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Flood Econ

Flood Econ. Computer Program. By Roger G. Cronshey John E. Long. What is Flood Econ ?. Watershed scale economic flood damage evaluation model system. Addresses both agricultural and urban damages Replaces current NRCS URB1 and ECON 2 computer programs. Why Develop FloodEcon?.

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Flood Econ

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  1. Flood Econ Computer Program By Roger G. Cronshey John E. Long

  2. What is Flood Econ ? • Watershed scale economic flood damage evaluation model system. • Addresses both agricultural and urban damages • Replaces current NRCS URB1 and ECON 2 computer programs

  3. Why Develop FloodEcon? • Make compatible with update TR-20 which feeds peak flow and flow duration data to current ECON2 program • Shift from WSP2 to HEC-RAS to supply cross section information to ECON2 asWSP2 is no longer supported by NRCS • Expect renewed interest in flood economics with pending Dam rehabilitation legislation

  4. FloodEcon System Features • Multiple programs make up the system • Windows based Controller/Editor is part that user interacts • Replaces capabilities of URB1 and ECON2 • Core model written in ANSI standard language (Fortran90) for portability • Interface w/ HEC-RAS for cross section information to be added

  5. Crop Damage Data Building Damage Data • Data Displays and Plots TR-20 Input Data Old ECON2 Input Data ECON2 Input Converter Old ECON2 File Name TR-20 Model HEC-RASOutput File Name Old URB1 Input Data HEC-RAS Output URB 1 Input Converter Printed Page Error Debug Flood Econ Input File Name Flood Econ Model Flood Econ Input Data HEC-RAS Section Retriever Flood Econ SystemController / Editor LegendData Flow Program Flow Old URB1 File Name Flood Econ System Partial Outside Project Scope

  6. Controller/Editor Features • New User guidance (Help windows) • Input/Output in either English or metric units • Ten data entry windows - use only those needed for current job • No fixed order for data entry • Entry window and variable help displayed as needed

  7. Building Data • Damages at a point • Flood Damage data by stage for building, its contents, and associated business loss • Generic buildings can be reused as many times as needed • Each building in the watershed must be located in relation to stream and valley station • Can use published COE depth damage factors directly as input

  8. Building Flood Stage Terminology Cross Section A Stage 8 Cross Section B Interpolated flood elevation 6 First floor elevation 4 2 0 -2 -4 Elevation damage begins -6 -8 Elevation of zero damage Depth of water in building

  9. Cropland Damage • Damages over an area • Monthly crop damages may be due to depth of flooding and/or duration of flooding • Generic crops may be reused as often as needed in the watershed • Subdivide field to represent crop rotations • Each cropland field in the watershed must be located in relation to stream and valley station

  10. Cropland Duration Flooding HighestElevation Peak Dur 1 El Dur 2 El Dur 3 El Lowest Elevation Incremental Area 1 Incremental Area 2 Incremental Area 3 IncrementalArea 4 Incremental Area = cropland area * (Δ incremental Elevation) / (Hi El - Low El)

  11. Cross Section • Elevation and discharge data (generally from HEC-RAS) at selected locations along each stream in watershed • Section may represent a head loss through bridge or culvert by also specifying a downstream elevation for each flow • Used to translate peak flow and flow duration data from TR-20 into elevation • No stationing or elevation extrapolation

  12. Stream Valley Stationing 5+00 Store @ 4+50 4+00 Beans @ 3+58 Barn @ 2+25 3+00 2+00 House @ 1+50 1+00 Corn @ 1+67

  13. Damage Reach • Portion of a stream for which economic damages are to be accumulated • Reaches are identified by stream name and upstream valley station • Multiple reaches on a stream run consecutively • All buildings and cropland within the reach station range are part of the reach

  14. Damage Reaches Build X Xsect D Xsect A Xsect C Xsect B Crop 3 Crop 2 Build Y Crop 1 Reach 3 Reach 2 Reach 1 Crop 1 and Build X are invalid as extrapolation would be required

  15. Flow Frequency • Up to 10 frequencies (probabilities) per run • Peak flows at each cross section locations for all streams in watershed • Flow frequency data (up to 3 durations) if cross section is needed for cropland flow duration interpolation

  16. Monthly Flood Distribution • Distribution by month of year for potential for flooding • Used as weighting factors for cropland damages which are entered by month • Only needed if there are cropland damages in the watershed

  17. Verification • Provides intermediate output to debug (*.dbg) file • All output in model internal units (English) • Echo of input data (reflecting defaults), pre-processing functions (mostly ordering data by stream and station), processing functions (check calculations for individual buildings or croplands)

  18. Testers Role • Experience the softwareLearn to useIdentify and document problems encountered • Evaluate the systemTechnical adequacy and accuracyDocumentation (needed additions/modifications) • Thoughts of Technology TransferTraining materials and deliveryHow should provide??

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