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

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Figure 4.46 TIN to Raster Model Component4.1.13.2 Extract by MaskBefore the depth of water in the floodplain can be mapped, the rastersurface of water elevations must be made consistent (same cell size and spatialextent) with the existing DTM of the floodplain under analysis. Due to thebounded extent of the first generated TIN of water surfaces, the raster obtainedfrom the previous process also goes beyond the spatial extent of the floodplainand interpolates water surface elevation values over outlying areas that are notaccurate or reliable (areas of non existing contour lines). To avoid this, the watersurface raster is clipped to the extent of the floodplain (main channel plus lateraloverbanks) being described by using a mask (a unit value raster) with the desiredspatial extent, the Boundary layer of the floodplain under study. This layer is partof the pre-processing phase and may consist of a polygon obtained by joining theend edges of all the HEC-RAS cross sections.170
By doing this, the water surface elevations assigned to each cross sectioncan be represented by a continuous surface having the same cell size and spatialextent of the DEM. The ModelBuilder schematic for clipping the water surfacegrid based on the “Extract by Mask” standard tool is shown in Figure 4.47.Figure 4.47 Extract by Mask Geoprocess ComponentUp to this point, the Cross Section layer in Map2Map, populated withhydraulic water surface elevations from HEC-RAS, has been used to generate agrid model of water surface elevations that is consistent (same extent andresolution) with the terrain elevation grid model. The concept of thistransformation is shown in Figure 4.48.171
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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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Page 131 and 132: 4.1.7 Time Series ExtractionOnce th
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Page 139 and 140: Table 4.4: Variable Type Equivalenc
Page 141 and 142: ZCAT DSS subroutines) and stored in
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Page 149 and 150: 4.1.9.1 Opening the HEC-DSS fileThe
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Page 159 and 160: Figure 4.31 ProjectName Property in
Page 161 and 162: Figure 4.33 RunSteady Method in RAS
Page 163 and 164: Figure 4.34 ExportGIS Method in RAS
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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 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
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Page 205 and 206: 5.6 A TRUE SPATIAL APPROACHAutomate
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Page 213 and 214: The first step consists in installi
Page 215 and 216: 3.7 Map2Map UsageAll of the model b
Page 217 and 218: Congratulations! You have successfu
Page 219 and 220: Once the simplified version of Arc
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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
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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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Converting a NEXRAD Rainfall Map into a Flood Inundation Map by ...

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