FLOOD00591

• County: Weld
• Community: Greeley
• Stream Name: Cache La Poudre River
• Title: Floodplain and Floodway Analysis
• Date: 2/20/1994
• Prepared For: CWCB
• Prepared By: Brown & Caldwell
• Floodplain - Doc Type: Floodplain Report/Masterplan

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BmDG~CULVERTFORM

Analysis (Cont'dl

1.05
..Q..4
~

o.~
0, &:,

Loss Coefficients

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Entrance loss coefficient
Manning's "n" value assigned to the structure(s)
Friction loss coefficient througb structure(s)
Other loss coefficients (e.g., bend,
manhole, etc.)
Totallosa coefficient
Weir coefficient
Pier coefficient
Contraction loss coefficient
Expansion loss coefficient

0.03

1.5

o r
..0

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Sediment Transport Considerationa

1. A. Is there any indication from historical records that sediment transport (including scour
and deposition) can affect the lOO-year water-surface elevationa?
DYes 00 No

B. Based on the conditiona (such as geomorphology, vegetative cover and development of
the watersbed and stream bed, and bankconditiona), ia there a potential for debris and
sediment transport (including scour and deposition) to affect the 10o-year water-surface
elevations and/or conveyance capacity through the bridge/culvert?
DYes IlO No

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2. If the answer to either lA or IB is yes:
A. What is the estimated sediment (bed material) load?

cfs (attach gradation curve)

Ezplain method used to estimate the sediment transport and the depth of scour and/or
deposition

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B. Will sediment accumulate anywhere through the bridge/culvert?
DYes IXI No

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If yes, explain what is the impact on the conveyance capacity through the
bridge/culvert?

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October 1992 Page 5 of 6

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APPUCATlClHlCERTlnCATlON FORMS roa COtmmOH.U li.TTE.R OF MAPIl&VISIOH. LE'n'D OF' WAPUVJSlOtI AHDPHYSlCALMAP REVISION