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PREPRO2004

PREPRO2004. BY ASHISH AGRAWAL. PREPRO2004. OVERVIEW. Why we need this tool? Inputs, Outputs and How it works? Comparison to other tools Capabilities of tool Future work Acknowledgement.

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PREPRO2004

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  1. PREPRO2004 BY ASHISH AGRAWAL

  2. PREPRO2004 OVERVIEW • Why we need this tool? • Inputs, Outputs and How it works? • Comparison to other tools • Capabilities of tool • Future work • Acknowledgement

  3. HEC – HMS (Hydrologic Modeling System) : Simulates precipitation –runoff processes for dendritic watershed systems INPUT - TEXT FILES (BASIN, METEOROLOGICAL , CONTROL, etc.) OUTPUT – HYDROGRAPH (TABLES, GRAPHS) BASIN FILE : Physical data describing the watershed, e.g. subbasin, streams, longest flow path, slopes, etc. METEOROLOGICAL FILE : Precipitation and evapotranspiration data PREPRO2004 * WHY WE NEED IT?

  4. Extracting hydrologic information from digital spatial data - create formatted text files – Readable by HMS Automating saves Time and Money Useful for future predictions – Change in Landuse, Impervious cover percentage. PREPRO2004 WHY WE NEED IT? (Contd...)

  5. P R E P RO 2 0 0 4 HEC-HMS PREPRO2004 INPUT/OUTPUT DEM NHD STREAMS IDM (Interface Data Model) THRESHOLD FOR STREAM DEFINITION (In number of cells) Mask

  6. PREPRO2004 COMPARISION • PrePro (ArcView 3.x) • Written in Avenue ( Scripting Language) • Linear Procedure • HEC-GeoHMS ( ArcView 3.x) • Written in Avenue • Linear Procedure • PrePro2002 (ArcView 8.x) • Written in Visual Basic • Linear Procedure • PrePro2004 (ArcView 8.x) • Exploiting GeoDatabase concept • Improvements over PrePro2002

  7. PREPRO2004 PATH SETUP DEM

  8. PREPRO2004 DEM/Mask/BurnIn Projection: DEM should be projected Could change Z-unit

  9. PREPRO2004 DEM/Mask/BurnIn RawDEM Mask Streams for BurnIn

  10. PREPRO2004 FIL/FDIR/FACC BurnedDEM TargetDEM

  11. PREPRO2004 FDIR

  12. PREPRO2004 FACC Flow Accumulation Grid : Flow Accumulation Function counts the number of cells upstream of a particular cell

  13. PREPRO2004 STREAMS/OUTLET

  14. PREPRO2004 STREAMS/OUTLET Extracted Flow Accumulation Grid : (extflowacc) Flow Accumulation values which are greater than threshold Stream Link Grid : (strgrid) Streams are divided into links with unique identification number Outlet Grid : (out) Outlet points of the stream links, which is most downstream point of every link Vectorized : Out(grid) -------> outlet (shapefile) Strgrid (grid) ------> Reach (shapefile)

  15. PREPRO2004 outlet STREAMS/OUTLET

  16. PREPRO2004 New streams ADD STREAMS RAIN DROP TOOL : Helps in adding stream by creating graphics

  17. PREPRO2004 Inlet/Source Outlet Reservoir ADD Inlet/Outlet/Reservoirs • Break stream links • INLETS • Get rid of every- • thing upstream • RESERVOIRS • Pose restrictions • when merging

  18. PREPRO2004 Delineate Watershed

  19. PREPRO2004 HMSSubbasin HMSReach HMSJunction HMSSource HMSReservoir Junction Outlets HMS Elements

  20. PREPRO2004 Merging Subbasins

  21. PREPRO2004 91 92 91 Merging Subbasins

  22. PREPRO2004 SUBBASIN PARAMETERS Longest Flow Path Length Slope of LFP Full length 10 – 85 % length U/S Elevation D/S Elevation Centroid of Subbasins Elevation at Centroid Centroidal Flow Length REACH PARAMETERS Length of Reach Slope of Reach U/S Elevation D/S Elevation Calculate Parameters

  23. PREPRO2004 • Change Impervious Cover percentage • – Modify Curve Number • Edit Landuse • Edit Soiltype Curve Number Curve Number: SCS Curve Number method uses CN to determine amount of runoff for given amount of rainfall. How? Intersection of Landuse (Shapefile), Soiltype (Shapefile) and watershed (Shapefile) Lookup Table

  24. PREPRO2004 Tool/IDM

  25. PREPRO2004 IDM to HMS

  26. PREPRO2004 HMS Files Subbasin: R00 Canvas X: 614903.792 Canvas Y: 3364445.138 Label X: Label Y: Area: 0.05 DownStream: J0 End: Junction: J0 Canvas X: 615194 Canvas Y: 3364208 Label X: Label Y: DownStream: R460 End:

  27. PREPRO2004 HMS Basin Model GIS HEC-HMS

  28. PREPRO2004 Future Work Preliminary Milestones • Calculate some more parameters - required by HMS • Modify Curve Number – Antecedent Moisture Condition (AMC) • Create Meteorological files (in progress) Final Destination • Delineate Flood Plain Map

  29. PREPRO2004 Conclusion • Automating – Less Time & Money • Predicting future changes will be easy • IDM can maintain different scenarios for comparison • Better data, advance algorithms – may attain greater accuracy over traditional method

  30. PREPRO2004 Acknowledgment • Dr. Francisco Olivera • For his guidance and support • Janghwoan Choi • Used some modules from his code • Srikanth Koka • Used some of the snapshots from exercise • created by him • http://www.hec.usace.army.mil/software/hec-hms/ • hechms-hechms.html

  31. PREPRO2004 Questions ?

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