Existing Irrigation
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Existing Irrigation

Tuesday, 21 July 2015
Video Length:  56:00
Presented By:  Jake Lott

At some point, every irrigation designer will need to add to or alter an existing system. This type of project can be among the most difficult. This week's webinar will cover a few different scenarios you might encounter as you design based on an existing irrigation system. – we'll show you some valuable tools, tricks, and tips. We'll also review graphic options on adding to or altering existing irrigation systems, including placing caps, adding custom POCs, and representing the effect of existing irrigated areas with our Schematic Irrigation tool.


Webinar Contents:

Note: The following catalog of content covered in this webinar is time stamped to allow you to follow along or skip to sections of the video that are relevant to your questions. You can also search for content on this page using the FIND command in your browser (CTRL + F in Windows, Command + F in Mac OS.)

  • Intro/TOC
  • Schematic Irrigation: Determining the Site's Pressure and Flow Requirements
  • Custom Points of Connection (POCs)
  • Caps
  • Adding New Valves to Existing Mainline
  • Using Reference Notes (RefNotes) to Show As-Builts

0:00 – 12:00: Intro/TOC

12:00 – 20:12: Schematic Irrigation: Determining the Site's Pressure and Flow Requirements

Using Schematic Irrigation to determine the required flows throughout the site (12:00)


Checking the necessary pipe size and determining whether pipe removal and replacement is necessary (13:45)


Colorizing the Schematic zones and printing – a great way to communicate to contractors and/or clients what needs to be done on the site (19:00)

20:13 – 23:59: Custom Points of Connection (POCs)

Selecting and placing a custom POC (20:13)


Placing valves around a zone and tying into the POC (21:55)


Sizing the existing mainline and laterals (22:30)

24:00 – 31:15: Caps

Adding and placing a cap (24:00)


Placing additional equipment, such as heads and valves (25:20)


Sending a PDF or Xref plan to the back in the draw order (26:00)


Connecting the new equipment to the existing system with lateral pipe (26:10)


Sizing the lateral pipes and piping to the cap (26:40)


Note that the cap is just a block with attributes in it. This means you can adjust its data as necessary by editing the attributes. (27:35)



Question: What if I don’t know the existing flow or precip rate? (28:20)

Answer:The software won’t be able to find this out. You’ll need to go to the site and, for example, read the meter and determine the average usage, drop in a flow sensor, etc. You can also start at the meter, take a reading, turn on the zone for 5 or 10 minutes (so it equalizes) and take the reading after that to determine the flow as the system equalizes.

31:16 – 44:59: Adding New Valves to an Existing Mainline

The importance of using Schematic Irrigation in the early stages (before placing your heads) (32:42)


Placing additional valves (34:00)


Piping to the existing system with mainline and lateral pipe (34:20)


Sizing the valves (34:45)


Determining the existing flow and locating the point of connection (POC) (35:00)


Showing the correct size of the existing POC (35:50)

Checking the Pipe Data (36:55)


Adjusting the flow velocity in the Pipe Data to mimic the size of the actual existing mainline (38:00)


Resizing the mainline to account for the new velocity, and checking the Critical Analysis (38:30)


Running a Watering Schedule on the existing system (40:45)


Adding a turf rotor and running the Watering Schedule again (41:50)


45:00 – end: Using Reference Notes (RefNotes) to Show As-Builts

Placing head and valve symbols in a blank drawing (45:43)


Copying and pasting a head or valve block into Paper Space (46:50)


Using the Save Block tool to save the block (48:00)


Creating a folder structure for this and other existing irrigation blocks (48:30)


Adding the new block as an Amenity RefNote (49:35)


Placing the existing equipment blocks (example: valves) throughout the system (51:00)


Using the Match Properties tool to copy more blocks of existing equipment, survey points, or equipment that requires replacement throughout the site (51:45)


Running a RefNotes Schedule to show all the existing equipment (52:20)



Note: The existing system is telling you what it needs in terms of pressure and flow. The software tells you want needs to happen for the system to function, allowing you to know the potential consequences if you don’t build in the flow and pressure the system will require. (55:00)

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