## Wednesday, August 7, 2013

### 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 Weir100
IF Node  WeirNode Depth > 1.75
AND Node WeirNode Depth < 2.0
THEN WEIR WEIR Setting = 0.0
Priority 2

RULE Weir101
IF Node  WeirNode Depth > 2.25
AND Node WeirNode Depth < 2.5
THEN WEIR WEIR Setting = 0.0
Priority 2

RULE Weir102
IF Node  WeirNode Depth > 2.75
AND Node WeirNode Depth < 3.0
THEN WEIR WEIR Setting = 0.0
Priority 2

RULE Weir103
IF Node  WeirNode Depth > 3.25
AND Node WeirNode Depth < 3.5
THEN WEIR WEIR Setting = 0.0
Priority 2

RULE Weir104
IF Node  WeirNode Depth > 3.75
AND Node WeirNode Depth < 4.0
THEN WEIR WEIR Setting = 0.0
Priority 2

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