FLOOD10386 ‎(2)‎

• Designation Number: 576
• County: Gilpin
• Community: Black Hawk
• Stream Name: North Clear Creek, Gregory Gulch and Chase Gulch
• Title: Floodplain Information Report - Black Hawk
• Date: 7/1/2004
• Prepared For: Black Hawk and CWCB
• Prepared By: Love and Associates
• Floodplain - Doc Type: Floodplain Report/Masterplan

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4 TECHNICAL MANUAL
FLOOD NFORMATION NEAR GAGED SITES ON THE SAME STREAM
Peak discharges at sites near gaging stations on the same stream can be
computed by the following equation:
QT(U) = [:~] \T (G)
where
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:
Flood Region Exponent, X
Plains 0.48
Mountains .79 t('
Northern Plateau .50
Southern Plateau ,/ . 71
The above procedure is appl icable for ungaged sites where the drainage area
rat i 0 es between 0.5 and 2.0