FLOOD00209

• Designation Number: 543
• County: El Paso
• Community: Unincorporated El Paso County
• Title: Flood Insurance Study - Pitkin County, CO, and Incorporated Areas
• Date: 9/1/1988
• Designation Date: 3/1/2001
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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CWCB Hvdroloav Worksheet

Page 2

Title ot Study:
County:
Calculations By:

FIS - Pitkin County, Colorado and Incorporated Areas
Pitkin
J. Seamons Date: May 11, 2001

Documentation
This workbook estimates 1 OO-year discharges tor approximate tloodplains in Colorado using the tollowing
source:
Browning, T.W. 1999. Guidelines tor Determining 1 DO-year Flood Flows tor Approximate
Floodplains in Colorado, Version 4.0. Colorado Water Conservation Board. January.

River Basin
I COL-!: Colorado, Upper Colorado River Subregion
Status ot Regression Equations tor this sub-region:

B

Draft

Regression Equation Data
Q=aAb

Where:
Q = Discharge (cfs)
A = Drainage Area (square miles)
a = coefficient =
b = coefficient =

79.5
0.724

Limited by:
Minimum Drainage Area =
Maximum Drainage Area =

1 square miles
950 square miles

Discharge Calculations

Drainage Drainage 100-year
Area ID Drainage Area Description Area (mi") Discharge (cts)
Camp Foster Creek @ Thompson Creek ContI. 1.48 106
F ryingpan River @ F ryingpan Lakes Outlet 3.90 213
Fryingpan River @ Ruedi Reservoir Outlet 254.59 4,387
South Fork Fryingpan River @ Fryingpan River ContI. 17.97 644
North Fork Fryingpan River @ Fryingpan River Conti. 41.90 1,188
East Fork Homestake Creek @ Pitkin/Garfield County Line 6.04 292
Ivanhoe Creek @ Fryingpan River ContI. 12.16 485
Deeds Creek @ South Fork Road 5.73 281
Foster Gulch @ Deeds Creek ContI. 4.15 223

5111101
CWCB_Hydrology(2).x1s