Revision as of 09:19, 23 September 2024 view source Emilie Nielsen (talk \| contribs) Administrators 6,425 edits No edit summary ← Older edit		Latest revision as of 08:41, 31 March 2026 view source Anne.Kolega (talk \| contribs) 434 edits e.g. Tag: Visual edit
Line 4: \|type=[[ERROR]] \|message_desc=Bridge structures are modelled using a height varying form loss coefficient rather than fixed contraction and expansion losses. A table (referred to as a BG Table) of backwater or form loss coefficient versus height is required for each bridge channel. BG Tables can be entered using .csv files via a 1d_tab (often renamed as 1d_bg) layer (see <u>[https://docs.tuflow.com/classic-hpc/manual/latest/ TUFLOW Manual]</u>).<br> Where the loss coefficient is constant through to the bridge deck (ege.g. no losses such as a clear spanning bridge, or pier losses only), the BG table can automatically be created by specifying a positive non-zero value for the Form_or_Bend_Loss attribute in the 1d_nwk layer (see <u>[https://docs.tuflow.com/classic-hpc/manual/latest/ TUFLOW Manual]</u>). Also note the use of this attribute in applying additional losses to a BG table.<br> As of 2010 TUFLOW build, fixed field format inputs are no longer supported. Prior to build 2010, these losses could be applied in fixed field format. \|suggestions=Ensure that each bridge channel has a BG table specified either via a 1d_tab layer, or via a fixed coefficient in the 1d_nwk layer. Check that fixed field losses are not being used, as these may be ignored in later versions of TUFLOW.

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