FLOOD04244

• County: Ouray
• Stream Name: Uncompahgre River
• Basin: Gunnison
• Title: Hydrology Addendum to FIS Ouray County Unincorporated Areas
• Date: 7/3/1985
• Prepared For: Ouray County
• Prepared By: Montgomery Watson
• Floodplain - Doc Type: Floodplain Report/Masterplan

.
.:
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
I.
.
.

Plots of the bypothetical routing operation of the reservoir for flood control, in the years' 1921
md 1984, are plotted on Plates 8-2 and 8-3. respectively. The 120-day volume for lOO-year
snoWtllelt flood is 264,000 ac-ft (326 !unJ), according to the unregulated freque1lCy curve an Plate
8-4.

:,i",',.:~'~'~!~lnl~i~[;i{~;'-:::::::,f;~';~1l!" .:. - 1~LE'~~,L.... . . ':1
":". ",'I,,,:,,:,:,:;,,,,:,: .,..,PROBABLE. MlAXIMlJM FLOODS,
:' :.<~::~:;.l!l\\:E:~;~;;::.~;~\t~~~ ;!;: ~._ . -I,: '~~':_~:!: :'1",;..,.. '':":':.. . .. ,'I?:I;I':~' .,-: - 'I

TYPE PEAK
cfs)
Spring Rain-on-Snow 43,200 152,500
2 Hours)
Local Thunderstorm 78,000 38.400
(6 Hours)
Fall General St= 51,000 64,300
(72 Hours

-'.1:. TABLE 8-2
FLOODS.ON THE UNCOMPAHGRE RIVER
AT caLONA. COLORADO
YEAR Unregulated Regulated
by Ridgway
(cis) (cfs)
1921 4,380 2,000
1984 3,360 2,000
1938 3.250 1.700
1983 3,200 1800
1975 3,050 1,600
1914 3,040 2,000

NoteS:
I. Annual maximum mean daily flow.
2. Regulated operation is based on theoretical
operation of Ridgway for flood control.
3. unregulated flows do !lOt include irrigation

8-2

.