FM Tutorial M02 QGIS SHP Pipe Network: Difference between revisions
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Created page with "<ol> =Introduction= This page describes the method for using QGIS to create the GIS based layers representing the pipe network. Two layers will be created each representing t..." |
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The attributes are described completely in
*The 1d_nwk type. In this case, we have specified culverts with a circular shape.
*The Manning’s n value of the culvert.
*The upstream invert level of the pipes. When -99,999 is specified, the invert level will be taken from a manually created node or pit at the upstream end of the culvert. Refer to the next steps in this module which describe where these inverts will be defined by creating pits.
*The downstream invert level of the pipes. The same rules as for the upstream invert applies when specifying -99,999.
*The number of identical pipes in parallel. <br>
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Note that although the same layer (1d_nwk) has been used to define the pits of the pipe network as for the culverts, different attributes have been populated. Refer to
<u>[https://docs.tuflow.com/classic-hpc/manual/2025.1/OneD-Domains-1.html#tab:tab-CulvertsAttributeDescriptions Table 5.5]</u> and <u>[https://docs.tuflow.com/classic-hpc/manual/2025.1/OneD-Domains-1.html#tab:tab-PitsModelNetwork Table 5.24]</u> of the TUFLOW Manual for further information on how the attributes of the 1d_nwk layer differ between nodes and channels. The attributes that we have populated for the pits, define:<br>
*The type of pit channel. In this case, a type ‘Q’ specifies the flow is to be defined by a depth-discharge curve from a user defined database. This database will be created in the next steps of this module.
*AB is the name of the pit inlet type referenced within the pit database.
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=Conclusion=
<br>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
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