WSP05269

• File Number: 8142.400
• Description: Trinidad Project - Reports
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 4/1/1964
• Author: US BOR
• Title: US Bureau of Reclamation - Trinidad Irrigation and Flood Control Project - Preliminary Report - Volume I
• Water Supply Pro - Doc Type: Report/Study

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.

,fSopris to
Trinidad

Data on floods and flood control afforded follow:

Purgatoire River - Estimated Peak Discharge
(second-feet)

. FloOd. : Infiow : Outflow
Frequency:. At to from
Years : Trinidad:Reservoir:Reservoir:

1,000
500
250
100
50
25
10
1

111,000:
95,000:
78,000:
58,000:
46,000:
36,000:
25,000:
6,000:

:

111,000
95,000
78,000
58,000:
46,000
36,000
25,000
6,000

28,300
27,200 :'
25,500
24,000
22,000
17,000
5,000
500

27,000
23,000
20,000
15,000
13,000
9,500
7,5UO
2,,;00

* Peaks of floods originating below the reservoir

The design flood at the reservoir is estimated to have a peak

discharge of 155,0,10 second.-fest, which is regulated to an outflo\v

of about 38,000 second-feet. This is the maximum flood that may

eVer bo expected.

For the river reach between tho dam site and Trinidad, flood

flows originating here with their short time of concentration, will

be well out of the way before regulated flows from the reservoir

reach the city limits, making unnecessary any great expenditure of

funds for challUel improvements through the city of Trinidad.

Studies indicate the present capacity at 25,000 second-feet; how-

ever, the flood of 1925 with its peak discharge 01'30,000 second-

feet caused very little overflow. The 1904 flood with a peak flow

of 50,000 second-feet put the river out of its banks through and

above Trinidad. For a similar flood the reservoir outflow Vlould be

24,000 second-feet.

F