FLOOD06380

• County: Statewide
• Community: Adams/Arapahoe/Denver/Broomfield/Douglas/Jeffco
• Basin: Statewide
• Title: Urban Storm Drainage, Criteria Manual Volume 2
• Date: 6/1/2001
• Prepared By: Wright Water Engineers, Inc.
• Floodplain - Doc Type: Educational/Technical/Reference Information

TABLE OF CONTENTS

DRAINAGE CRITERIA MANUAL (V. 2)

8.0

REFERENCES. ..................... .... ..... ....................... ...,........................... ............................. ...... S0-40

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Flood Proofing

1.0 FLOOD PROOFING ................................................................................................................... FP-1
1.1 Definition of Flood Proofing ...........................................................................................FP-1
1.2 Overview of Flood-Proofing Methods ............................................................................FP-1
1.2.1 Classification of Flood Proofing ........................................................................FP-1
1.2.2 FEMA Recommended Methods .......................................................................FP-1
1.3 Approach of Manual Relative to Flood-Proofing Guidance ...........................................FP-2
1.4 Regulatory Considerations ............................................................................................ FP-2
1.5 Flood Proofing In the Context of Overail Floodplain Management ...............................FP-2

2.0 WHEN TO FLOOD PROOF........................................................................................................FP-4
2.1 How Flooding Can Damage Structures .........................................................................FP-4

2.1.1 DEPTH/ELEVATION OF FLOODING ........................................................................................FP-4
2.1.2 Flow Velocity........ ..... .................. ...... ..........,..........................,.......................... FP-6
2.1.3 Flood Frequency ..,.................................................,..........................................FP-7
2.1.4 Rate of Rise and Rate of Fail ...........................................................................FP-7

2.1.5 Duration ................................,...........................................................................FP-8
2.1.6 Debris Impact.... ........ .......................,................................................................ FP-8
2.2 When Flood Proofing is Not Appropriate .......................................................................FP-8
2.3 Typical Causes of Flooding Problems ...........................................................................FP-8
2.3.1 Inadequate Street Conveyance ........................................................................FP-8
2.3.2 Inadequate Storm Sewer Conveyance.............................................................FP-9
2.3.3 Inadequate Drainage Channel Conveyance ....................................................FP-9 .-
2.3.4 Sewage Backup............ ................... .................,................. ................. ............. FP-9 .

3.0 FLOOD PROOFING METHODS ..............................................................................................FP-10
3.1 Overview of Six Methods Identified by FEMA .......................................................,..,..FP-10
3.1.2 Wet Flood Proofing .......................................................,.................................FP-12
3.1.3 Dry Flood Proofing ..........................................................................................FP-13
3.1.4 Relocation................................. ....... ............................... ................... ............. FP-15
3.1.5 Levees and Fioodwails ...................................................................................FP-16
3.1.6 Demoiition....................................................................................................... FP-18
3.2 Engineering Aspects..................................... ....... ........................................................ FP-19
3.2.1 Analysis of Flood Hazards..............................................................................FP-19
3.2.2 Site Characteristics..... ........................ ................... ..................... ........ ............ FP-20
3.2.3 Building Characteristics ......... ....... ......................... ........................ ........... ...... FP-20
3.3 Selection of Flood-Proofing Techniques.................................................................,....FP-20
3.3.1 Regulatory Considerations................ .................. ..... ...................... ................ FP-20
3.3.2 Appearance........... .............. ,............................. ..... ........................................ FP-21
3.3.3 Accessibility............................... ,......... ........... ..... ....................... .................... FP-21
3.3.4 Human Intervention Required.......... .............................. ................................. FP-21
3.3.5 Benefit/Cost Analysis....."......."....... .......... ..................... ......... ....................... FP-21
3.3.6 Other.................... .................. ..................................... ..................,...... ,..,..,.... FP-21

4.0 PROVIDING ASSISTANCE TO PROPERTY OWNERS ....,............................................,.......FP-22
4.1 Decision Making Process for Property Owners ...........................................................FP-22

4.1.1 DETERMINE FLOOD HAZARDS .............................................................................................FP-22
4.1.2 Inspect Structure............ ........................................ ......................................... FP-22
4.1.3 Contact Local Officials .................................................. .................................. FP-23
4.1.4 Consult With Professionals....................... ......................................................FP-23

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TOC-vi
Urban Drainage and Flood Control District

6/2001