FLOOD04722

• County: Las Animas
• Basin: Arkansas
• Title: Storm and Flood of July2-3, 1981 Frijole Creek Basin
• Date: 9/1/1982
• Prepared For: Colorado and Southern Railway
• Prepared By: Bishop Associates, Inc.
• Floodplain - Doc Type: Flood Documentation Report

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APPENDIX C

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Summary of
Big Thompson Flood
(from USGS Professional Paper 1115, 1979)

Precipitation amount, intensity, and duration

Glen Comfort - 6 inches between 8 - 9 p.m. (2 inches before 8 p.m.
2 inches after 9 p.m.).
Glen Haven - 7 inches between 8 - 11 p.m., 2 inches before 8 p.m.

Glen Comfort and Glen Haven were in the area which received the
heaviest precipitation.

Peak Discharges in Glen Comfort - Glen Haven Area

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Noels Draw at Glen Comfort
Drainage area - 3.37 sq. mi.
Peak discharge - 6910 cfs
Unit discharge - 2050 cfs/sq. mi.

Dark Gulch at Glen Comfort
Drainage area - 1.00 sq. mi.
Peak discharge - 7210 cfs
Unit discharge - 7210 cfs/sq. mi.

Rabbit Gulch near Drake
Drainage area - 3.41 sq. mi.
Peak discharge - 3540 cfs
Unit discharge - 1038 cfs/sq. mi.

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North Fork Big Thompson at Glen Haven
Drainage area - 7.18 sq. mi.
Peak discharge - 1300 cfs
Unit discharge - 181 cfs/sq. mi.

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West Creek near Glen Haven
Drainage area - 23.1 sq. mi.
Peak discharge - 2320 cfs
Unit discharge - 100 cfs/sq. mi.

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Miller Fork near Glen Haven
Drinage area - 13.0 sq. mi.
Peak discharge - 2060 cfs
Unit discharge - 158 cfs/sq. mi.

North Fork Big Thompson River at Drake
Drainage area - 85.1 sq. mi.
Peak discharge - 8710 cfs
Unit discharge - 102 cfs/sq. mi.

(All peak discharges were determined by slope-area measurements).

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