FLOOD03525

• County: Statewide
• Community: na
• Basin: Statewide
• Title: Procedures for Compliance with Floodway Regulations
• Date: 5/1/1990
• Prepared For: State of Pennsylvania
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Educational/Technical/Reference Information

TABLE OF CONTENTS

1. INTRODUCTION....................................

1 - 1 . Purpose .........................................
1-2. Report Organization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. THE NATIONAL FLOOD INSURANCE PROGRAM..........

2-1. Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ,
2-2. General Development Procedures ....................,
2-3. Flood Hazard Analysis of NFIP Areas. . . . . . . . . . . . . . . . . . ,

3. PRELIMINARY EVALUATION OF PROPOSED DEVELOPMENT,

3-1. General ........................................,
3-2. Locating Floodplain Development . . . . . . . . . . . . . . . . . . . . ,

4. FlOODWAY DEVELOPMENT IMPACTS...................

4- 1 . Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ,
4-2. Development Complies with Floodplain Regulations. . . . . . ,
4-3. Development Results in Profile Rise Within Surcharge limits,
4-4. Development Results in Profile Rise Above Surcharge limits

5. EXAMPLES OF flOODPLAIN DEVELOPMENT. . . . . . . . . . . . . '

5- 1 . Overview ......................................
5-2. Downstream Side of Existing Structure. . . . . . . . . . . . . . . . .
5-3. Relocation of Channel Alignment. . . . . . . . . . . . . . . . . . . . .
5-4. Equal Conveyance Replacement .....................
5-5. Development Elevated On Piers or Columns. . . . . . . . . . . . .
5-6. Fi II or Barrier Obstruction ..........................
5-7. Highway Stream Crossing ..........................

6. FLOODWAY IMPACT ANALySiS.......................

6-1. General ........................................

6-2. Data Required ...................................
6-3. Analysis Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .