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

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The HydroEdge feature class must have a flow direction assigned to it by usingstandard ArcHydro tools to assign and store the flow directions.5.1 Applying the Schema (Arc Hydro Framework)Following standard Arc Hydro procedures the user is encourage to apply thesimplified schema to the created geodatabase to provide it with necessary fields tobe later populated like HydroIDs and JuntionsIDs.5.2 Generating the Geometric NetworkThe user need to create an Arc Hydro Geometric Network based on the previousHydro Edge and Hydro Junction feature classes that match the HEC-HMStopology. ArcCatalog is used for creating the geometric network by right clickingon the feature dataset containing the involved feature classes (Network featuredataset) and selecting the New > Geometric Network options as shown below andthen following the wizard.5.3 Generating the SchematicNetworkAfter the geometric network has been created a schematic version of it needs to begenerated to match the hydrologic setup in HEC-HMS. Under the Network Toolsmenu in the ArcHydro toolbar you may generate a SchematicNetwork by usingthe “Node/Link Schema Generation” option in the Arc Hydro toolbar.208
Once the simplified version of Arc Hydro (the Framework) has been developedfor the study area the user needs to place it at the right Map2Map location for laterreference. The Map2Map folder location is: “C:\Map2Map\MyArcHydro.mdb.”5.4 Populating HydroID and JunctionID fieldsUsing the Arc Hydro toolbar the user must assign HydroIDs to HydroEdge,HydroJunction, and Watershed feature classes as well as JunctionIDs to theWatershed feature class.5.5 Populating NextDownID fieldUsing the Arc Hydro toolbar (Attribute Tools > Find Next Downstream Junction)the user must assign NextDownIDs to the HydroJunction feature class and doublecheck that the geographic topology matches the hydrologic topology in HMS.5.6 Populating the SchematicNode Feature with HMSCodesIn ArcMap open the attribute table of the SchematicNode feature class and add atext field called “HMSCode.” Populate the field HMSCode for those nodesrepresenting flow change points (hydrograph entry points) with the exactmodeling name given in HEC-HMS which also corresponds to the B part in HEC-DSS pathnames.5.7 Populating the Watershed Feature with HMSCodesIn ArcMap open the attribute table of the Watershed feature class and add a textfield called “HMSCode.” Populate the field HMSCode for all the subbasins withthe exact modeling name given in HEC-HMS. This way Map2Map will generatea meteorologic file with hyetographs for each subbasin.5.8 Populating the CrossSection Feature with RASCodes209
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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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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 193 and 194: Figure 4.55 Workflow for Extracting
Page 195 and 196: for it. Finally, the DigitalStorm2H
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Page 201 and 202: involved in the transformation of r
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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
Page 213 and 214: The first step consists in installi
Page 215 and 216: 3.7 Map2Map UsageAll of the model b
Page 217: Congratulations! You have successfu
Page 221 and 222: cells that cover your study area an
Page 223 and 224: Second, the user needs to modify th
Page 225 and 226: Appendix BMap2Map CD Content1 CD Da
Page 227 and 228: o hmsproj - contains folders with H
Page 229 and 230: Goodchild, M.F., Steyaert, L.T., an
Page 231 and 232: Olsen R. J., Beling, P. A., Lambert
Page 233 and 234: Werner, M. G. F. 2001. Impact of gr
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Converting a NEXRAD Rainfall Map into a Flood Inundation Map by ...

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