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SWMM 5 Weir RTC Rules
Subject:   SWMM 5 Weir RTC Rules

This example SWMM 5 model closes a weir based on the depth at the upstream node of the Weir every 0.25 feet.  You can see the effect of the RTC rules using a Scatter plot of Weir Flow versus Weir Depth in SWMM 5 (Figure 1).   The Weir flows normally every 0.25 feet but shuts down three times using these rules which set the Weir Setting to 0.0

RULE Weir100IF Node  WeirNode Depth > 1.75AND Node WeirNode Depth < 2.0THEN WEIR WEIR Setting = 0.0Priority 2 RULE Weir101IF Node  WeirNode Depth > 2.25AND Node WeirNode Depth < 2.5THEN WEIR WEIR Setting = 0.0Priority 2 RULE Weir102IF Node  WeirNode Depth > 2.75AND Node WeirNode Depth < 3.0THEN WEIR WEIR Setting = 0.0Priority 2 RULE Weir103IF Node  WeirNode Depth > 3.25AND Node WeirNode Depth < 3.5THEN WEIR WEIR Setting = 0.0Priority 2 RULE Weir104IF Node  WeirNode Depth > 3.75AND Node WeirNode Depth < 4.0THEN WEIR WEIR Setting = 0.0Priority 2

Figure 1.  Scatter Graph of Weir flow versus Weir Node Depth.

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