TUFLOW 1D Channels and Hydraulic Structures: Difference between revisions

 

== How can trash screens be represented? ==

 

Where the screen is attached directly to the culvert inlet or outlet, the losses are applied to the culvert itself. For screens located upstream or downstream of the culvert, a short zero length channel is used to represent the screen. In both cases, the net flow area should be reduced to account for the bars and any debris blockage, either by adjusting the flow area directly or by using the %blockage option.

 

{| class="wikitable"

! style="text-align:center;" | Case

! EntryC_or_WSa

! ExitC_or_WSb

|-

| style="text-align:center;" | '''A''' || Upstream of culvert inlet || Zero length RF channel before culvert || Set to net flow area (or use %blockage) || ''K_t*'' || style="text-align:center;" | — || 0.0 (or 0.001)

|-

| style="text-align:center;" | '''B''' || At culvert inlet || Losses/blockage applied to culvert || Set to net flow area (or use %blockage) || ''K_t'' (if ''K_t'' > ''K_e'') || 0.0 (or 0.001) || style="text-align:center;" | —

|-

| style="text-align:center;" | '''C''' || Clean screen at outlet || Zero length RF channel after culvert || Set to net flow area (or use %blockage) || ''C_d A_r'' (''C_d'' ≈ 1.5 round, 1.9 rectangular) || style="text-align:center;" | — || ''K_exit''

|-

| style="text-align:center;" | '''D''' || Partially blocked screen at outlet || Zero length RF channel after culvert || Set to net flow area (or use %blockage) || ''K_t*'' || style="text-align:center;" | — || 1.0

|-

| style="text-align:center;" | '''E''' || Downstream of outlet || Zero length RF channel after culvert || Set to net flow area (or use %blockage) || ''K_t*'' || style="text-align:center;" | — || ''K_exit''

|}