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

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The origin of the SDF file goes back to the first version of the HEC-GeoRAS interface (v.3.1) which was first developed in 1996 as an extension forArcView 3.2. It provides a set of procedures, tools, and utilities for thepreparation of GIS data for import into RAS and generation of GIS data fromRAS output (USACE, 2002a).HEC-RAS writes the export file with the RASexport.sdf file extension (forHEC-GeoRAS to generate GIS data from RAS output) and the informationcontent of the SDF file can be migrated into GIS for further spatial manipulations,analysis, and presentations. For HEC-RAS to be able to generate an SDF file thegeometry of the RAS project must be fully georeferenced. Two conditions need tobe met for a geometry component to be georeferenced:• All reaches must have an X-Y vertex definition• All cutlines (plan view representation of cross sections) must have anX-Y vertex definitionThus, if the HEC-RAS project is fully georeferenced (normally the casewhen the RAS input is created from GIS data) its output can be exported into anSDF file for GIS ingestion. The ExportGIS subroutine of the HECRASControlleris the method invoked by the RASCaller application to generate theRASexport.sdf file containing the hydraulic output information. Figure 4.34depicts the signature of the ExportGIS method.152
Figure 4.34 ExportGIS Method in RAS LibraryFinally, once HEC-RAS has been executed and its output transferred intoa “GIS compatible” format, the application uses the Quit method to save theproject and exit the HEC-RAS application. The signature of the subroutine isshown in Figure 4.35.153
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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
Page 111 and 112: After the ZSRTS subroutine is execu
Page 113 and 114: Figure 4.12 HMSCaller Model Compone
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Page 119 and 120: To programmatically accomplish this
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Page 125 and 126: The HydroJunction, used for connect
Page 127 and 128: Once the identification of flow cha
Page 129 and 130: As with the GDB2HMSDSS, the first t
Page 131 and 132: 4.1.7 Time Series ExtractionOnce th
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Page 137 and 138: As opposed to HEC-DSS, the Arc Hydr
Page 139 and 140: Table 4.4: Variable Type Equivalenc
Page 141 and 142: ZCAT DSS subroutines) and stored in
Page 143 and 144: Table 4.5: Time Interval Equivalenc
Page 145 and 146: There are not specific valid values
Page 147 and 148: catalog list. For the DSS2GDB appli
Page 149 and 150: 4.1.9.1 Opening the HEC-DSS fileThe
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Page 157 and 158: Then, the RASCaller application acc
Page 159 and 160: Figure 4.31 ProjectName Property in
Page 161: Figure 4.33 RunSteady Method in RAS
Page 165 and 166: data structures delivered by every
Page 167 and 168: The two most well-known models for
Page 169 and 170: The water surface elevations obtain
Page 171 and 172: Once the water surface elevations f
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Page 175 and 176: Figure 4.42 2 Foot-Contour Lines fo
Page 177 and 178: Figure 4.43 Rosillo Creek’s terra
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Page 181 and 182: By doing this, the water surface el
Page 183 and 184: Figure 4.49 Create Flood Polygon Mo
Page 185 and 186: Int OperationThe Integer operation
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Page 189 and 190: contours (isohyetals) or by interpo
Page 191 and 192: design storm input given its possib
Page 193 and 194: Figure 4.55 Workflow for Extracting
Page 195 and 196: for it. Finally, the DigitalStorm2H
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Page 199 and 200: Hydro, the HydroJunctionHasCrossSec
Page 201 and 202: involved in the transformation of r
Page 203 and 204: process model in sequence. For the
Page 205 and 206: 5.6 A TRUE SPATIAL APPROACHAutomate
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Page 209 and 210: value of the entire runoff hydrogra
Page 211 and 212: case study. Bigger watersheds (abov
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The first step consists in installi
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3.7 Map2Map UsageAll of the model b
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Congratulations! You have successfu
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Once the simplified version of Arc
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cells that cover your study area an
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Second, the user needs to modify th
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Appendix BMap2Map CD Content1 CD Da
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o hmsproj - contains folders with H
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Goodchild, M.F., Steyaert, L.T., an
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Olsen R. J., Beling, P. A., Lambert
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Werner, M. G. F. 2001. Impact of gr
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