WSP08733

• File Number: 8141
• Description: Fryingpan-Arkansas Project
• State: CO
• Basin: Arkansas
• Water Division: 5
• Date: 3/7/1960
• Author: Acting Sec of Interi
• Title: Letter from Acting Secretary of the Interior transmitting a Report and Findings on Ruedi Dam and Reservoir Colo Pursuant to the Federal Reclamation Laws
• Water Supply Pro - Doc Type: Report/Study

37?~S
34 ..

RUED! DAM AND RESERVOIR, COLO.

A 'sulllmary of the reservoir opemtion st,ndy' (Aug. ID2D-:,J uly 1048)
in terms of ave.rage annual quantItIes of water In acre-feet. follows.
for t.he H)-veal' period.
Although t.he u..yerage nnnunJ municipal and indllst!'ial wate,r ~'e-
lease frolll Ruedi Resen.oil' is 34,000 acre-feet, eXllmlllation of 1Il-
di,'idnal yenrs ClIIay through April) in the stutly discloses that in
1,"e,II'S of low strealll flows suc~h as 1031, 1934~ and 1940, the rcql1ll'ed
j'eleases ,\'Ould he 66,000, 70,000, and 6l,000 acre-feet, respectil'ely"
all tin sed upon 2014 requirements. Ruedi ReSel'Hlir, therefore! would
pro\'ide substnnt.in.l water supplies from storage in tllO~e years of low
stl'e:nll flows.
AveriLge annun.l releases to fl\"oid ~pills and additional winter water
rep~'esent lUldepC'lldal,le yields as they wolthl ]lot be ilyailaLle in
Cl'l t.Ical vea.I'S.
'Vit.h'l'espect to releases for avoidance of spills, it was assumed t.hat
by April 1 of eaeh :rear a forecast of inflow and required releases
wonld he made for the ensuing spring and summer mOllt.hs. In case
:w.y of t.he fnl'f'ca~ts indicated tJlat spIlls would occur' if onlr re.Icnses
for mandatory bypa.sse~ and Illnniciplll and industrial watei. reqllil'e-
me.nts were made, then addit.ional releases "\'Vould be mncle in such n.
manne-r as to make t.he totnl reseryoir outflow quite uniform and to
enhance the operation for flood oontrul. Such relea~('s to :lyoid spills
mig-ht enhance fish floR's alld be benencial to power genel'ation, if uny,
and possibly for downstreflTH irrigat.ion use.

Il"FLO\V
Undepletell flow at RuetiL_________________h______________________
Less rlelllptions:
BlI!":k-hanboe diversilJn!'L____________n_______________ 4.400
. Fryingpan-Arkallsas diversiolls_________________________ 57,900

At'€raOe
annlla'
acre-feet
171,500

62,300

f:~~ e ~~e~~~r;':\~ ~ ~(~ ~~~~~;-_-_ -_-_-_-_ -_ -_-_-_ -_-_-_-_-_ -_-_-_ -_-_-_ -_-___ -_-_-~-_-_-_-_ -_-_-_-_-_-_-_-_-_-_

100, 200
800

Net reser\'oir water supply _________h_______________________

108. 400,

OUTFLOW

Downstream rights and Frying-pan-Arkansas replacemenL___________
Fish flows:
Illeal ref\UirPDlPnL_________________n___n___________ 54.100
Le~s Rocky Fork inflows____________________n________ -8.100
Less creditable outflow fM downst.ream rights and re-
phlct:>lllenL_________ ________n_____________________ -17, r,on
Less natural streamflow shortages_______n____________ -5. :!OO
Nt-t fish relpases______ _______n_____________________________
AdditioIlal relea!ie!': for municipal nnd imlust.rial water__________n__
Rpleases to avoid :-iJlills__________________________________n________
Undel)endable win ter relenses____ _ _ _ ___ _________ _ _ ___ _ ___ ___

20.000

! 23, 300.
34.600
22.600
7,900

Total reser-roir outflow _____ _ ____________n________ _n_______
I Available for dowDstream munIcipal and IndustrIal use.
AJthoug-h the oJ'€ration stu.fly shows (,hat, there wou\cl be no releases
required for lllUTIlClpal and llldnst.ru_11 water durmg wmter mont.hs,
some releases would be made in these mOllth~ in some years in addit.ion
to the mnndatory releases explained previously. Studies show that
reservoir content could be drn'Cll down to 07,000 ficre-feet by :March Bl
ill any }'earnnd that a.ll numda.tory and municipnl and industrial water
release requirements could still be Inet during the ensuing year eve.n

108,400

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