FM Tute M02 ARC Pipe Network: Difference between revisions
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Tuflowduncan (talk | contribs) Created page with "<ol> =Introduction= This page describes the method for using ArcGIS to create the GIS based layers representing the pipe network. Two layers will be created each representing..." |
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=Method=
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<li>Copy the GIS layers '''1d_nwk_M07_Pipes_001_L.shp''' and '''1d_nwk_M07_Pits_001_P.shp''' within '''Module_data\Module_07\Pipe_Network''' into the '''TUFLOW\model\gis''' folder.
<li>Open the layer '''1d_nwk_M07_Pipes_001_L.shp''' in ArcGIS. This contains polylines representing the culverts that make up the pipe network.
<li>A number of the attributes within the '''1d_nwk_M07_Pipes_001_L''' layer have not been populated. Using the 'Calculate Field' toolset, update all objects with the following attributes, leaving all other attributes unchanged. An example of populating the 'Calculate Field' toolset was previously presented when updating the [[FM_Tute_M02_ARC_Define_Roughness|2d_mat files]].
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<br>
The attributes are described fully in Table
*The 1d_nwk type. In this case, we have specified culverts with a circular shape.
*The Manning’s n value of the culvert.
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*The number of identical pipes in parallel.
<li>Open the layer '''1d_nwk_M07_Pits_001_P''' in ArcGIS. This contains digitised points that represent the pits of the pipe network through which water can transfer to and from the overlying floodplain.
<li>A number of the attributes within the '''1d_nwk_M07_Pits_001_P''' layer have not been populated. Using the 'Calculate Field' toolset, update all objects with the following attributes, leaving all other attributes unchanged. An example of populating the 'Calculate Field' toolset was previously presented when updating the [[FM_Tute_M02_ARC_Define_Roughness|2d_mat files]].
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*AB is the name of the pit inlet type referenced within the pit database.
*Specifying SXL for the ‘Conn_2D’ attribute automatically creates a 2D SX connection at the 2D cell within which the 1D pit is located. In addition, the ZC elevation of the cell will be lowered by the amount specified in the ‘US_Invert’ attribute (0.1m), and the upstream invert of the pit channel set to the lowered 2D cell elevation. This is useful to help trap the water into the pit as it flows overland in the 2D domain. <br>
<li> Open the layer '''1d_nwk_M04_channels_001_L''' created in [[Tutorial Module04|Module 4]]. Note that the pipe network has been digitised to outfall to the watercourse which is represented in the Flood Modeller network. We need to manually specify the downstream invert levels of Pipe16 and Pipe18 as the discharge point of the pipe network is above the bed level of the watercourse. Make the layer '''1d_nwk_M07_Pipes_001_L''' editable and within the attribute table change the ‘DS_Invert’ attribute for both Pipe16 and Pipe18 from -99,999 to 38m.<br>
<li> Save the layer '''1d_nwk_M07_Pipes_001_L'''<br>
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[[File:M07 pit inlet dbase.png]]<br>
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<li>Open the '''pit_inlet_curves.csv''' file. This contains the depth-discharge curves for each pit inlet type which are referenced within the Pit Inlet Database. The curve for pit inlet type AB will be applied to all pits within this tutorial model. </ol><br>
[[File:M07 depth discharge.png|800px]]
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