n k.. c t io11,

the mat \;er of 1-,rj_or right.r' of appro:p int1.on on 11e xi -v-er,

as ~~~ell as those on the A..rkansas River, of whioh tJ:·e

l>urga:toire RiVt3r 1a one of 1 .. ht:~ p;;tncipcll tributarie~~ t in

Ii"!.oat im_1)ort·nlt ~u1d t1'ttS1i be ziven cc";.reful consideration.

Because or the 11"·-rd i"ationn of priority righ~s to direct; and.

storage f. lows from th0 Pttrga.toir ~ Hi ver, and also t 11r: "1

ireot

and s torHge r 1 o;1Tts eff~oti vo on the 1 r :c. .. nsns 'P.:" .. ver, t a.~:en in

COrlbj_n~;.tion, w.nke e . .n. uncertainty a.s to ~hr~the:r or not, should

one or more of these reaervoirt:3 be constructed, there would

b~ pi-u""lrli1

; ted pe:rrrJ.!rnant C'T"' tem.pororJ a to· a.ge of v a ter no~ claimod by ,just app:rupr:tnto:rs on one or thi·~ other of ·t 1ese

t\lo r1v.ora. Certt~il1 pri()r rights ·to ¥JGter :ror the .1'-mity

Ca:.."lal, noar l~&n!:tr, as ;ell as i.ntersta"te ".&ter ag:reemtln1:;z

with t~1u atnts o1 .. Kanaa:J ,prenant aoLl il ·j.ions and li.mi ta:t;3.ons

wh:ioh, fronl an irri~.;at1on stH.ndp~)int,. wou:l ~:tctt~to 'tory

largel.r ~la to tlHJ possibility of 6 tor1

:ne

we. ter on the

Pur

,atolro

Biver under normal or

average

conditions

.

There

may be tir1es a~ extended 1.ntervals

w.,

en exce~:-ss wate:r woul(:

be available for :;!·to:taY"E":. lho flash-flood flotr or frE~shet,

br;lonus~~ of ·the Cl .. est o~ :peak omount int to many thousands of

SO(!Ond.-foc.t of 1-.low, 1;~ill

r.,sult

in a sur·err:lsinp· small eJ!lvunt

or

~,,e,ter· w··~en sn1oo·tt~od out on a.n nero-foot, basis.

(22)

·5·

River, i'Yl tht'3 vicinity of ~rr:tnidacl, is said to be about '25,000

t\eres t and ria.ht ~ully stort:H.~ wate1 d Lri t~T the sna~,-on mnjt n'-'t

exceed 5000 uere .... fe~~; ·v-ery likely B co:rlsid,n:&1)1~ l(u3r• a.mnunt.

'T'his accnm.ule~;ion uoul,, when {.iistributed a,;;t; "talter -. f t~o 'ITnOn

interest, be of no gre&t Denef1~~

1

!'httJ gBneretl -problem

o:

.

lcod.8 i ... t.he T'J.rghtOile f.ivsr ,

esi ecially those cc:u..ing fror11 the up~er eourtry a'bove

Trinld.ad J incluaas the element of flood pro·toation :fh r tht~

o1 ty (~.s wel. as ·or ir.rigatlon 't~o:rks alo11.g · t~his strrat . .:rL,

lf tJ1esu r<~se:r.-voir Pl10j<:iots are to bG aonsi.dered join·tly, aa stor·agf:7~ basins 1e<r 1!.rleation a.nd f~J..ooa protect·on, i.t

r·ould lH:; renaon~:tl)l(3 to assume that higher u.n:t oosta per

aore-forn.. of storage woulci be jus _, if:i.t~d. Ho ~1eva~, these two

xraJ~n poi11.ts of the -problem; n.arnely, sto~f:tge fo1'4 irt·j gat ion

ond ·prot,e ;tjon e.gain:;t .flO()i!.s, u:r-0.., irl n mpa.sure, :tnr:.ompat1'b1e •

. The ulti'm.atc protection n1ight be said ~.,o be f"or t;he :-,e : .. :·rvoir

emp·l;y, Vi b 5 ch ":".Oltll bt~ contrf1ry to thr .. n~;od.s of the fa;rrilE~r;

and t converGc~ly., with the re"Jervo:tr full to 15tlpply irrtg{i ti<nl

needs; no protection wou11 be

a~1ilable t~on

for

storage as

a menns of r,educ ing the ha~~ards ot f] Ol>dt.;. 1 (j i:rs'l}l':''t; drtt ple . flc.H'h: protect ian. tc1 the county, e it:\ ... nne :i.rr:i_gu +:ion in ... crests

along 'the strea1 ... , seveJ.1'a1 impounding :r·oservc,)rs ··c·uJd be

necessary nnd designed so as ·to t;empo.rari ly restrict and

:regulc:tte tlH~ fl01'i and drain off" the accumulation of t~rater

with111 are~ hours. Buche flcod protection project would

not be of g ·eat benefit t;o ..,he f.s.rm; rs a.s .a supplemental

(23)

