Flood Damage Reduction Analysis - Behind the Scenes

Flood Damage Reduction Analysis:

Behind the Scenes

C. Brian Patnode, PEBrown and Caldwell

1SERUG Conference | April 2010

Swannanoa River Watershed– Western NC, Buncombe County– Town of Black Mountain, NC to City of Asheville, NC– 132 Sq. Mi.

Project Location

SERUG Conference | April 2010 2

Hurricanes Frances and Ivan– September 2004– Major flooding in Biltmore Village Flood Reduction Task Force– Flood Risk Management Project

Data collection & analysis – HEC-FDA

Project Overview


Hydrologic Engineering Center –Flood Damage Reduction Analysis (HEC-FDA)


HEC-FDA Development


Quantify Flood Damages– Flood Inundation

– Economic Impact

– Appraisals

Structure Inventory Database (SID)


ArcGIS Application– Building Identification

– Field Survey Data

– Stationing of SID

Building Identification

– FEMA Floodplain

– Impervious Polygons

– Aerial Photography

Application of ArcGIS


Field Survey Data

– Structure Data– First Floor Elevation (FFE)– Nonstructural Screening



Building Valuation

– Tax Parcels– Appraisals– Replacement Costs

Less Depreciation



SID Stationing

– Convert Polygons to Points



SID StationingLinear Referencing– Create Routes



SID StationingLinear Referencing– Locate Features Along Route



SID StationingGenerate Near Table– Assign to XS using Script



Assign Damage Reaches

– Group SID by Riverand Reach Area



Interface - Importing– Configure– HydEng– Economics

Data Output– Results

Damage ReachStorm EventCategory

HEC-FDA Model Inputs


Flood Damage Reduction Analysis– Source Data Intensive

– Added Value of GISStructure Inventory DatabaseRiver StationingEconomic Damage Reaches

– Visualize Results

Summary


Questions?


Project Team and Partners – Thank You!

Flood Damage Reduction Analysis - Behind the Scenes

Documents

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