7296

• UCREFRP Catalog Number: 7296
• Author: Theurer, F. D., K. A. Voos and C. G. Prewitt
• Title: Application of IFG's Instream Water Temperature Model in the Upper Colorado River
• USFW Year: 1982
• USFW - Doc Type: International Symposium on Hydrometeorology
• Copyright Material: YES

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. ,...: SUITABLE COLORADO SQUAWFISH SPAWNING .:'
TEMPERATURES AND SUBSTRATE HABITAT

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UNSUITABLE
SPAWNING
SUBSTRATE

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120 680 640 600 560 520 480
DrST ANCE ABOVE CONFLUENCE GREEN & COLORADO RIVERS

440 400
(kilometers)

Fipre 2. l.oIlJiuadiDal Temperature Promes from the Yampa Synthetic Gqe to the Oura)' Stuc1)' Site for Noma1 July HydtometcorolopcaI
CcmditiOllS. The meaD July flow at the Yam". symbetic PF (103 ems) .s used as the lSSlUDed nsenoir Jelease ltischarJe.
Nonnal July dischups were used for the mIIIiIIiDI tn1lutuies below this PJe. Promes are shOWD for various release temperatureS
flD!liDJ fJom 4-1SoC. plus the cxistiIIgnormal water temperature of 19.400C. at the Yampa synthetic PIC-

below this confluence down to Split Mountain will have an
improwd suitable spawning temperature and substrate
habitat for existing conditions.
!he second example demonstrates downstream tempera-
ture changes at a specified study site due to alteration of
flows at a given upstream location. It is done for two water
temperature criteria at the upstream location with twO con-
stant sets of hydrometeorol~ conditions. The simu.
lated water temperatures at the site include the impactS of
all additional normal flows in the network. These tempera-
tures are ploned versus the discharge at the site (Fi!W'e 3).
A separate curve is shown ior both governing upstream -....a.
ter temperature.criteria and each set oihydrometeorological
conditions. They are caned temperature versus site dis-
charge curves.
10 this example. only the temperature versus site dis.
charge curves at the Slad; Ro;;ks study site - a suspected
squawfJSh and known chub spawning habitat (Miller, er al..

198:!) - are shown. Nonnal June and July hydrometeoro-
logical conditions 'A'eJ'e used. Cameo gage was the given up-
stream location for assuming various flows ranging from
zero discharge to an amount sufficient to produce 700 cms
at Black Rocks. Two water temperature criteria at Cameo
sage were selected. The first criterion varied the water tem.
perature at Cameo with the assumed discharge: i.e.. the as.
sumed discharge was used with the normal monthly meteo-
rology to calculate water temperatures at Cameo. The see
cond criterion assumed that the water temperature at Cameo
would always be equal to the current mean monthly water
temperature regardless of assumed flow at Cameo: i.e.. the
water temperature associated \\ith the current mean montrJy
flow at Cameo. The normal June and Julv diurnal fluctua.
tions are slightly more than ::!.OoC for borlt mean monthly
discharges at mack Rocks.
\ Any combination of reservoirs, a:versions. or augment:l.
\ tions above ~he Camet' gage. tha~ wouid resul: in eith~r

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