One of tha urg :tnt er.~d ~, from th.e stanc.point ot' lrri, · .tion ,

i l that locality SdJDCODt to lrinidadt Ep~ears to be the

uti liz ,,t1on ot\ the av~1ila .1E1 supp11~ :i ·hout being le,~< lly

smu1..t. 1 'riga ted c l st1· i e t sone

eo

rniles or

more

:rrorw.

the

qua rti t;l.~~s o. 100 sec~n J -ft}et or :more 'to supply tl o needs

a1 t.ches se:rv· n.:-1 this small i .. riga ted ~, ... strict. This )rcc ice io in ac ")Ord .1.ce ·i th th lo. 11 of npprop:ri.a c. on but wholly

P 'llo i~i:n~

a.

storag ~ :refW)ervoir to cotlo Jl'•ve flood i'l~. ,''

a't t1 e l"runr otl1 RosQ ·voir st te ~o tl d be of gr • ..t!t benet i 3 to

the Mam toth si i.te

nd r )O;:;sib10 eservoir sites on the l'urgato:tre

(24)

-7

-together itr incnc.al conside.tntions h ve jn the t)

made uno rtai ties a· to the u i ate ~3uco s o ob n

.. nte p. ; se. he ~ammoth dam : i t · i.: lo a ted at th npp ,r

ena o a rock canon wher~ the could be ace~ n a na ro gor_o of am s VArtic£1 soliJ rock ~a11~. A

vh:s

k1 o u u.s to h . chal· cter o .] @Undat on.

Bec~u n.ar , ne3.., of }H, canon at tnis point

·b st r- :\ .o 1

vcr

likely bo attained at a

modcr t cost. &..::ur e., ) of thi. i te ho. th t ox• epth

o 200 f ... t' o at r ·t t - dar.u., the r ~s ~rvoi~ ·o 1 ha.V\=J

!-\ c pac: y o 5 a o .t ?00

,

r·oo

a re-feet. .~ .. is c oi "'l wo d

be g n tl: i, oxc · s of h , aj lao"t , ·.a tor '1UpUlJ. •

If i , fo1 nc1 _pobs._b~ _thr _nh _urth_r _i _ves_._{1 "a}_'"j_{ons, 'o}

s ti~fy 1. 11 ~eq ir~nents and b ~it)1n lConomic

1:

its i1

of floo . ~e, at his :te, h onsjde ble

.:..' JL in tl · t r f1uppl·tr or · h Bive va)ley wil1 r sult.

T ... er ·, are er possi . e r:.'! ... er- oir sl .es do ·ns ~,..reP..m

elo . ,h ·.a ri vor n on sid or'ar nel tri .. ut artie, J.u .ly;

fo . h o ~:1 an Cnaqu~ ua i es; tl are lo ·a tod. n the ... ain chc nnel o . the ur a:to1~e ~i er; th r.

ar.

no hi hwa -s,

..t. ·' lr(., ds or pe ... .l'3i e la. ~ds t be wO 1 . d red .:.n C... ,

of oto · · ge and for l f ~e e si 1.1 s ::t con.r dbrable nount

o 1. lo~, ex ecja.J- r tl Chaqua ua s te, could b

in ;ere ~ An p o ject OJ. sto · n floo flow~·

or j.rr · -'&tion or the i or . 1 ta il!3,._ ou d, 1 ~O thout

ed ·onJ be 1gorou 1 p.otasted by th. wrter users o~ txe

(25)

rhe Cad:loa ResE.:rvoir on the .[-.~len l<)VS 3.iver, ~hich at

t}:fu t:i.Xile is bein r 00118 de~ed fie'! 'i moa:n.rJ Of eqU&lizin the

flood an.d norlfu~l flo ·f the.t r ve-, will lso int;erce:t;rt

a

the loo. t"'ater · rom tl e Plrga.toire ~-~Jvo:r, but snch"~toroagE;

reservoir on the Arkanr-as Ri vnr 'tJ"ill in no \1""ay h ~ e benefit

to the f l'Hl~rs 1n t 10 Trinidi:l.d ax ea..

las rni 1.s ':ount:r ha.vo been respons