FLOOD00150

• Designation Number: 579
• County: Gunnison
• Community: Marble and Vicinity
• Stream Name: Crystal River
• Title: Floodplain Information Report - Crystal River Technical Appendix
• Date: 8/1/2004
• Prepared For: CWCB
• Prepared By: Icon Engineering, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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TECHNICAL MANUAL

FLOOD INFORMATION NEAR GAGED SITES ON THE SAME STREAM

Peak discharges at sites near gaging stations on the same stream can be
computed by the foJ lowing equation:

QT(U)= [:~r QT(G)

whe re

QT(U)= peak discharge at ungaged site for recurrence Interval T,

QT(G)= weighted average discharge at gaged site for recurrence interval T,

AU = drainage area at ungaged site,

AG = drainage area at gaged site, and

X = exponent for each flood region as follows:

F1 ood Reg i on

Plains
Mountains
Northern Plateau
Southern Plateau

Exponent, X
0.48
.79
.50
.71

The above procedure Is applicable for ungaged sites where the drainage area
ratio lies between 0.5 and 2.0.

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