FLOOD00787

• County: Denver
• Community: All
• Stream Name: All
• Title: Floodplain Management Tools for Alluvial Fans
• Date: 11/1/1981
• Prepared For: State of Colorado
• Prepared By: FEMA
• Floodplain - Doc Type: Educational/Technical/Reference Information

PART II:

STUDY DOCUMENTATION

1. Data Collection and Field Surve}'s 1
1.1 Data Collection Procedures 1
1.2 Data Sources Contacted 2
1.3 Key Findings 5

2. Physical Model Design and Construction 11
2.1 Model ing Sequence and Model Type 11
2.2 Modeling Theory 12
2.3 Description of River Mechanics flume 19
2.4 Idel ized fan Model Des ign 23
2 . 5 Ide a 1 i zed fan Mod e 1 Con s t r u c t ion 24
2.6 Magnesia Springs fan Model Design 27
2.7 Magnesia Springs fan Model Construction 28
2.8 Local Model Designs 3l
2.9 Construction of Local Models 34

3. Ideal ized Fan Model Experiments 36
3.1 Purposes of the Experimentation 36
3.2 Experimental Procedures 36
3.3 Hydraulic Variables. Channel Geometry and 38
the Effect of Sediment Supply
3.4 Flow Pattern and Flooding Zones 64
3.5 Variation in Morphology and Hydraulics for 70
Multiple Events

4. Magnesia Springs Model Experiments 80
4.1 Objectives 80
4.2 Procedures and Conditions Studied 80
4.3 Reproduction of 1979 Event 82
4.4 Performance of Apex Debris IBasin 85
4.5 Performance of Levee/Channel System 87

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