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Application and Techniques for Delineating Approximate Floodplain  Sudhanshu Mishra, CFM Greenhorne & O’Mara, Inc.
Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Flood Risks ,[object Object],[object Object],[object Object],[object Object]
Floodplains ,[object Object],[object Object],[object Object]
Floodplains (Cont.) Source: SMC Floodplain Studies for Bull Creek, Tony Wolff
Why Study Floodplains ,[object Object],[object Object],[object Object],[object Object]
Flood Damage Source: Tool Hire
Study Type ,[object Object],[object Object],[object Object]
Flood Zones ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Flood Zones (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Approximate Floodplain Study Techniques ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Approximate Floodplain Study Techniques (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Hydrology ,[object Object],[object Object],[object Object],[object Object]
Hydraulics ,[object Object],[object Object],[object Object],[object Object]
Floodplain Mapping – GIS Based Techniques ,[object Object],[object Object],[object Object]
A Case Study on Ash Creek, Lackawanna County, PA
Procedures ,[object Object],[object Object],[object Object]
Hydrology ,[object Object],[object Object],[object Object],[object Object]
Hydrology (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Peak-flow regions in Pennsylvania ( USGS Water-Resources Investigations Report 00-4189 )
Hydrology (Cont.) Regression model used to compute the peak flood  discharge for region 1: Q = 10 A (DA) b  (1+0.1Sto) f Where, Q,  peak flow, in cubic feet per second; A  is the intercept; DA  is drainage area, in square miles; Sto  is percentage of storage, in percent; and b and f,  are basin characteristic coefficients of regression.
HEC-GeoRAS PreRAS Process Assign Stream name and Reach ID Assign Flowpath directions
Hydraulic ,[object Object],[object Object],[object Object],[object Object],[object Object],HEC-RAS Process
Hydraulic HEC-RAS Process (Cont.)
Hydraulic ,[object Object],[object Object],HEC-RAS Process (Cont.)
Floodplain Mapping ,[object Object],[object Object],PostRAS Process
Floodplain Mapping PostRAS Process (Cont.)
Floodplain Mapping Smoothing
Conclusions ,[object Object],[object Object],[object Object],[object Object]
Thank You! Questions? Sudhanshu Mishra, CFM [email_address] Visit G&O’s Booth #417

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Asfpm 2009 Presentation S Mishra Final

Notes de l'éditeur

  1. Floodplain delineation tool is an ESRI product. G&O’s Water & Environmental group was responsible for The Food and Drug Administration consolidation in White Oak, Maryland (pictured here). They were responsible for the environmental permitting for the project, including compliance with the National Environmental Policy Act.
  2. c, d, e basin characteristic for region 1 are none.