FLOOD01621

• County: Statewide
• Community: State of Colorado
• Title: Flood Hazard Delineation on Alluvial Fans and Urban Floodplains
• Date: 1/1/2001
• Prepared For: State of Colorado
• Prepared By: J.S. O'Brien
• Floodplain - Doc Type: Educational/Technical/Reference Information

Figure 1.

Figure 2.

Figure 3.

LIST OF ]']:GURES

Paqe

Dynamic Viscosity of Mudflow Samples
versus Volumetric Concemtration . . .

7

Yield Stress of Mudflm.;r Samples
versus Volumetric Concemtration

7

Flow Hydraulics Compute,d by FEMA Single
Channel Method for Hikel Springs Wash

11

Figure 4. Flow Hydraulics Computed by FEMA Multi-Channel
Method for Hiko Springs Wash . . . . . . . 12
Figure 5. Channel Profile for FLCl-2D versus HEC-2
Analysis . . . . . . . . . . . . . 24
Figure 6. Flow Depth - FLO-2D versus HEC-2 Analysis for
a Discharge of 500 cfs . . . . . . . 25
Figure 7. Flow Velocity - FLO-2D versus HEC-2 Analysis
for a Discharge of 500 cfs . . . . . . 26
Figure 8. Flow Depth - FLO-2D versus HEC-'2 Analysis for
a Discharge of 5000 cfs . . . . . . . . 26
Figure 9. Flow Velocity - FLO-2D versus HEC-2 Analysis
for a Discharge of 5000 cfs . . . . . . . 27

Figure 10. HEC-2 and FLO-2D Model Predicted Floodplain
Boundaries for the Poudre River Near
Fort Collins, Colorado . . . . . .

Figure 11.

Figure 12.

28

1983 Mudflow Hydrograph For Rudd Creek,
Davis County, Utah, Developed by the
Army Corp of Engineers . . . . . . . .

29

Area of Inundation and FLO-2D Predicted
Maximum Flow Depths for the 1983 Rudd
Creek Mudflow, Utah . . . . . . . . .

30

Figure 13. Depth Contours Showing Progression of the
Rudd Creek Mudflow Across the Alluvial Fan

31

Figure 14. Hiko Springs Wash Topography and
Grid System Layout . . . . .

Figure 15.

34

Flow Depth Contours, Exploded View #1,
Hiko Springs Wash . . . . . . . . . . .

35

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