FM Tute M02 QGIS Pipe Network: Difference between revisions
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The attributes are described
*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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*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>
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<li> Open the layer '''1d_x1d_FMT_M01_nwk_001_P.shp''' created in [[Flood_Modeller_Tutorial_Module01 | Flood Modeller Tutorial 1]]. Note that the pipe network has been digitised to outfall to the watercourse represented within the Flood Modeller Network. We will 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. Use the Info tool and click on each pipe in turn and change the ‘DS_Invert’ attribute for both pipes from -99,999 to 38m.
<li>Save both '''1d_nwk_FMT_M02_Pipes_001_L.shp''' and '''1d_nwk_FMT_M02_Pits_001_P.shp'''. </li><br>
<u>'''Pit Inlet Database'''</u>
<li>The Pit Inlet Database has been created and can be found within '''Module_data\Module_02\Pipe_Network'''. Copy the csv files '''pit_inlet_curves.csv''' and '''pit_inlet_dbase.csv'''’ into a new folder entitled '''pit_dbase''' within the TUFLOW folder.
<li>Open the '''pit_inlet_dbase.csv''' file. The Pit Inlet Database is similar to the Boundary Condition Database in that it references an external source file and relates this to corresponding GIS objects within the model. <br>
The first column contains the name of pit inlet type as referenced in the Inlet_Type attribute that was specified within the '''1d_nwk_FMT_M02_Pits_001_P''' layer. The second column contains the name of the source .csv file that contains the depth-discharge curve. The third and fourth columns are the heading labels of the depth and discharge columns respectively in the source .csv file. The fifth and sixth columns are the inlet’s nominated full flow area in m<sup>2</sup> and flow width in m.
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[[File:M07 pit inlet dbase.png]]<br>
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=Conclusion=
1d_nwk layers have been created representing the culverts and pits that make the pipe network that of the proposed development. The layers have made use of an automated function to link the pits to the 2D domain to allow for the exchange of water between the pipe network and the floodplain. A Pit Inlet Database has been created to define a depth-discharge relationship at each pit. Please return to the main page of the[[
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