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CRWR-PrePro: A System of GIS Tools for HEC-HMS Modeling Support

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CRWR-PrePro: A System of GIS Tools for HEC-HMS Modeling Support

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    1. CRWR-PrePro: A System of GIS Tools for HEC-HMS Modeling Support Francisco Paco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin

    2. The Team David Maidment, Ph.D. Seann Reed, Ph.D. Ximing Cai, Ph.D. Ferdinand Hellweger Aubrey Dugger Francisco Olivera, Ph.D.

    3. What is HEC-HMS? It is a new generation software for precipitation-runoff simulation that supersedes the HEC-1 Flood Hydrograph Package. (HEC-HMS Users Manual) It is a Windows version of HEC-1.

    4. HEC-HMS Input Components

    5. What is CRWR-PrePro?

    6. Overview Input Data for the HEC-HMS Basin Component Raster-Based Terrain Analysis Raster-Based Sub-Basin and Reach Network Delineation Vectorization of Sub-Basins and Reach Segments Computation of Hydrologic Parameters of Sub-Basins and Reaches Extraction of Hydrologic Sub-System Topologic Analysis Input Data for the HEC-HMS Precipitation Component User-Specified Gage Weighting GridParm

    7. Terrain Analysis

    8. Terrain Analysis

    9. Terrain Analysis DEM and digitized reach network

    10. Terrain Analysis Burned-in DEM Elevation is increased by a fixed value in all cells, except for those that coincide with the digitized reach network.

    11. Terrain Analysis Flow direction Water flows to one of the eight neighbor cells, according to the direction of the steepest descent.

    12. Terrain Analysis Flow accumulation Measure of the drainage area in units of grid cells.

    13. Sub-Basins and Reach Network Reach network. Grid cells draining more than a user-defined threshold value (blue streams), or located downstream of user-defined cells (red streams) are part of the reach network.

    14. Sub-Basins and Reach Network Reach segmentation. Reach segments (links) are the sections of a reach channel connecting two successive junctions, a junction and an outlet, or a headwater and a junction.

    15. Sub-Basins and Reach Network Watershed outlets. The most downstream cells of the reach segments (brown cells), and user-defined cells (red dots) are potential sub-basin outlets.

    16. Sub-Basins and Reach Network Modified reach segmentation. The user-defined outlets modify the reach segmentation by splitting the segments in which they are located.

    17. Sub-Basins and Reach Network Sub-basin delineation. The drainage area of each sub-basin outlet is delineated.

    18. Vectorization Streams and watersheds are converted from raster to vector format.

    19. Vectorization Adjacent watershed polygons can be merged into a single polygon, if they share the outlet or one flows into the other.

    20. Vectorization After merging sub-basin polygons, the attribute tables are modified so that the watershed code (WshCode) of the reaches and the area of the new sub-basin are updated.

    21. Hydrologic Parameters Flow length downstream to the sub-basin outlet.

    22. Hydrologic Parameters Flow length upstream to the sub-basin divide. A NODATA cell is defined at the sub-basin outlets before running the flow length function.

    23. Hydrologic Parameters Sub-basin longest flow-path. The longest flow-path is the geometric locus of the points for which the sum of both flow lengths is a maximum.

    24. Hydrologic Parameters Sub-basin lag-time according to the SCS formula:

    25. Hydrologic Parameters Sub-basin lag-time according to 0.6 L/v formula:

    26. Hydrologic Parameters Sub-basin parameters: Grid code, area (Km2), unit hydrograph model (SCS), length of longest flow path (m), slope of longest flow path (fraction), average curve number, lag-time (min), baseflow (none).

    27. Hydrologic Parameters Reach lag-time for Pure Lag routing:

    28. Hydrologic Parameters Reach lag-time and number of sub-reaches for Muskingum routing:

    29. Hydrologic Parameters Pure lag routing for Ls/60vs < Dt, otherwise Muskingum routing. Reach parameters: Grid code, sub-basin code, length(m), velocity (m/s), routing method (Lag or Muskingum), lag time (min), Muskingum X, Muskingum K (hr), number of sub-reaches.

    30. Hydrologic Sub-System Manual selection of sub-basin polygons

    31. Hydrologic Sub-System Manual selection of most downstream sub-basin polygon.

    32. Topologic Analysis HEC-HMS schematic in ArcView.

    33. Topologic Analysis HEC-HMS schematic in HMS.

    34. Topologic Analysis

    35. Overview Input Data for the HEC-HMS Basin Component Raster-Based Terrain Analysis Raster-Based Sub-Basin and Reach Network Delineation Vectorization of Sub-Basins and Reach Segments Computation of Hydrologic Parameters of Sub-Basins and Reaches Extraction of Hydrologic Sub-System Topologic Analysis Input Data for the HEC-HMS Precipitation Component User-Specified Gage Weighting GridParm

    36. User-Specified Gage Weighting Intersection of sub-basin polygons with gage Thiessen polygons.

    37. User-Specified Gage Weighting Precipitation in each sub-basin is calculated as a weighted average of the precipitation in the gages.

    38. User-Specified Gage Weighting Precipitation model in HEC-HMS

    39. GridParm Precipitation cells for modClark sub-basin routing.

    40. GridParm Precipitation cells for modClark sub-basin routing.

    41. Conclusions CRWR-PrePro pre-processes digital spatial data and produces input data for the HEC-HMS basin and precipitation components. CRWR-PrePro supports six of the seven hydrologic elements used in HEC-HMS. Within these elements it supports the SCS unit hydrograph for sub-basin routing, pure lag and Muskingum for reach routing, curve number and initial-plus-constant for precipitation excess calculations. CRWR-PrePro supports the user-specified-gage-weighting and GridParm for spatial interpolation of precipitation data.

    42. Basin File Watershed Parameters

    43. Basin File Watershed Parameters

    44. Basin File Stream Parameters

    45. Precipitation File

    46. Control File

    47. Hydrograph Time Table

    48. Hydrograph Summary

    49. Hydrograph Plot

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