Placing point of connection objects

The Point of Connection tool places a Point of Connection (POC) object, which represents the source of water for the irrigation system. Normally, there is only one POC for the system. There are two types of POC: service line and custom. A service line has a known and predictable static pressure value. Custom types of POC include pumps and cisterns or other types of water sources.

1. Click the tool, and then click Point of Connection on the Tool bar. From the Resource Selector, double-click a resource to activate it. Select from one of the point of connection libraries, or select a custom resource from Custom POCs.vwx and set its properties after placement.

The Object Properties dialog box opens. Select the default POC settings. The Point of Connection tool uses these preferences until they are changed again.

Parameter	Description
POC Name	Names the object, which is useful for labels, irrigation schedules, and other worksheets. Since a POC is designated for use with the Design Zone tool, it is useful to provide a name for the POC object, especially when there is more than one POC for the site.
Note	Adds a note about the object, which is useful for labels, irrigation schedules, and other worksheets, and also for making notes when saving red symbol definitions
Graphics
Symbol Name	Displays the name of the symbol used to represent the POC; <default symbol> indicates that the default POC symbol is used
Replace Symbol	Selects a different POC symbol; choose the symbol from the appropriate category
Symbol Scale	Scales the symbol with respect to the layer scale by the specified scale factor; a factor of less than one decreases the size of the symbol, while a factor of more than one increases its size
Show Pressure	Places a pressure label on the drawing
Show Flow	Places a flow rate label on the drawing

3. Click once to place the POC. If placing the POC over an existing pipe or irrigation pipe network, the connecting pipe is highlighted and the POC is automatically connected to the network.

The POC properties can be edited from the Object Info palette. Available parameters depend on the POC type.

Parameter	Description
Save Point of Connection	Saves the selected POC as a red symbol definition in the active file; this would typically be done for a POC with modified data
POC Name	Specifies the POC name, which is useful for labels, irrigation schedules, and other worksheets. Since a POC is designated for use with the Design Zone tool, it is useful to provide a name for the POC object, especially when there is more than one POC for the site.
Note	Adds a note about the object, which is useful for labels, irrigation schedules, and other worksheets, and also for making notes when saving red symbol definitions
Water Source Type	Indicates whether the POC originates from a service line or from a custom water source
Display in Drawing	Select either Design Information or Calculated Information to affect the display of all calculated values and coverage zones in the drawing; see Concept: Design and calculation parameters for irrigation
Design Information	The POC must be connected to display information
Required Pressure	Specifies the pressure required to operate the zone with the greatest designed pressure requirements
Pressure Differential	Specifies the additional pressure in the designed system once the required pressure has been considered Pressure differential = output pressure - required pressure
Greatest Zone Flow	Indicates the flow rate needed to operate the zone with the greatest designed pressure requirements
Flow Differential	Reports the additional available flow rate in the designed system once the required flow has been considered Flow differential = max safe flow - greatest zone flow
Calculated Information	The POC must be connected to display information
Output Pressure	Displays the amount of pressure produced by the POC, depending on the data, and therefore, the water source type
Greatest Zone Flow	Indicates the flow rate needed to operate the zone with the greatest pressure requirements
Flow Differential	Reports the additional available flow rate in the system once the required flow has been considered Flow differential = max safe flow - greatest zone flow
Data
Output Pressure (custom water source)	Enter the amount of pressure produced by the POC at all times
Max Safe Flow (custom water source)	Specify the maximum flow rate safely provided by the POC
Source Static Pressure (service line water source)	Enter the pressure in the pipes arriving from the water service provider
Service Line Type (service line water source)	Select the type of service line that runs from the water supply pipe to the irrigation system
Service Line Size (service line water source)	Select the service line size that can safely be provided by the service line
Service Line Length (service line water source)	Enter the length of the service line from the source to the POC
Service Line Max Velocity (service line water source)	Enter the maximum velocity provided by the service line
Source Elevation Change (service line water source)	Specify the change in elevation from the water source to the POC; if positive, the POC is higher in elevation than the source
Water Meter (service line water source)	When a water meter is attached to the service line between the source and the POC, select this option and specify the water meter size
Water Meter Size (service line water source)	Select the size of the water meter from the list, or select Edit List to access the catalog of water meter sizes; see Concept: Using the irrigation catalog
Comment	Adds an informational note to the catalog data
Output (service line water source)
Line Pressure Loss	Displays the pressure loss for the service line, as determined by the service line type, size, length, and max flow
Elevation Pressure Change	Displays the pressure change due to elevation differences, based on the Source Elevation Change parameter
Meter pressure loss (water meter)	When a water meter is attached, displays the calculated pressure loss, based on the size of the water meter and the Max Safe Flow
Additional Pressure Loss	Enter any additional pressure loss to be included in the Output Pressure calculation
Output Pressure	Displays the calculated pressure produced by the POC, after modifying the Source Static Pressure by considering values specified or calculated in Line Pressure Loss, Elevation Pressure Change, Meter pressure loss, and any Additional Pressure Loss
Service Line Max Flow (water meter)	Displays the maximum flow at which the Service Line Velocity does not exceed the Service Line Max Velocity
Water Meter Max Flow (water meter)	Displays the maximum flow rate for the water meter, as determined based on the Water Meter Size and the Source Static Pressure values
Max Safe Flow	Displays the calculated flow rate safely provided by the POC. When there is no water meter, this value represents the maximum flow at which the service line velocity does not exceed the maximum velocity set for the service line. When a water meter is present, displays the lesser value of either the Service Line Max Flow or the Water Meter Max Flow.
Service Line Velocity	Displays the calculated velocity of the service line, based on Max Safe Flow, Service Line Type and Service Line Size
Graphics
Symbol Name	Displays the name of the symbol used to represent the POC; <default symbol> indicates that the default POC symbol is used
Replace Symbol	Selects a different POC symbol; choose the symbol from the appropriate category
Symbol Scale	Scales the symbol with respect to the layer scale by the specified scale factor; a factor of less than one decreases the size of the symbol, while a factor of more than one increases its size
Attach Tag/Label	Automatically attaches a Tag/Label object to the object. The last selected tag/label for the object type is applied; click the tag/label to edit its properties (see Adding labels to irrigation objects).
Show Pressure	Places a pressure label on the drawing
Show Flow	Places a flow rate label on the drawing