Converting a NEXRAD Rainfall Map into a Flood Inundation Map by ...

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In ArcMap open the attribute table of the CrossSection feature class and add afield called “RASCode.” Populate the field RASCode, for those cross sectionrepresenting flow change points (hydrograph entry points) with the completemodeling identifier name given in HEC-RAS and corresponding to theconcatenation of the StreamID, Reach ID, and Station identifiers separated by acomma.5.9 Building the HydroJunctionHasWatershed RelationshipThe JunctionID field in the Watershed feature class must be populated with theHydroID of the HydroJunction representing its outlet. By means of this fieldassociation the relationship class “HydroJunctionHasWatershed” can be built. Tobuild the relationship class the user may use standard functionality in ArcCatalog.5.10 Building the HydroJunctionHasSchematicNode RelationshipThe FeatureID field in the SchematicNode feature class is populated with theHydroID of the HydroJunction it represents. By means of this field association therelationship class “HydroJunctionHasSchematicNode” can be built. To build therelationship class the user may use standard functionality in ArcCatalog.5.11 Building the HydroJunctionHasCrossSection RelationshipThe JunctionID field in the Cross Section feature class needs to be populated withthe HydroID of the HydroJunction that is exchanging flow into a givendownstream cross section. By means of this field association the relationship class“HydroJunctionHasCrossSection” can be built. To build the relationship class theuser may use standard functionality in ArcCatalog.5.12 Copying the Time Series TablesThere are two time series tables in Arc Hydro, TimeSeries and TSType tables(created by the schema for you) that need to be in the Arc Hydro geodatabase foryour project. In addition to these two standard tables you need to have andadditional table to store the HEC-DSS descriptors called the DSSTSCatalog (orDSSTSType) so copy this table from the pilot Arc Hydro (located atC:\Map2Map\RosilloFull.mdb) into your Arc Hydro geodatabase.6 Get HRAP grid Polyline layer of the Study AreaUsing the HRAP layer for Texas (located atC:\Map2Map\RawNEXRAD_Data\NEXRADLayerTX) select only the NEXRAD210
cells that cover your study area and place it inside your ArcHydro geodatabase at“C:\Map2Map\RosilloFull.mdb\Hydrography\HydroResponseUnit.”7 Update the PixelID file listBased on the NEXRAD cells that overlay your study area you need to update thepixelID (six digit number) file list (PixelIDs.txt) located atC:\Map2Map\RawNEXRAD_Data. Make sure the PixelIDs for your study areaactually have rainfall data for them (not dry cells) in the hourly files located at“C:\Map2Map\RawNEXRAD_Data\NEXRAD_data” location.8 Generate Intersection between HRAP and Watershed PolygonsFor the “Time Series Transfer” script tool to work, a polygon layer that containsthe intersection of the NEXRAD cells and the Watersheds of the study area isneeded. Standard GIS functionality can be used to generate this layer (AnalysisTools > Overlay > Intersect hammer) which is called “IntRadWsh” in the pilot.Once it is generated place it in the Arc Hydro geodatabase at:“C:\Map2Map\RosilloFull.mdb\Hydrography.” Now you need to add four fieldsto your IntRadWsh layer: KEYFROM, KEYTO, PCTFROM, and PCTTO thefirst two as long integers and the last two as double type.9 Add HEC-HMS Model Setup for the Study AreaAdd the HEC-HMS project setup of your study area to the default directorylocation containing all the hydrologic HMS projects (C:\hmsproj). Your projectwill be placed at “C:\hmsproj\MyHMSProject.” Make sure the project is runningproperly when executed from the HMS user interface in stand-alone mode.10 Add HEC-RAS Model Setup for the Study AreaAdd the HEC-RAS project setup of your study area to the default directorylocation containing all the hydraulic RAS projects (C:\rasproj). Your project willbe placed at “C:\rasproj\MyRASProject”. Make sure the project is runningproperly when executed from the RAS user interface in stand-alone mode.11 Add the Digital Elevation Model (DEM) of the Floodplain AreaThe continuous surface representing the terrain elevations of your floodplain areais a vital piece of input for the final floodplain delineation phase. In order toobtain reasonable results, the resolution of the terrain raster must be high enoughto appropriately define places underwater. Regularly, the DEM must have a211
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Table of ContentsList of Figures ..
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4.1.12 The XML2GDB Script Tool ....
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Figure 3.24 Components of a Steady
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Figure 4.50 Create Flood Inundation
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Chapter 1 Introduction1.1 BACKGROUN
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for undeveloped or natural conditio
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All the previous statements favor t
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science, and engineering models as
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Different approaches have been used
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generic and self-described formats,
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externally executed from a central
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though GIS-based, the system does n
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Geographic Information Systems, Arc
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By defining the three basic functio
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containing an inventory of damage s
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Data Models in charge of storing an
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Figure 3.1 Floodplain Modeling Sche
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either with Schematic Nodes (for Su
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channel cross sections, available H
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sequential data, called pathnames,
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Figure 3.5 NEXRAD square cells (873
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geodatabase formatted with the Arc
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The CrossSection feature class in A
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geodatabase (under Arc Hydro format
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3.4.4 External Execution of HEC-RAS
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analysis. In particular, GIS has be
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3.5.3 Model-Specific ElementsA geog
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Figure 3.11 Geographic and Hydrolog
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For HEC-RAS, the connectivity is ac
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cross sections in the hydraulic mod
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Section line for a RAS cross-sectio
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from the geodatabase back into the
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Figure 3.19 Relationship Classes fo
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Figure 3.20 DSS Time Series content
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Figure 3.22 Extended Time Series Co
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Figure 3.23 Creating a Flow File fr
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etween the HEC-DSS file system and
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The more specific steps for the pos
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Chapter 4 Map2Map Components4.1 MOD
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A subset of NEXRAD time series data
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A folder location is also provided
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Figure 4.4 Radar2GDB Model Componen
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ecords. Figure 4.6 illustrates the
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Figure 4.8 Time Series Tables and R
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having different formats and that a
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Part E: Time Interval of stored dat
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execution time and for their corres
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on the steps needed to transfer the
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Len_sBTime (I): The length of the s
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52: Invalid precision exponent spec
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methods: user hyetograph, user gage
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Once the hyetograph is defined (for
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The resulting runoff hydrograph is
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Thus, the time period for the entir
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After the ZSRTS subroutine is execu
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Figure 4.12 HMSCaller Model Compone
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ased on a process handle (a program
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These simple command line statement
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To programmatically accomplish this
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to provide the hydraulic input for
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information into the extended Arc H
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The HydroJunction, used for connect
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Once the identification of flow cha
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As with the GDB2HMSDSS, the first t
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4.1.7 Time Series ExtractionOnce th
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accomplish this have been developed
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straight forward for all time stamp
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As opposed to HEC-DSS, the Arc Hydr
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Table 4.4: Variable Type Equivalenc
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ZCAT DSS subroutines) and stored in
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Table 4.5: Time Interval Equivalenc
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There are not specific valid values
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catalog list. For the DSS2GDB appli
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4.1.9.1 Opening the HEC-DSS fileThe
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channel (the hydraulic representati
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the model if the new configuration
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the main program as a public module
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Then, the RASCaller application acc
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Figure 4.31 ProjectName Property in
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Figure 4.33 RunSteady Method in RAS
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Figure 4.34 ExportGIS Method in RAS
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data structures delivered by every
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The two most well-known models for
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Page 231 and 232: Olsen R. J., Beling, P. A., Lambert
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Converting a NEXRAD Rainfall Map into a Flood Inundation Map by ...

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